GEOS-Chem horizontal grids: Difference between revisions
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On this page we provide information about the horizontal grids used by GEOS-Chem "Classic" simulations. | On this page we provide information about the horizontal grids used by GEOS-Chem "Classic" simulations. For information about the vertical coordinates used by GEOS-Chem, please see our [[GEOS-Chem vertical grids|''GEOS-Chem vertical grids'' wiki page]]. | ||
== | == Overview == | ||
If you are running GEOS-Chem in "Classic" mode (i.e. without the ESMF library and MPI parallelization), then you may use any of the Cartesian ("lat-lon") grids that are listed below for your simulations. | |||
''NOTE: This applies to GEOS-Chem versions prior to 12.4.0:'' GEOS-Chem stores horizontal grid information in the source code module <code>GeosUtil/gc_grid_mod.F90</code> (formerly known as <code>GeosUtil/grid_mod.F90</code>. You may call several of the routines of <code>gc_grid_mod.F90</code> to return the horizontal coordinates of a grid box given the grid box indices. | |||
Our HPC-enabled version of GEOS-Chem (aka GCHP) can read input data on cubed-sphere grids. For more information, please see [[GEOS-Chem HP|our ''GEOS-Chem HP'' wiki page]]. | |||
- | |||
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 21:35, 29 November 2016 (UTC) | |||
=== FlexGrid: a new way to specify GEOS-Chem traditional and custom grids === | |||
The FlexGrid feature will be implemented into [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]] and later versions. FlexGrid allows you to specify the traditional GEOS-Chem grid definitions (listed below), as well as custom grids, at runtime. It will no longer be necessary to recompile GEOS-Chem if you want to switch from one grid to another. | |||
For more information about FlexGrid, please see [[FlexGrid|our ''FlexGrid'' wiki page]]. | |||
--[[User:Bmy|Bob Yantosca]] ([[User talk:Bmy|talk]]) 15:05, 30 May 2019 (UTC) | |||
== Traditional GEOS-Chem grid definitions == | |||
The "traditional" GEOS-Chem global and nested grid definitions are listed below. | |||
=== GMAO 4 x 5 grid === | |||
[[FlexGrid#4.C2.B0_x_5.C2.B0_global_grid|This grid may be specified via FlexGrid with these settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | |||
[[File:grid_gmao4x5.png]] | |||
GMAO 4° x 5° longitude centers: | GMAO 4° x 5° longitude centers: | ||
-180.000 -175.000 -170.000 -165.000 -160.000 -155.000 -150.000 -145.000 -140.000 -135.000 -130.000 -125.000 -120.000 -115.000 | -180.000 -175.000 -170.000 -165.000 -160.000 -155.000 -150.000 -145.000 | ||
-140.000 -135.000 -130.000 -125.000 -120.000 -115.000 -110.000 -105.000 | |||
-100.000 -95.000 -90.000 -85.000 -80.000 -75.000 -70.000 -65.000 | |||
-60.000 -55.000 -50.000 -45.000 -40.000 -35.000 -30.000 -25.000 | |||
100.000 105.000 110.000 115.000 120.000 125.000 130.000 135.000 | -20.000 -15.000 -10.000 -5.000 0.000 5.000 10.000 15.000 | ||
20.000 25.000 30.000 35.000 40.000 45.000 50.000 55.000 | |||
60.000 65.000 70.000 75.000 80.000 85.000 90.000 95.000 | |||
100.000 105.000 110.000 115.000 120.000 125.000 130.000 135.000 | |||
140.000 145.000 150.000 155.000 160.000 165.000 170.000 175.000 | |||
GMAO 4° x 5° latitude | GMAO 4° x 5° latitude centers: | ||
-89.000 -86.000 -82.000 -78.000 -74.000 -70.000 -66.000 -62.000 | |||
-58.000 -54.000 -50.000 -46.000 -42.000 -38.000 -34.000 -30.000 | |||
-26.000 -22.000 -18.000 -14.000 -10.000 -6.000 -2.000 2.000 | |||
6.000 10.000 14.000 18.000 22.000 26.000 30.000 34.000 | |||
38.000 42.000 46.000 50.000 54.000 58.000 62.000 66.000 | |||
70.000 74.000 78.000 82.000 86.000 89.000 | |||
=== GMAO 2 x 2.5 grid === | |||
[[FlexGrid#2.C2.B0_x_2.5.C2.B0_global_grid|This grid may be specified via FlexGrid with these settings]] (for GEOS-Chem 12.4.0 and later). | |||
[[File:grid_gmao2x25.png]] | [[File:grid_gmao2x25.png]] | ||
GMAO 2° x 2.5° longitude centers: | GMAO 2° x 2.5° longitude centers: | ||
-180.000 -177.500 -175.000 -172.500 -170.000 -167.500 -165.000 -162.500 -160.000 -157.500 -155.000 -152.500 -150.000 -147.500 | -180.000 -177.500 -175.000 -172.500 -170.000 -167.500 -165.000 -162.500 | ||
-160.000 -157.500 -155.000 -152.500 -150.000 -147.500 -145.000 -142.500 | |||
-140.000 -137.500 -135.000 -132.500 -130.000 -127.500 -125.000 -122.500 | |||
-120.000 -117.500 -115.000 -112.500 -110.000 -107.500 -105.000 -102.500 | |||
-40.000 -37.500 -35.000 -32.500 -30.000 -27.500 -25.000 -22.500 | -100.000 -97.500 -95.000 -92.500 -90.000 -87.500 -85.000 -82.500 | ||
-80.000 -77.500 -75.000 -72.500 -70.000 -67.500 -65.000 -62.500 | |||
-60.000 -57.500 -55.000 -52.500 -50.000 -47.500 -45.000 -42.500 | |||
-40.000 -37.500 -35.000 -32.500 -30.000 -27.500 -25.000 -22.500 | |||
100.000 102.500 105.000 107.500 110.000 112.500 115.000 117.500 | -20.000 -17.500 -15.000 -12.500 -10.000 -7.500 -5.000 -2.500 | ||
0.000 2.500 5.000 7.500 10.000 12.500 15.000 17.500 | |||
20.000 22.500 25.000 27.500 30.000 32.500 35.000 37.500 | |||
40.000 42.500 45.000 47.500 50.000 52.500 55.000 57.500 | |||
60.000 62.500 65.000 67.500 70.000 72.500 75.000 77.500 | |||
80.000 82.500 85.000 87.500 90.000 92.500 95.000 97.500 | |||
100.000 102.500 105.000 107.500 110.000 112.500 115.000 117.500 | |||
120.000 122.500 125.000 127.500 130.000 132.500 135.000 137.500 | |||
140.000 142.500 145.000 147.500 150.000 152.500 155.000 157.500 | |||
160.000 162.500 165.000 167.500 170.000 172.500 175.000 177.500 | |||
GMAO 2° x 2.5° latitude centers: | GMAO 2° x 2.5° latitude centers: | ||
-89.500 -88.000 -86.000 -84.000 -82.000 -80.000 -78.000 -76.000 | -89.500 -88.000 -86.000 -84.000 -82.000 -80.000 -78.000 -76.000 | ||
-74.000 -72.000 -70.000 -68.000 -66.000 -64.000 -62.000 -60.000 | |||
-58.000 -56.000 -54.000 -52.000 -50.000 -48.000 -46.000 -44.000 | |||
-42.000 -40.000 -38.000 -36.000 -34.000 -32.000 -30.000 -28.000 | |||
22.000 24.000 26.000 28.000 30.000 32.000 34.000 36.000 | -26.000 -24.000 -22.000 -20.000 -18.000 -16.000 -14.000 -12.000 | ||
-10.000 -8.000 -6.000 -4.000 -2.000 0.000 2.000 4.000 | |||
6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 | |||
22.000 24.000 26.000 28.000 30.000 32.000 34.000 36.000 | |||
38.000 40.000 42.000 44.000 46.000 48.000 50.000 52.000 | |||
54.000 56.000 58.000 60.000 62.000 64.000 66.000 68.000 | |||
70.000 72.000 74.000 76.000 78.000 80.000 82.000 84.000 | |||
86.000 88.000 89.500 | |||
== GMAO | === GMAO 0.5 x 0.625 grid === | ||
This is the native resolution of the [[ | This is the native resolution of the [[MERRA-2]] reanalysis product from GMAO. | ||
The grid coordinates are constructed as follows: | |||
Lon_Center(I) = -180° + ( 0.625° * ( I - 1 ) ), I = 1, 576 | |||
Lat_Center(J) = -90° + ( 0.5° * ( J - 1 ) ), J = 1, 361 | |||
==== 0.5 x 0.625 AS nested grid ==== | |||
This is the [[MERRA-2]] native resolution nested grid over China and SE Asia. | |||
[[FlexGrid#0.5.C2.B0_x_0.625.C2.B0_nested_Asia|This grid may be specified with the following settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | |||
[[File:MERRA2_05x0625_AS.png]] | |||
0.5° x 0.625° AS longitude centers: | |||
60.000 60.625 61.250 61.875 62.500 63.125 63.750 64.375 | |||
65.000 65.625 66.250 66.875 67.500 68.125 68.750 69.375 | |||
70.000 70.625 71.250 71.875 72.500 73.125 73.750 74.375 | |||
75.000 75.625 76.250 76.875 77.500 78.125 78.750 79.375 | |||
80.000 80.625 81.250 81.875 82.500 83.125 83.750 84.375 | |||
85.000 85.625 86.250 86.875 87.500 88.125 88.750 89.375 | |||
90.000 90.625 91.250 91.875 92.500 93.125 93.750 94.375 | |||
95.000 95.625 96.250 96.875 97.500 98.125 98.750 99.375 | |||
100.000 100.625 101.250 101.875 102.500 103.125 103.750 104.375 | |||
105.000 105.625 106.250 106.875 107.500 108.125 108.750 109.375 | |||
110.000 110.625 111.250 111.875 112.500 113.125 113.750 114.375 | |||
115.000 115.625 116.250 116.875 117.500 118.125 118.750 119.375 | |||
120.000 120.625 121.250 121.875 122.500 123.125 123.750 124.375 | |||
125.000 125.625 126.250 126.875 127.500 128.125 128.750 129.375 | |||
130.000 130.625 131.250 131.875 132.500 133.125 133.750 134.375 | |||
135.000 135.625 136.250 136.875 137.500 138.125 138.750 139.375 | |||
140.000 140.625 141.250 141.875 142.500 143.125 143.750 144.375 | |||
145.000 145.625 146.250 146.875 147.500 148.125 148.750 149.375 | |||
150.000 | |||
0.5° x 0.625° AS latitude centers: | |||
-11.000 -10.500 -10.000 -9.500 -9.000 -8.500 -8.000 -7.500 | |||
-7.000 -6.500 -6.000 -5.500 -5.000 -4.500 -4.000 -3.500 | |||
-3.000 -2.500 -2.000 -1.500 -1.000 -0.500 0.000 0.500 | |||
1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 | |||
5.000 5.500 6.000 6.500 7.000 7.500 8.000 8.500 | |||
9.000 9.500 10.000 10.500 11.000 11.500 12.000 12.500 | |||
13.000 13.500 14.000 14.500 15.000 15.500 16.000 16.500 | |||
17.000 17.500 18.000 18.500 19.000 19.500 20.000 20.500 | |||
21.000 21.500 22.000 22.500 23.000 23.500 24.000 24.500 | |||
25.000 25.500 26.000 26.500 27.000 27.500 28.000 28.500 | |||
29.000 29.500 30.000 30.500 31.000 31.500 32.000 32.500 | |||
33.000 33.500 34.000 34.500 35.000 35.500 36.000 36.500 | |||
37.000 37.500 38.000 38.500 39.000 39.500 40.000 40.500 | |||
41.000 41.500 42.000 42.500 43.000 43.500 44.000 44.500 | |||
45.000 45.500 46.000 46.500 47.000 47.500 48.000 48.500 | |||
49.000 49.500 50.000 50.500 51.000 51.500 52.000 52.500 | |||
53.000 53.500 54.000 54.500 55.000 | |||
==== 0.5 x 0.625 EU nested grid ==== | |||
[[ | This is the [[MERRA-2]] native resolution nested grid over Europe. | ||
[[FlexGrid#0.5.C2.B0_x_0.625.C2.B0_nested_Europe|This grid may be specified via FlexGrid with these settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | |||
[[File:MERRA2_05x0625_EU.png]] | |||
0.5° x 0.625° EU longitude centers: | |||
-30.000 -29.375 -28.750 -28.125 -27.500 -26.875 -26.250 -25.625 | |||
- | -25.000 -24.375 -23.750 -23.125 -22.500 -21.875 -21.250 -20.625 | ||
- | -20.000 -19.375 -18.750 -18.125 -17.500 -16.875 -16.250 -15.625 | ||
- | -15.000 -14.375 -13.750 -13.125 -12.500 -11.875 -11.250 -10.625 | ||
- | -10.000 -9.375 -8.750 -8.125 -7.500 -6.875 -6.250 -5.625 | ||
- | -5.000 -4.375 -3.750 -3.125 -2.500 -1.875 -1.250 -0.625 | ||
- | 0.000 0.625 1.250 1.875 2.500 3.125 3.750 4.375 | ||
- | 5.000 5.625 6.250 6.875 7.500 8.125 8.750 9.375 | ||
- | 10.000 10.625 11.250 11.875 12.500 13.125 13.750 14.375 | ||
- | 15.000 15.625 16.250 16.875 17.500 18.125 18.750 19.375 | ||
- | 20.000 20.625 21.250 21.875 22.500 23.125 23.750 24.375 | ||
- | 25.000 25.625 26.250 26.875 27.500 28.125 28.750 29.375 | ||
30.000 30.625 31.250 31.875 32.500 33.125 33.750 34.375 | |||
35.000 35.625 36.250 36.875 37.500 38.125 38.750 39.375 | |||
40.000 40.625 41.250 41.875 42.500 43.125 43.750 44.375 | |||
45.000 45.625 46.250 46.875 47.500 48.125 48.750 49.375 | |||
50.000 | |||
0.5° x 0.625° EU latitude centers: | |||
30.000 30.500 31.000 31.500 32.000 32.500 33.000 33.500 | |||
34.000 34.500 35.000 35.500 36.000 36.500 37.000 37.500 | |||
38.000 38.500 39.000 39.500 40.000 40.500 41.000 41.500 | |||
42.000 42.500 43.000 43.500 44.000 44.500 45.000 45.500 | |||
46.000 46.500 47.000 47.500 48.000 48.500 49.000 49.500 | |||
50.000 50.500 51.000 51.500 52.000 52.500 53.000 53.500 | |||
54.000 54.500 55.000 55.500 56.000 56.500 57.000 57.500 | |||
58.000 58.500 59.000 59.500 60.000 60.500 61.000 61.500 | |||
62.000 62.500 63.000 63.500 64.000 64.500 65.000 65.500 | |||
66.000 66.500 67.000 67.500 68.000 68.500 69.000 69.500 | |||
70.000 | |||
==== 0.5 x 0.625 NA nested grid ==== | |||
This is the [[MERRA-2]] native resolution nested grid over North America. | |||
[[FlexGrid#0.5.C2.B0_x_0.625.C2.B0_nested_North_America|This grid may be specified via FlexGrid with these settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | |||
[[File:MERRA2_05x0625_NA.png]] | |||
0.5° x 0.625° NA longitude centers: | |||
-140.000 -139.375 -138.750 -138.125 -137.500 -136.875 -136.250 -135.625 | |||
-135.000 -134.375 -133.750 -133.125 -132.500 -131.875 -131.250 -130.625 | |||
-130.000 -129.375 -128.750 -128.125 -127.500 -126.875 -126.250 -125.625 | |||
-125.000 -124.375 -123.750 -123.125 -122.500 -121.875 -121.250 -120.625 | |||
-120.000 -119.375 -118.750 -118.125 -117.500 -116.875 -116.250 -115.625 | |||
-115.000 -114.375 -113.750 -113.125 -112.500 -111.875 -111.250 -110.625 | |||
-110.000 -109.375 -108.750 -108.125 -107.500 -106.875 -106.250 -105.625 | |||
-105.000 -104.375 -103.750 -103.125 -102.500 -101.875 -101.250 -100.625 | |||
-100.000 -99.375 -98.750 -98.125 -97.500 -96.875 -96.250 -95.625 | |||
-95.000 -94.375 -93.750 -93.125 -92.500 -91.875 -91.250 -90.625 | |||
-90.000 -89.375 -88.750 -88.125 -87.500 -86.875 -86.250 -85.625 | |||
-85.000 -84.375 -83.750 -83.125 -82.500 -81.875 -81.250 -80.625 | |||
-80.000 -79.375 -78.750 -78.125 -77.500 -76.875 -76.250 -75.625 | |||
-75.000 -74.375 -73.750 -73.125 -72.500 -71.875 -71.250 -70.625 | |||
-70.000 -69.375 -68.750 -68.125 -67.500 -66.875 -66.250 -65.625 | |||
-65.000 -64.375 -63.750 -63.125 -62.500 -61.875 -61.250 -60.625 | |||
-60.000 -59.375 -58.750 -58.125 -57.500 -56.875 -56.250 -55.625 | |||
-55.000 -54.375 -53.750 -53.125 -52.500 -51.875 -51.250 -50.625 | |||
-50.000 -49.375 -48.750 -48.125 -47.500 -46.875 -46.250 -45.625 | |||
-45.000 -44.375 -43.750 -43.125 -42.500 -41.875 -41.250 -40.625 | |||
-40.000 | |||
0.5° x 0.625° NA latitude centers: | |||
10.000 10.500 11.000 11.500 12.000 12.500 13.000 13.500 | |||
14.000 14.500 15.000 15.500 16.000 16.500 17.000 17.500 | |||
18.000 18.500 19.000 19.500 20.000 20.500 21.000 21.500 | |||
22.000 22.500 23.000 23.500 24.000 24.500 25.000 25.500 | |||
26.000 26.500 27.000 27.500 28.000 28.500 29.000 29.500 | |||
30.000 30.500 31.000 31.500 32.000 32.500 33.000 33.500 | |||
34.000 34.500 35.000 35.500 36.000 36.500 37.000 37.500 | |||
38.000 38.500 39.000 39.500 40.000 40.500 41.000 41.500 | |||
42.000 42.500 43.000 43.500 44.000 44.500 45.000 45.500 | |||
46.000 46.500 47.000 47.500 48.000 48.500 49.000 49.500 | |||
50.000 50.500 51.000 51.500 52.000 52.500 53.000 53.500 | |||
54.000 54.500 55.000 55.500 56.000 56.500 57.000 57.500 | |||
58.000 58.500 59.000 59.500 60.000 60.500 61.000 61.500 | |||
62.000 62.500 63.000 63.500 64.000 64.500 65.000 65.500 | |||
66.000 66.500 67.000 67.500 68.000 68.500 69.000 69.500 | |||
70.000 | |||
=== GMAO 0.25 x 0.3125 grid === | |||
This is the native resolution of the [[GEOS-FP|GEOS-5 "forward processing" (which we call GEOS-FP)]] operational data product from GMAO. | |||
The grid coordinates are computed as follows: | |||
1° | Lon_Center(I) = -180° + [ 0.3125° * ( I - 1 ) ], I = 1, 1152 | ||
Lat_Center(I) = -90° + [ 0.25° * ( J - 1 ) ], J = 1, 721 | |||
==== 0.25 x 0.3125 CH nested grid ==== | |||
[[File:GEOSFP_025x03125_CH.png]] | |||
This is | This is the [[GEOS-FP]] native-resolution nested-grid over China. | ||
[[ | [[FlexGrid#0.25.C2.B0_x_0.3125.C2.B0_nested_China|This grid may be specified via FlexGrid with these settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | ||
0.25° x 0.3125° CH longitude centers: | |||
70.0000 70.3125 70.6250 70.9375 71.2500 71.5625 71.8750 72.1875 | |||
72.5000 72.8125 73.1250 73.4375 73.7500 74.0625 74.3750 74.6875 | |||
75.0000 75.3125 75.6250 75.9375 76.2500 76.5625 76.8750 77.1875 | |||
77.5000 77.8125 78.1250 78.4375 78.7500 79.0625 79.3750 79.6875 | |||
80.0000 80.3125 80.6250 80.9375 81.2500 81.5625 81.8750 82.1875 | |||
82.5000 82.8125 83.1250 83.4375 83.7500 84.0625 84.3750 84.6875 | |||
85.0000 85.3125 85.6250 85.9375 86.2500 86.5625 86.8750 87.1875 | |||
87.5000 87.8125 88.1250 88.4375 88.7500 89.0625 89.3750 89.6875 | |||
90.0000 90.3125 90.6250 90.9375 91.2500 91.5625 91.8750 92.1875 | |||
92.5000 92.8125 93.1250 93.4375 93.7500 94.0625 94.3750 94.6875 | |||
95.0000 95.3125 95.6250 95.9375 96.2500 96.5625 96.8750 97.1875 | |||
97.5000 97.8125 98.1250 98.4375 98.7500 99.0625 99.3750 99.6875 | |||
100.0000 100.3125 100.6250 100.9375 101.2500 101.5625 101.8750 102.1875 | |||
102.5000 102.8125 103.1250 103.4375 103.7500 104.0625 104.3750 104.6875 | |||
105.0000 105.3125 105.6250 105.9375 106.2500 106.5625 106.8750 107.1875 | |||
107.5000 107.8125 108.1250 108.4375 108.7500 109.0625 109.3750 109.6875 | |||
110.0000 110.3125 110.6250 110.9375 111.2500 111.5625 111.8750 112.1875 | |||
112.5000 112.8125 113.1250 113.4375 113.7500 114.0625 114.3750 114.6875 | |||
115.0000 115.3125 115.6250 115.9375 116.2500 116.5625 116.8750 117.1875 | |||
117.5000 117.8125 118.1250 118.4375 118.7500 119.0625 119.3750 119.6875 | |||
120.0000 120.3125 120.6250 120.9375 121.2500 121.5625 121.8750 122.1875 | |||
122.5000 122.8125 123.1250 123.4375 123.7500 124.0625 124.3750 124.6875 | |||
125.0000 125.3125 125.6250 125.9375 126.2500 126.5625 126.8750 127.1875 | |||
127.5000 127.8125 128.1250 128.4375 128.7500 129.0625 129.3750 129.6875 | |||
130.0000 130.3125 130.6250 130.9375 131.2500 131.5625 131.8750 132.1875 | |||
132.5000 132.8125 133.1250 133.4375 133.7500 134.0625 134.3750 134.6875 | |||
135.0000 135.3125 135.6250 135.9375 136.2500 136.5625 136.8750 137.1875 | |||
137.5000 137.8125 138.1250 138.4375 138.7500 139.0625 139.3750 139.6875 | |||
140.0000 | |||
0. | 0.25° x 0.3125° CH latitude centers: | ||
15.0000 15.2500 15.5000 15.7500 16.0000 16.2500 16.5000 16.7500 | |||
17.0000 17.2500 17.5000 17.7500 18.0000 18.2500 18.5000 18.7500 | |||
19.0000 19.2500 19.5000 19.7500 20.0000 20.2500 20.5000 20.7500 | |||
21.0000 21.2500 21.5000 21.7500 22.0000 22.2500 22.5000 22.7500 | |||
23.0000 23.2500 23.5000 23.7500 24.0000 24.2500 24.5000 24.7500 | |||
25.0000 25.2500 25.5000 25.7500 26.0000 26.2500 26.5000 26.7500 | |||
27.0000 27.2500 27.5000 27.7500 28.0000 28.2500 28.5000 28.7500 | |||
29.0000 29.2500 29.5000 29.7500 30.0000 30.2500 30.5000 30.7500 | |||
31.0000 31.2500 31.5000 31.7500 32.0000 32.2500 32.5000 32.7500 | |||
31.0000 31.5000 32.0000 32.5000 33.0000 33.5000 34.0000 34.5000 35.0000 35.5000 36.0000 36.5000 | 33.0000 33.2500 33.5000 33.7500 34.0000 34.2500 34.5000 34.7500 | ||
37.0000 37.5000 38.0000 38.5000 39.0000 39.5000 40.0000 40.5000 41.0000 41.5000 42.0000 42.5000 | 35.0000 35.2500 35.5000 35.7500 36.0000 36.2500 36.5000 36.7500 | ||
43.0000 43.5000 44.0000 44.5000 45.0000 45.5000 46.0000 46.5000 47.0000 47.5000 48.0000 48.5000 | 37.0000 37.2500 37.5000 37.7500 38.0000 38.2500 38.5000 38.7500 | ||
49.0000 49.5000 50.0000 50.5000 51.0000 51.5000 52.0000 52.5000 53.0000 53.5000 54.0000 54.5000 | 39.0000 39.2500 39.5000 39.7500 40.0000 40.2500 40.5000 40.7500 | ||
41.0000 41.2500 41.5000 41.7500 42.0000 42.2500 42.5000 42.7500 | |||
43.0000 43.2500 43.5000 43.7500 44.0000 44.2500 44.5000 44.7500 | |||
45.0000 45.2500 45.5000 45.7500 46.0000 46.2500 46.5000 46.7500 | |||
47.0000 47.2500 47.5000 47.7500 48.0000 48.2500 48.5000 48.7500 | |||
49.0000 49.2500 49.5000 49.7500 50.0000 50.2500 50.5000 50.7500 | |||
51.0000 51.2500 51.5000 51.7500 52.0000 52.2500 52.5000 52.7500 | |||
53.0000 53.2500 53.5000 53.7500 54.0000 54.2500 54.5000 54.7500 | |||
55.0000 | 55.0000 | ||
=== 0. | ==== 0.25 x 0.3125 EU nested grid ==== | ||
This is the [[GEOS-FP]] native-resolution nested-grid over Europe. | |||
[[FlexGrid#0.25.C2.B0_x_0.3125.C2.B0_nested_Europe|This grid may be specified via FlexGrid with these settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | |||
[[File:GEOSFP_025x03125_EU.png]] | |||
0.25° x 0.3125° EU longitude centers: | |||
0.5 | -15.0000 -14.6875 -14.3750 -14.0625 -13.7500 -13.4375 -13.1250 -12.8125 | ||
-12.5000 -12.1875 -11.8750 -11.5625 -11.2500 -10.9375 -10.6250 -10.3125 | |||
-10.0000 -9.6875 -9.3750 -9.0625 -8.7500 -8.4375 -8.1250 -7.8125 | |||
-7.5000 -7.1875 -6.8750 -6.5625 -6.2500 -5.9375 -5.6250 -5.3125 | |||
-5.0000 -4.6875 -4.3750 -4.0625 -3.7500 -3.4375 -3.1250 -2.8125 | |||
-2.5000 -2.1875 -1.8750 -1.5625 -1.2500 -0.9375 -0.6250 -0.3125 | |||
0.0000 0.3125 0.6250 0.9375 1.2500 1.5625 1.8750 2.1875 | |||
2.5000 2.8125 3.1250 3.4375 3.7500 4.0625 4.3750 4.6875 | |||
5.0000 5.3125 5.6250 5.9375 6.2500 6.5625 6.8750 7.1875 | |||
7.5000 7.8125 8.1250 8.4375 8.7500 9.0625 9.3750 9.6875 | |||
10.0000 10.3125 10.6250 10.9375 11.2500 11.5625 11.8750 12.1875 | |||
12.5000 12.8125 13.1250 13.4375 13.7500 14.0625 14.3750 14.6875 | |||
15.0000 15.3125 15.6250 15.9375 16.2500 16.5625 16.8750 17.1875 | |||
17.5000 17.8125 18.1250 18.4375 18.7500 19.0625 19.3750 19.6875 | |||
20.0000 20.3125 20.6250 20.9375 21.2500 21.5625 21.8750 22.1875 | |||
22.5000 22.8125 23.1250 23.4375 23.7500 24.0625 24.3750 24.6875 | |||
25.0000 25.3125 25.6250 25.9375 26.2500 26.5625 26.8750 27.1875 | |||
27.5000 27.8125 28.1250 28.4375 28.7500 29.0625 29.3750 29.6875 | |||
30.0000 30.3125 30.6250 30.9375 31.2500 31.5625 31.8750 32.1875 | |||
32.5000 32.8125 33.1250 33.4375 33.7500 34.0625 34.3750 34.6875 | |||
35.0000 35.3125 35.6250 35.9375 36.2500 36.5625 36.8750 37.1875 | |||
37.5000 37.8125 38.1250 38.4375 38.7500 39.0625 39.3750 39.6875 | |||
40.0000 | |||
0.25° x 0.3125° EU latitude centers: | |||
32.7500 33.0000 33.2500 33.5000 33.7500 34.0000 34.2500 34.5000 | |||
34.7500 35.0000 35.2500 35.5000 35.7500 36.0000 36.2500 36.5000 | |||
36.7500 37.0000 37.2500 37.5000 37.7500 38.0000 38.2500 38.5000 | |||
38.7500 39.0000 39.2500 39.5000 39.7500 40.0000 40.2500 40.5000 | |||
40.7500 41.0000 41.2500 41.5000 41.7500 42.0000 42.2500 42.5000 | |||
42.7500 43.0000 43.2500 43.5000 43.7500 44.0000 44.2500 44.5000 | |||
44.7500 45.0000 45.2500 45.5000 45.7500 46.0000 46.2500 46.5000 | |||
46.7500 47.0000 47.2500 47.5000 47.7500 48.0000 48.2500 48.5000 | |||
48.7500 49.0000 49.2500 49.5000 49.7500 50.0000 50.2500 50.5000 | |||
50.7500 51.0000 51.2500 51.5000 51.7500 52.0000 52.2500 52.5000 | |||
52.7500 53.0000 53.2500 53.5000 53.7500 54.0000 54.2500 54.5000 | |||
54.7500 55.0000 55.2500 55.5000 55.7500 56.0000 56.2500 56.5000 | |||
56.7500 57.0000 57.2500 57.5000 57.7500 58.0000 58.2500 58.5000 | |||
58.7500 59.0000 59.2500 59.5000 59.7500 60.0000 60.2500 60.5000 | |||
60.7500 61.0000 61.2500 | |||
==== 0.25 x 0.3125 NA nested grid ==== | |||
This is the [[GEOS-FP]] native-resolution nested-grid over North America | |||
[[FlexGrid#0.25.C2.B0_x_0.3125.C2.B0_nested_North_America|This grid may be specified via FlexGrid with these settings in <tt>input.geos</tt>]] (in GEOS-Chem 12.4.0 and later). | |||
[[File:GEOSFP_025x03125_NA.png]] | |||
0.25° x 0.3125° NA longitude centers: | |||
-130.0000 -129.6875 -129.3750 -129.0625 -128.7500 -128.4375 -128.1250 -127.8125 | |||
-127.5000 -127.1875 -126.8750 -126.5625 -126.2500 -125.9375 -125.6250 -125.3125 | |||
-125.0000 -124.6875 -124.3750 -124.0625 -123.7500 -123.4375 -123.1250 -122.8125 | |||
-122.5000 -122.1875 -121.8750 -121.5625 -121.2500 -120.9375 -120.6250 -120.3125 | |||
-120.0000 -119.6875 -119.3750 -119.0625 -118.7500 -118.4375 -118.1250 -117.8125 | |||
-117.5000 -117.1875 -116.8750 -116.5625 -116.2500 -115.9375 -115.6250 -115.3125 | |||
-115.0000 -114.6875 -114.3750 -114.0625 -113.7500 -113.4375 -113.1250 -112.8125 | |||
-112.5000 -112.1875 -111.8750 -111.5625 -111.2500 -110.9375 -110.6250 -110.3125 | |||
-110.0000 -109.6875 -109.3750 -109.0625 -108.7500 -108.4375 -108.1250 -107.8125 | |||
-107.5000 -107.1875 -106.8750 -106.5625 -106.2500 -105.9375 -105.6250 -105.3125 | |||
-105.0000 -104.6875 -104.3750 -104.0625 -103.7500 -103.4375 -103.1250 -102.8125 | |||
-102.5000 -102.1875 -101.8750 -101.5625 -101.2500 -100.9375 -100.6250 -100.3125 | |||
-100.0000 -99.6875 -99.3750 -99.0625 -98.7500 -98.4375 -98.1250 -97.8125 | |||
-97.5000 -97.1875 -96.8750 -96.5625 -96.2500 -95.9375 -95.6250 -95.3125 | |||
-95.0000 -94.6875 -94.3750 -94.0625 -93.7500 -93.4375 -93.1250 -92.8125 | |||
-92.5000 -92.1875 -91.8750 -91.5625 -91.2500 -90.9375 -90.6250 -90.3125 | |||
-90.0000 -89.6875 -89.3750 -89.0625 -88.7500 -88.4375 -88.1250 -87.8125 | |||
-87.5000 -87.1875 -86.8750 -86.5625 -86.2500 -85.9375 -85.6250 -85.3125 | |||
-85.0000 -84.6875 -84.3750 -84.0625 -83.7500 -83.4375 -83.1250 -82.8125 | |||
-82.5000 -82.1875 -81.8750 -81.5625 -81.2500 -80.9375 -80.6250 -80.3125 | |||
-80.0000 -79.6875 -79.3750 -79.0625 -78.7500 -78.4375 -78.1250 -77.8125 | |||
-77.5000 -77.1875 -76.8750 -76.5625 -76.2500 -75.9375 -75.6250 -75.3125 | |||
-75.0000 -74.6875 -74.3750 -74.0625 -73.7500 -73.4375 -73.1250 -72.8125 | |||
-72.5000 -72.1875 -71.8750 -71.5625 -71.2500 -70.9375 -70.6250 -70.3125 | |||
-70.0000 -69.6875 -69.3750 -69.0625 -68.7500 -68.4375 -68.1250 -67.8125 | |||
-67.5000 -67.1875 -66.8750 -66.5625 -66.2500 -65.9375 -65.6250 -65.3125 | |||
-65.0000 -64.6875 -64.3750 -64.0625 -63.7500 -63.4375 -63.1250 -62.8125 | |||
-62.5000 -62.1875 -61.8750 -61.5625 -61.2500 -60.9375 -60.6250 -60.3125 | |||
-60.0000 | |||
0.25° x 0.3125° NA latitude centers: | |||
0.25° x 0.3125° | |||
9.7500 10.0000 10.2500 10.5000 10.7500 11.0000 11.2500 11.5000 | |||
11.7500 12.0000 12.2500 12.5000 12.7500 13.0000 13.2500 13.5000 | |||
13.7500 14.0000 14.2500 14.5000 14.7500 15.0000 15.2500 15.5000 | |||
15.7500 16.0000 16.2500 16.5000 16.7500 17.0000 17.2500 17.5000 | |||
17.7500 18.0000 18.2500 18.5000 18.7500 19.0000 19.2500 19.5000 | |||
19.7500 20.0000 20.2500 20.5000 20.7500 21.0000 21.2500 21.5000 | |||
21.7500 22.0000 22.2500 22.5000 22.7500 23.0000 23.2500 23.5000 | |||
23.7500 24.0000 24.2500 24.5000 24.7500 25.0000 25.2500 25.5000 | |||
25.7500 26.0000 26.2500 26.5000 26.7500 27.0000 27.2500 27.5000 | |||
27.7500 28.0000 28.2500 28.5000 28.7500 29.0000 29.2500 29.5000 | |||
29.7500 30.0000 30.2500 30.5000 30.7500 31.0000 31.2500 31.5000 | |||
31.7500 32.0000 32.2500 32.5000 32.7500 33.0000 33.2500 33.5000 | |||
33.7500 34.0000 34.2500 34.5000 34.7500 35.0000 35.2500 35.5000 | |||
35.7500 36.0000 36.2500 36.5000 36.7500 37.0000 37.2500 37.5000 | |||
37.7500 38.0000 38.2500 38.5000 38.7500 39.0000 39.2500 39.5000 | |||
39.7500 40.0000 40.2500 40.5000 40.7500 41.0000 41.2500 41.5000 | |||
41.7500 42.0000 42.2500 42.5000 42.7500 43.0000 43.2500 43.5000 | |||
43.7500 44.0000 44.2500 44.5000 44.7500 45.0000 45.2500 45.5000 | |||
45.7500 46.0000 46.2500 46.5000 46.7500 47.0000 47.2500 47.5000 | |||
47.7500 48.0000 48.2500 48.5000 48.7500 49.0000 49.2500 49.5000 | |||
49.7500 50.0000 50.2500 50.5000 50.7500 51.0000 51.2500 51.5000 | |||
51.7500 52.0000 52.2500 52.5000 52.7500 53.0000 53.2500 53.5000 | |||
53.7500 54.0000 54.2500 54.5000 54.7500 55.0000 55.2500 55.5000 | |||
55.7500 56.0000 56.2500 56.5000 56.7500 57.0000 57.2500 57.5000 | |||
57.7500 58.0000 58.2500 58.5000 58.7500 59.0000 59.2500 59.5000 | |||
59.7500 60.0000 | |||
== Cubed-sphere grids used by GCHP == | |||
[[GEOS-Chem HP|GEOS-Chem with the high-perfomance option (aka GCHP)]] uses cubed-sphere horizontal grids instead of the traditional cartesian grids. For a good general description of cubed sphere grids, [https://geos-chem.seas.harvard.edu/cubedsphere please follow this link]. | |||
Cubed-sphere grid resolutions are denoted using the number of grid points on each face. The table below shows some common cubed-sphere configurations used by GCHP. At present GCHP uses grids with 72 vertical layers, but this may increase to 132 layers in the near future. | |||
0. | {| border=1 cellspacing=0 cellpadding=5 | ||
|-bgcolor="#CCCCCC" valign="top" | |||
!width="75px"|Grid | |||
!width="75px"|# points<br>per face | |||
!width="100px"|# of cells<br>at surface | |||
!width="75px"|# of layers | |||
!width="100px"|# of cells<br> (total) | |||
!width="100px"|Equiv. lat-lon grid | |||
|-valign="top" | |||
|C24 ||24 ||3456 ||72 ||248,832 ||4° x 5° | |||
|-valign="top" | |||
|C48 ||48 ||13,824 ||72 ||995,328 ||2° x 2.5° | |||
|-valign="top" | |||
|C90 ||90 ||48,600 ||72 ||3,499,200 ||1° x 1.25° | |||
0. | |-valign="top" | ||
|C180 ||180 ||194,400 ||72 ||13,996,800 ||0.5° x 0.625° | |||
|-valign="top" | |||
|C360 ||360 ||777,600 ||72 ||55,987,200 ||0.25° x 0.3125° | |||
|} | |||
'''Reference:''' Eastham, S.D., M.S. Long, C.A. Keller, E. Lundgren, R.M. Yantosca, J. Zhuang, C. Li, C.J. Lee, M. Yannetti, B.M. Auer, T.L. Clune, J. Kouatchou, W.M. Putman, M.A. Thompson, A.L. Trayanov, A.M. Molod, R.V. Martin, and D.J. Jacob, ''GEOS-Chem High Performance (GCHP): A next-generation implementation of the GEOS-Chem chemical transport model for massively parallel applications'', <u>Geosci. Mod. Dev.</u>, '''11''', 2941-2953, 2018. [https://www.geosci-model-dev.net/11/2941/2018/gmd-11-2941-2018.pdf PDF] | |||
Latest revision as of 11:35, 28 June 2023
On this page we provide information about the horizontal grids used by GEOS-Chem "Classic" simulations. For information about the vertical coordinates used by GEOS-Chem, please see our GEOS-Chem vertical grids wiki page.
Overview
If you are running GEOS-Chem in "Classic" mode (i.e. without the ESMF library and MPI parallelization), then you may use any of the Cartesian ("lat-lon") grids that are listed below for your simulations.
NOTE: This applies to GEOS-Chem versions prior to 12.4.0: GEOS-Chem stores horizontal grid information in the source code module GeosUtil/gc_grid_mod.F90 (formerly known as GeosUtil/grid_mod.F90. You may call several of the routines of gc_grid_mod.F90 to return the horizontal coordinates of a grid box given the grid box indices.
Our HPC-enabled version of GEOS-Chem (aka GCHP) can read input data on cubed-sphere grids. For more information, please see our GEOS-Chem HP wiki page.
--Bob Yantosca (talk) 21:35, 29 November 2016 (UTC)
FlexGrid: a new way to specify GEOS-Chem traditional and custom grids
The FlexGrid feature will be implemented into GEOS-Chem 12.4.0 and later versions. FlexGrid allows you to specify the traditional GEOS-Chem grid definitions (listed below), as well as custom grids, at runtime. It will no longer be necessary to recompile GEOS-Chem if you want to switch from one grid to another.
For more information about FlexGrid, please see our FlexGrid wiki page.
--Bob Yantosca (talk) 15:05, 30 May 2019 (UTC)
Traditional GEOS-Chem grid definitions
The "traditional" GEOS-Chem global and nested grid definitions are listed below.
GMAO 4 x 5 grid
This grid may be specified via FlexGrid with these settings in input.geos (in GEOS-Chem 12.4.0 and later).
GMAO 4° x 5° longitude centers:
-180.000 -175.000 -170.000 -165.000 -160.000 -155.000 -150.000 -145.000 -140.000 -135.000 -130.000 -125.000 -120.000 -115.000 -110.000 -105.000 -100.000 -95.000 -90.000 -85.000 -80.000 -75.000 -70.000 -65.000 -60.000 -55.000 -50.000 -45.000 -40.000 -35.000 -30.000 -25.000 -20.000 -15.000 -10.000 -5.000 0.000 5.000 10.000 15.000 20.000 25.000 30.000 35.000 40.000 45.000 50.000 55.000 60.000 65.000 70.000 75.000 80.000 85.000 90.000 95.000 100.000 105.000 110.000 115.000 120.000 125.000 130.000 135.000 140.000 145.000 150.000 155.000 160.000 165.000 170.000 175.000
GMAO 4° x 5° latitude centers:
-89.000 -86.000 -82.000 -78.000 -74.000 -70.000 -66.000 -62.000 -58.000 -54.000 -50.000 -46.000 -42.000 -38.000 -34.000 -30.000 -26.000 -22.000 -18.000 -14.000 -10.000 -6.000 -2.000 2.000 6.000 10.000 14.000 18.000 22.000 26.000 30.000 34.000 38.000 42.000 46.000 50.000 54.000 58.000 62.000 66.000 70.000 74.000 78.000 82.000 86.000 89.000
GMAO 2 x 2.5 grid
This grid may be specified via FlexGrid with these settings (for GEOS-Chem 12.4.0 and later).
GMAO 2° x 2.5° longitude centers:
-180.000 -177.500 -175.000 -172.500 -170.000 -167.500 -165.000 -162.500 -160.000 -157.500 -155.000 -152.500 -150.000 -147.500 -145.000 -142.500 -140.000 -137.500 -135.000 -132.500 -130.000 -127.500 -125.000 -122.500 -120.000 -117.500 -115.000 -112.500 -110.000 -107.500 -105.000 -102.500 -100.000 -97.500 -95.000 -92.500 -90.000 -87.500 -85.000 -82.500 -80.000 -77.500 -75.000 -72.500 -70.000 -67.500 -65.000 -62.500 -60.000 -57.500 -55.000 -52.500 -50.000 -47.500 -45.000 -42.500 -40.000 -37.500 -35.000 -32.500 -30.000 -27.500 -25.000 -22.500 -20.000 -17.500 -15.000 -12.500 -10.000 -7.500 -5.000 -2.500 0.000 2.500 5.000 7.500 10.000 12.500 15.000 17.500 20.000 22.500 25.000 27.500 30.000 32.500 35.000 37.500 40.000 42.500 45.000 47.500 50.000 52.500 55.000 57.500 60.000 62.500 65.000 67.500 70.000 72.500 75.000 77.500 80.000 82.500 85.000 87.500 90.000 92.500 95.000 97.500 100.000 102.500 105.000 107.500 110.000 112.500 115.000 117.500 120.000 122.500 125.000 127.500 130.000 132.500 135.000 137.500 140.000 142.500 145.000 147.500 150.000 152.500 155.000 157.500 160.000 162.500 165.000 167.500 170.000 172.500 175.000 177.500
GMAO 2° x 2.5° latitude centers:
-89.500 -88.000 -86.000 -84.000 -82.000 -80.000 -78.000 -76.000 -74.000 -72.000 -70.000 -68.000 -66.000 -64.000 -62.000 -60.000 -58.000 -56.000 -54.000 -52.000 -50.000 -48.000 -46.000 -44.000 -42.000 -40.000 -38.000 -36.000 -34.000 -32.000 -30.000 -28.000 -26.000 -24.000 -22.000 -20.000 -18.000 -16.000 -14.000 -12.000 -10.000 -8.000 -6.000 -4.000 -2.000 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 22.000 24.000 26.000 28.000 30.000 32.000 34.000 36.000 38.000 40.000 42.000 44.000 46.000 48.000 50.000 52.000 54.000 56.000 58.000 60.000 62.000 64.000 66.000 68.000 70.000 72.000 74.000 76.000 78.000 80.000 82.000 84.000 86.000 88.000 89.500
GMAO 0.5 x 0.625 grid
This is the native resolution of the MERRA-2 reanalysis product from GMAO.
The grid coordinates are constructed as follows:
Lon_Center(I) = -180° + ( 0.625° * ( I - 1 ) ), I = 1, 576 Lat_Center(J) = -90° + ( 0.5° * ( J - 1 ) ), J = 1, 361
0.5 x 0.625 AS nested grid
This is the MERRA-2 native resolution nested grid over China and SE Asia.
This grid may be specified with the following settings in input.geos (in GEOS-Chem 12.4.0 and later).
0.5° x 0.625° AS longitude centers:
60.000 60.625 61.250 61.875 62.500 63.125 63.750 64.375 65.000 65.625 66.250 66.875 67.500 68.125 68.750 69.375 70.000 70.625 71.250 71.875 72.500 73.125 73.750 74.375 75.000 75.625 76.250 76.875 77.500 78.125 78.750 79.375 80.000 80.625 81.250 81.875 82.500 83.125 83.750 84.375 85.000 85.625 86.250 86.875 87.500 88.125 88.750 89.375 90.000 90.625 91.250 91.875 92.500 93.125 93.750 94.375 95.000 95.625 96.250 96.875 97.500 98.125 98.750 99.375 100.000 100.625 101.250 101.875 102.500 103.125 103.750 104.375 105.000 105.625 106.250 106.875 107.500 108.125 108.750 109.375 110.000 110.625 111.250 111.875 112.500 113.125 113.750 114.375 115.000 115.625 116.250 116.875 117.500 118.125 118.750 119.375 120.000 120.625 121.250 121.875 122.500 123.125 123.750 124.375 125.000 125.625 126.250 126.875 127.500 128.125 128.750 129.375 130.000 130.625 131.250 131.875 132.500 133.125 133.750 134.375 135.000 135.625 136.250 136.875 137.500 138.125 138.750 139.375 140.000 140.625 141.250 141.875 142.500 143.125 143.750 144.375 145.000 145.625 146.250 146.875 147.500 148.125 148.750 149.375 150.000
0.5° x 0.625° AS latitude centers:
-11.000 -10.500 -10.000 -9.500 -9.000 -8.500 -8.000 -7.500 -7.000 -6.500 -6.000 -5.500 -5.000 -4.500 -4.000 -3.500 -3.000 -2.500 -2.000 -1.500 -1.000 -0.500 0.000 0.500 1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 5.000 5.500 6.000 6.500 7.000 7.500 8.000 8.500 9.000 9.500 10.000 10.500 11.000 11.500 12.000 12.500 13.000 13.500 14.000 14.500 15.000 15.500 16.000 16.500 17.000 17.500 18.000 18.500 19.000 19.500 20.000 20.500 21.000 21.500 22.000 22.500 23.000 23.500 24.000 24.500 25.000 25.500 26.000 26.500 27.000 27.500 28.000 28.500 29.000 29.500 30.000 30.500 31.000 31.500 32.000 32.500 33.000 33.500 34.000 34.500 35.000 35.500 36.000 36.500 37.000 37.500 38.000 38.500 39.000 39.500 40.000 40.500 41.000 41.500 42.000 42.500 43.000 43.500 44.000 44.500 45.000 45.500 46.000 46.500 47.000 47.500 48.000 48.500 49.000 49.500 50.000 50.500 51.000 51.500 52.000 52.500 53.000 53.500 54.000 54.500 55.000
0.5 x 0.625 EU nested grid
This is the MERRA-2 native resolution nested grid over Europe.
This grid may be specified via FlexGrid with these settings in input.geos (in GEOS-Chem 12.4.0 and later).
0.5° x 0.625° EU longitude centers:
-30.000 -29.375 -28.750 -28.125 -27.500 -26.875 -26.250 -25.625 -25.000 -24.375 -23.750 -23.125 -22.500 -21.875 -21.250 -20.625 -20.000 -19.375 -18.750 -18.125 -17.500 -16.875 -16.250 -15.625 -15.000 -14.375 -13.750 -13.125 -12.500 -11.875 -11.250 -10.625 -10.000 -9.375 -8.750 -8.125 -7.500 -6.875 -6.250 -5.625 -5.000 -4.375 -3.750 -3.125 -2.500 -1.875 -1.250 -0.625 0.000 0.625 1.250 1.875 2.500 3.125 3.750 4.375 5.000 5.625 6.250 6.875 7.500 8.125 8.750 9.375 10.000 10.625 11.250 11.875 12.500 13.125 13.750 14.375 15.000 15.625 16.250 16.875 17.500 18.125 18.750 19.375 20.000 20.625 21.250 21.875 22.500 23.125 23.750 24.375 25.000 25.625 26.250 26.875 27.500 28.125 28.750 29.375 30.000 30.625 31.250 31.875 32.500 33.125 33.750 34.375 35.000 35.625 36.250 36.875 37.500 38.125 38.750 39.375 40.000 40.625 41.250 41.875 42.500 43.125 43.750 44.375 45.000 45.625 46.250 46.875 47.500 48.125 48.750 49.375 50.000
0.5° x 0.625° EU latitude centers:
30.000 30.500 31.000 31.500 32.000 32.500 33.000 33.500 34.000 34.500 35.000 35.500 36.000 36.500 37.000 37.500 38.000 38.500 39.000 39.500 40.000 40.500 41.000 41.500 42.000 42.500 43.000 43.500 44.000 44.500 45.000 45.500 46.000 46.500 47.000 47.500 48.000 48.500 49.000 49.500 50.000 50.500 51.000 51.500 52.000 52.500 53.000 53.500 54.000 54.500 55.000 55.500 56.000 56.500 57.000 57.500 58.000 58.500 59.000 59.500 60.000 60.500 61.000 61.500 62.000 62.500 63.000 63.500 64.000 64.500 65.000 65.500 66.000 66.500 67.000 67.500 68.000 68.500 69.000 69.500 70.000
0.5 x 0.625 NA nested grid
This is the MERRA-2 native resolution nested grid over North America.
This grid may be specified via FlexGrid with these settings in input.geos (in GEOS-Chem 12.4.0 and later).
0.5° x 0.625° NA longitude centers:
-140.000 -139.375 -138.750 -138.125 -137.500 -136.875 -136.250 -135.625 -135.000 -134.375 -133.750 -133.125 -132.500 -131.875 -131.250 -130.625 -130.000 -129.375 -128.750 -128.125 -127.500 -126.875 -126.250 -125.625 -125.000 -124.375 -123.750 -123.125 -122.500 -121.875 -121.250 -120.625 -120.000 -119.375 -118.750 -118.125 -117.500 -116.875 -116.250 -115.625 -115.000 -114.375 -113.750 -113.125 -112.500 -111.875 -111.250 -110.625 -110.000 -109.375 -108.750 -108.125 -107.500 -106.875 -106.250 -105.625 -105.000 -104.375 -103.750 -103.125 -102.500 -101.875 -101.250 -100.625 -100.000 -99.375 -98.750 -98.125 -97.500 -96.875 -96.250 -95.625 -95.000 -94.375 -93.750 -93.125 -92.500 -91.875 -91.250 -90.625 -90.000 -89.375 -88.750 -88.125 -87.500 -86.875 -86.250 -85.625 -85.000 -84.375 -83.750 -83.125 -82.500 -81.875 -81.250 -80.625 -80.000 -79.375 -78.750 -78.125 -77.500 -76.875 -76.250 -75.625 -75.000 -74.375 -73.750 -73.125 -72.500 -71.875 -71.250 -70.625 -70.000 -69.375 -68.750 -68.125 -67.500 -66.875 -66.250 -65.625 -65.000 -64.375 -63.750 -63.125 -62.500 -61.875 -61.250 -60.625 -60.000 -59.375 -58.750 -58.125 -57.500 -56.875 -56.250 -55.625 -55.000 -54.375 -53.750 -53.125 -52.500 -51.875 -51.250 -50.625 -50.000 -49.375 -48.750 -48.125 -47.500 -46.875 -46.250 -45.625 -45.000 -44.375 -43.750 -43.125 -42.500 -41.875 -41.250 -40.625 -40.000
0.5° x 0.625° NA latitude centers:
10.000 10.500 11.000 11.500 12.000 12.500 13.000 13.500 14.000 14.500 15.000 15.500 16.000 16.500 17.000 17.500 18.000 18.500 19.000 19.500 20.000 20.500 21.000 21.500 22.000 22.500 23.000 23.500 24.000 24.500 25.000 25.500 26.000 26.500 27.000 27.500 28.000 28.500 29.000 29.500 30.000 30.500 31.000 31.500 32.000 32.500 33.000 33.500 34.000 34.500 35.000 35.500 36.000 36.500 37.000 37.500 38.000 38.500 39.000 39.500 40.000 40.500 41.000 41.500 42.000 42.500 43.000 43.500 44.000 44.500 45.000 45.500 46.000 46.500 47.000 47.500 48.000 48.500 49.000 49.500 50.000 50.500 51.000 51.500 52.000 52.500 53.000 53.500 54.000 54.500 55.000 55.500 56.000 56.500 57.000 57.500 58.000 58.500 59.000 59.500 60.000 60.500 61.000 61.500 62.000 62.500 63.000 63.500 64.000 64.500 65.000 65.500 66.000 66.500 67.000 67.500 68.000 68.500 69.000 69.500 70.000
GMAO 0.25 x 0.3125 grid
This is the native resolution of the GEOS-5 "forward processing" (which we call GEOS-FP) operational data product from GMAO.
The grid coordinates are computed as follows:
Lon_Center(I) = -180° + [ 0.3125° * ( I - 1 ) ], I = 1, 1152 Lat_Center(I) = -90° + [ 0.25° * ( J - 1 ) ], J = 1, 721
0.25 x 0.3125 CH nested grid
This is the GEOS-FP native-resolution nested-grid over China.
This grid may be specified via FlexGrid with these settings in input.geos (in GEOS-Chem 12.4.0 and later).
0.25° x 0.3125° CH longitude centers:
70.0000 70.3125 70.6250 70.9375 71.2500 71.5625 71.8750 72.1875 72.5000 72.8125 73.1250 73.4375 73.7500 74.0625 74.3750 74.6875 75.0000 75.3125 75.6250 75.9375 76.2500 76.5625 76.8750 77.1875 77.5000 77.8125 78.1250 78.4375 78.7500 79.0625 79.3750 79.6875 80.0000 80.3125 80.6250 80.9375 81.2500 81.5625 81.8750 82.1875 82.5000 82.8125 83.1250 83.4375 83.7500 84.0625 84.3750 84.6875 85.0000 85.3125 85.6250 85.9375 86.2500 86.5625 86.8750 87.1875 87.5000 87.8125 88.1250 88.4375 88.7500 89.0625 89.3750 89.6875 90.0000 90.3125 90.6250 90.9375 91.2500 91.5625 91.8750 92.1875 92.5000 92.8125 93.1250 93.4375 93.7500 94.0625 94.3750 94.6875 95.0000 95.3125 95.6250 95.9375 96.2500 96.5625 96.8750 97.1875 97.5000 97.8125 98.1250 98.4375 98.7500 99.0625 99.3750 99.6875 100.0000 100.3125 100.6250 100.9375 101.2500 101.5625 101.8750 102.1875 102.5000 102.8125 103.1250 103.4375 103.7500 104.0625 104.3750 104.6875 105.0000 105.3125 105.6250 105.9375 106.2500 106.5625 106.8750 107.1875 107.5000 107.8125 108.1250 108.4375 108.7500 109.0625 109.3750 109.6875 110.0000 110.3125 110.6250 110.9375 111.2500 111.5625 111.8750 112.1875 112.5000 112.8125 113.1250 113.4375 113.7500 114.0625 114.3750 114.6875 115.0000 115.3125 115.6250 115.9375 116.2500 116.5625 116.8750 117.1875 117.5000 117.8125 118.1250 118.4375 118.7500 119.0625 119.3750 119.6875 120.0000 120.3125 120.6250 120.9375 121.2500 121.5625 121.8750 122.1875 122.5000 122.8125 123.1250 123.4375 123.7500 124.0625 124.3750 124.6875 125.0000 125.3125 125.6250 125.9375 126.2500 126.5625 126.8750 127.1875 127.5000 127.8125 128.1250 128.4375 128.7500 129.0625 129.3750 129.6875 130.0000 130.3125 130.6250 130.9375 131.2500 131.5625 131.8750 132.1875 132.5000 132.8125 133.1250 133.4375 133.7500 134.0625 134.3750 134.6875 135.0000 135.3125 135.6250 135.9375 136.2500 136.5625 136.8750 137.1875 137.5000 137.8125 138.1250 138.4375 138.7500 139.0625 139.3750 139.6875 140.0000
0.25° x 0.3125° CH latitude centers:
15.0000 15.2500 15.5000 15.7500 16.0000 16.2500 16.5000 16.7500 17.0000 17.2500 17.5000 17.7500 18.0000 18.2500 18.5000 18.7500 19.0000 19.2500 19.5000 19.7500 20.0000 20.2500 20.5000 20.7500 21.0000 21.2500 21.5000 21.7500 22.0000 22.2500 22.5000 22.7500 23.0000 23.2500 23.5000 23.7500 24.0000 24.2500 24.5000 24.7500 25.0000 25.2500 25.5000 25.7500 26.0000 26.2500 26.5000 26.7500 27.0000 27.2500 27.5000 27.7500 28.0000 28.2500 28.5000 28.7500 29.0000 29.2500 29.5000 29.7500 30.0000 30.2500 30.5000 30.7500 31.0000 31.2500 31.5000 31.7500 32.0000 32.2500 32.5000 32.7500 33.0000 33.2500 33.5000 33.7500 34.0000 34.2500 34.5000 34.7500 35.0000 35.2500 35.5000 35.7500 36.0000 36.2500 36.5000 36.7500 37.0000 37.2500 37.5000 37.7500 38.0000 38.2500 38.5000 38.7500 39.0000 39.2500 39.5000 39.7500 40.0000 40.2500 40.5000 40.7500 41.0000 41.2500 41.5000 41.7500 42.0000 42.2500 42.5000 42.7500 43.0000 43.2500 43.5000 43.7500 44.0000 44.2500 44.5000 44.7500 45.0000 45.2500 45.5000 45.7500 46.0000 46.2500 46.5000 46.7500 47.0000 47.2500 47.5000 47.7500 48.0000 48.2500 48.5000 48.7500 49.0000 49.2500 49.5000 49.7500 50.0000 50.2500 50.5000 50.7500 51.0000 51.2500 51.5000 51.7500 52.0000 52.2500 52.5000 52.7500 53.0000 53.2500 53.5000 53.7500 54.0000 54.2500 54.5000 54.7500 55.0000
0.25 x 0.3125 EU nested grid
This is the GEOS-FP native-resolution nested-grid over Europe.
This grid may be specified via FlexGrid with these settings in input.geos (in GEOS-Chem 12.4.0 and later).
0.25° x 0.3125° EU longitude centers:
-15.0000 -14.6875 -14.3750 -14.0625 -13.7500 -13.4375 -13.1250 -12.8125
-12.5000 -12.1875 -11.8750 -11.5625 -11.2500 -10.9375 -10.6250 -10.3125
-10.0000 -9.6875 -9.3750 -9.0625 -8.7500 -8.4375 -8.1250 -7.8125
-7.5000 -7.1875 -6.8750 -6.5625 -6.2500 -5.9375 -5.6250 -5.3125
-5.0000 -4.6875 -4.3750 -4.0625 -3.7500 -3.4375 -3.1250 -2.8125
-2.5000 -2.1875 -1.8750 -1.5625 -1.2500 -0.9375 -0.6250 -0.3125
0.0000 0.3125 0.6250 0.9375 1.2500 1.5625 1.8750 2.1875
2.5000 2.8125 3.1250 3.4375 3.7500 4.0625 4.3750 4.6875
5.0000 5.3125 5.6250 5.9375 6.2500 6.5625 6.8750 7.1875
7.5000 7.8125 8.1250 8.4375 8.7500 9.0625 9.3750 9.6875
10.0000 10.3125 10.6250 10.9375 11.2500 11.5625 11.8750 12.1875
12.5000 12.8125 13.1250 13.4375 13.7500 14.0625 14.3750 14.6875
15.0000 15.3125 15.6250 15.9375 16.2500 16.5625 16.8750 17.1875
17.5000 17.8125 18.1250 18.4375 18.7500 19.0625 19.3750 19.6875
20.0000 20.3125 20.6250 20.9375 21.2500 21.5625 21.8750 22.1875
22.5000 22.8125 23.1250 23.4375 23.7500 24.0625 24.3750 24.6875
25.0000 25.3125 25.6250 25.9375 26.2500 26.5625 26.8750 27.1875
27.5000 27.8125 28.1250 28.4375 28.7500 29.0625 29.3750 29.6875
30.0000 30.3125 30.6250 30.9375 31.2500 31.5625 31.8750 32.1875
32.5000 32.8125 33.1250 33.4375 33.7500 34.0625 34.3750 34.6875
35.0000 35.3125 35.6250 35.9375 36.2500 36.5625 36.8750 37.1875
37.5000 37.8125 38.1250 38.4375 38.7500 39.0625 39.3750 39.6875
40.0000
0.25° x 0.3125° EU latitude centers:
32.7500 33.0000 33.2500 33.5000 33.7500 34.0000 34.2500 34.5000 34.7500 35.0000 35.2500 35.5000 35.7500 36.0000 36.2500 36.5000 36.7500 37.0000 37.2500 37.5000 37.7500 38.0000 38.2500 38.5000 38.7500 39.0000 39.2500 39.5000 39.7500 40.0000 40.2500 40.5000 40.7500 41.0000 41.2500 41.5000 41.7500 42.0000 42.2500 42.5000 42.7500 43.0000 43.2500 43.5000 43.7500 44.0000 44.2500 44.5000 44.7500 45.0000 45.2500 45.5000 45.7500 46.0000 46.2500 46.5000 46.7500 47.0000 47.2500 47.5000 47.7500 48.0000 48.2500 48.5000 48.7500 49.0000 49.2500 49.5000 49.7500 50.0000 50.2500 50.5000 50.7500 51.0000 51.2500 51.5000 51.7500 52.0000 52.2500 52.5000 52.7500 53.0000 53.2500 53.5000 53.7500 54.0000 54.2500 54.5000 54.7500 55.0000 55.2500 55.5000 55.7500 56.0000 56.2500 56.5000 56.7500 57.0000 57.2500 57.5000 57.7500 58.0000 58.2500 58.5000 58.7500 59.0000 59.2500 59.5000 59.7500 60.0000 60.2500 60.5000 60.7500 61.0000 61.2500
0.25 x 0.3125 NA nested grid
This is the GEOS-FP native-resolution nested-grid over North America
This grid may be specified via FlexGrid with these settings in input.geos (in GEOS-Chem 12.4.0 and later).
0.25° x 0.3125° NA longitude centers:
-130.0000 -129.6875 -129.3750 -129.0625 -128.7500 -128.4375 -128.1250 -127.8125 -127.5000 -127.1875 -126.8750 -126.5625 -126.2500 -125.9375 -125.6250 -125.3125 -125.0000 -124.6875 -124.3750 -124.0625 -123.7500 -123.4375 -123.1250 -122.8125 -122.5000 -122.1875 -121.8750 -121.5625 -121.2500 -120.9375 -120.6250 -120.3125 -120.0000 -119.6875 -119.3750 -119.0625 -118.7500 -118.4375 -118.1250 -117.8125 -117.5000 -117.1875 -116.8750 -116.5625 -116.2500 -115.9375 -115.6250 -115.3125 -115.0000 -114.6875 -114.3750 -114.0625 -113.7500 -113.4375 -113.1250 -112.8125 -112.5000 -112.1875 -111.8750 -111.5625 -111.2500 -110.9375 -110.6250 -110.3125 -110.0000 -109.6875 -109.3750 -109.0625 -108.7500 -108.4375 -108.1250 -107.8125 -107.5000 -107.1875 -106.8750 -106.5625 -106.2500 -105.9375 -105.6250 -105.3125 -105.0000 -104.6875 -104.3750 -104.0625 -103.7500 -103.4375 -103.1250 -102.8125 -102.5000 -102.1875 -101.8750 -101.5625 -101.2500 -100.9375 -100.6250 -100.3125 -100.0000 -99.6875 -99.3750 -99.0625 -98.7500 -98.4375 -98.1250 -97.8125 -97.5000 -97.1875 -96.8750 -96.5625 -96.2500 -95.9375 -95.6250 -95.3125 -95.0000 -94.6875 -94.3750 -94.0625 -93.7500 -93.4375 -93.1250 -92.8125 -92.5000 -92.1875 -91.8750 -91.5625 -91.2500 -90.9375 -90.6250 -90.3125 -90.0000 -89.6875 -89.3750 -89.0625 -88.7500 -88.4375 -88.1250 -87.8125 -87.5000 -87.1875 -86.8750 -86.5625 -86.2500 -85.9375 -85.6250 -85.3125 -85.0000 -84.6875 -84.3750 -84.0625 -83.7500 -83.4375 -83.1250 -82.8125 -82.5000 -82.1875 -81.8750 -81.5625 -81.2500 -80.9375 -80.6250 -80.3125 -80.0000 -79.6875 -79.3750 -79.0625 -78.7500 -78.4375 -78.1250 -77.8125 -77.5000 -77.1875 -76.8750 -76.5625 -76.2500 -75.9375 -75.6250 -75.3125 -75.0000 -74.6875 -74.3750 -74.0625 -73.7500 -73.4375 -73.1250 -72.8125 -72.5000 -72.1875 -71.8750 -71.5625 -71.2500 -70.9375 -70.6250 -70.3125 -70.0000 -69.6875 -69.3750 -69.0625 -68.7500 -68.4375 -68.1250 -67.8125 -67.5000 -67.1875 -66.8750 -66.5625 -66.2500 -65.9375 -65.6250 -65.3125 -65.0000 -64.6875 -64.3750 -64.0625 -63.7500 -63.4375 -63.1250 -62.8125 -62.5000 -62.1875 -61.8750 -61.5625 -61.2500 -60.9375 -60.6250 -60.3125 -60.0000
0.25° x 0.3125° NA latitude centers:
9.7500 10.0000 10.2500 10.5000 10.7500 11.0000 11.2500 11.5000 11.7500 12.0000 12.2500 12.5000 12.7500 13.0000 13.2500 13.5000 13.7500 14.0000 14.2500 14.5000 14.7500 15.0000 15.2500 15.5000 15.7500 16.0000 16.2500 16.5000 16.7500 17.0000 17.2500 17.5000 17.7500 18.0000 18.2500 18.5000 18.7500 19.0000 19.2500 19.5000 19.7500 20.0000 20.2500 20.5000 20.7500 21.0000 21.2500 21.5000 21.7500 22.0000 22.2500 22.5000 22.7500 23.0000 23.2500 23.5000 23.7500 24.0000 24.2500 24.5000 24.7500 25.0000 25.2500 25.5000 25.7500 26.0000 26.2500 26.5000 26.7500 27.0000 27.2500 27.5000 27.7500 28.0000 28.2500 28.5000 28.7500 29.0000 29.2500 29.5000 29.7500 30.0000 30.2500 30.5000 30.7500 31.0000 31.2500 31.5000 31.7500 32.0000 32.2500 32.5000 32.7500 33.0000 33.2500 33.5000 33.7500 34.0000 34.2500 34.5000 34.7500 35.0000 35.2500 35.5000 35.7500 36.0000 36.2500 36.5000 36.7500 37.0000 37.2500 37.5000 37.7500 38.0000 38.2500 38.5000 38.7500 39.0000 39.2500 39.5000 39.7500 40.0000 40.2500 40.5000 40.7500 41.0000 41.2500 41.5000 41.7500 42.0000 42.2500 42.5000 42.7500 43.0000 43.2500 43.5000 43.7500 44.0000 44.2500 44.5000 44.7500 45.0000 45.2500 45.5000 45.7500 46.0000 46.2500 46.5000 46.7500 47.0000 47.2500 47.5000 47.7500 48.0000 48.2500 48.5000 48.7500 49.0000 49.2500 49.5000 49.7500 50.0000 50.2500 50.5000 50.7500 51.0000 51.2500 51.5000 51.7500 52.0000 52.2500 52.5000 52.7500 53.0000 53.2500 53.5000 53.7500 54.0000 54.2500 54.5000 54.7500 55.0000 55.2500 55.5000 55.7500 56.0000 56.2500 56.5000 56.7500 57.0000 57.2500 57.5000 57.7500 58.0000 58.2500 58.5000 58.7500 59.0000 59.2500 59.5000 59.7500 60.0000
Cubed-sphere grids used by GCHP
GEOS-Chem with the high-perfomance option (aka GCHP) uses cubed-sphere horizontal grids instead of the traditional cartesian grids. For a good general description of cubed sphere grids, please follow this link.
Cubed-sphere grid resolutions are denoted using the number of grid points on each face. The table below shows some common cubed-sphere configurations used by GCHP. At present GCHP uses grids with 72 vertical layers, but this may increase to 132 layers in the near future.
| Grid | # points per face |
# of cells at surface |
# of layers | # of cells (total) |
Equiv. lat-lon grid |
|---|---|---|---|---|---|
| C24 | 24 | 3456 | 72 | 248,832 | 4° x 5° |
| C48 | 48 | 13,824 | 72 | 995,328 | 2° x 2.5° |
| C90 | 90 | 48,600 | 72 | 3,499,200 | 1° x 1.25° |
| C180 | 180 | 194,400 | 72 | 13,996,800 | 0.5° x 0.625° |
| C360 | 360 | 777,600 | 72 | 55,987,200 | 0.25° x 0.3125° |
Reference: Eastham, S.D., M.S. Long, C.A. Keller, E. Lundgren, R.M. Yantosca, J. Zhuang, C. Li, C.J. Lee, M. Yannetti, B.M. Auer, T.L. Clune, J. Kouatchou, W.M. Putman, M.A. Thompson, A.L. Trayanov, A.M. Molod, R.V. Martin, and D.J. Jacob, GEOS-Chem High Performance (GCHP): A next-generation implementation of the GEOS-Chem chemical transport model for massively parallel applications, Geosci. Mod. Dev., 11, 2941-2953, 2018. PDF