List of GCAP met fields

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Obsolete.jpg

NOTE: GCAP in the standard GEOS-Chem is mostly obsolete. Most simulations using the GCAP meteorology are now performed with the ICECAP model. This is a separate code base in which the GISS Model E dynamics have been integrated into GEOS-Chem.

Here is a description of the GCAP met fields. These are saved out from the GISS-GCM and can be used to drive GEOS-Chem simulations for the GCAP project.

A-3 Fields

  • These are 3-hr time-averaged fields.
  • Data times: 1:30, 4:30, 7:30, ..., 22:30 GMT
  • All A-3 fields are 2-dimensional (lon,lat)
GCAP Field Description Units
ALBEDO 2-D surface albedo unitless (=0 over dark areas)
PREACC 2-D total precipitation mm/day
PRECON 2-D convective precipitation mm H2O/day
TS 2-D surface temperature K
MOLENGTH 2-D Monin-Obukhov length m
USTAR 2-D friction velocity m/s
PBL 2-D boundary layer height m
RADSWG 2-D incident radiation at ground W/m2
SNICE 2-D fraction of box covered with snow or land or ocean ice unitless
OICE 2-D ocean or lake ice fraction unitless
USS 2-D U-wind @ 10m above ground m/s
VSS 2-D V-wind @ 10m above ground m/s
SOIL 2-D volumetric water content m3/m3
SNOWD 2-D snow depth mm
PARDIR 2-D direct photosynthetically active radiation W/m2
PARDIF 2-D diffusive photosynthetically active radiation W/m2

NOTE: The albedo is calculated only when sunlight is shining. During a dark timestep, the program "remembers" the albedo from the previous timestep. The problem is that some places are in continuous night.

--Melissa Sulprizio 14:32, 15 April 2015 (EDT)

A-6 Fields

  • These are 3-hr time-averaged fields.
  • Data times: 00:00, 06:00, 12:00, 18:00 GMT
  • All A-6 fields are 3-dimensional (lon,lat,alt)
GCAP FIELD Description Units
T 3-D temperature K
U 3-D zonal wind m/s
V 3-D meridional wind m/s
OPTDEPTH 3-D optical depth unitless (=0 above layer 13)
CLDF 3-D cloud fraction unitless (=0 above layer 13)
Q 3-D specific humidity kg H2O/kg air
MOISTQ 3-D tendency of specific humdity (q) w/r/t precip. g H2O/kg air/day
UPDE 3-D convective updraft flux Pa/s
DNDE 3-D convective downdraft flux Pa/s
ENTRAIN 3-D convective entrainment Pa/s
DETRAINE 3-D convective detrainment Pa/s
UPDN 3-D convective updraft flux (for non-entraining plume) Pa/s
DNDN 3-D convective downdraft flux (for non-entraining plume) Pa/s
DETRAINN 3-D convective detrainment (for non-entraining plume) Pa/s

--Melissa Sulprizio 14:32, 15 April 2015 (EDT)

I-6 fields

  • These are 3-hr time-averaged fields.
  • Data times: 00:00, 06:00, 12:00, 18:00 GMT
  • All I-6 fields are 2-dimensional (lon,lat)
GCAP Field Description Units
PS 2-D surface pressure hPa
SLP 2-D sea level pressure hPa

--Melissa Sulprizio 14:32, 15 April 2015 (EDT)

Constant fields

  • These are time-invariant fields
  • Constant fields are 2-dimensional (lon,lat)
GCAP Field Description Units
PHIS 3-D surface geopotential height m2/s2
LWI 2-D land fraction fraction

--Melissa Sulprizio 14:32, 15 April 2015 (EDT)