Difference between revisions of "Overview of GMAO met data products"
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--[[User:Bmy|Bob Y.]] 16:24, 27 July 2010 (EDT) | --[[User:Bmy|Bob Y.]] 16:24, 27 July 2010 (EDT) | ||
+ | |||
+ | == GEOS-1 and GEOS-STRAT == | ||
+ | |||
+ | GEOS-1 was the first GMAO met field data product compatible with GEOS-Chem. GEOS-STRAT was a continuation of GEOS-1, but with a finer vertical grid. | ||
+ | |||
+ | === GEOS-1 features === | ||
+ | |||
+ | {| border=1 cellspacing=0 cellpadding=5 | ||
+ | |- | ||
+ | |'''Assimilation GCM used''' | ||
+ | |NASA/GSFC GEOS1 GCM | ||
+ | |-valign="top" | ||
+ | |'''Native horizontal grid:''' | ||
+ | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.3 2° x 2.5°] | ||
+ | |-valign="top" | ||
+ | |'''Native vertical grid:''' | ||
+ | |20 pure-sigma layers, model top at 10 hPa | ||
+ | |-valign="top" | ||
+ | |'''Native file format:''' | ||
+ | |NASA PHOENIX format (binary Fortran unformatted) | ||
+ | |-valign="top" | ||
+ | |'''Temporal coverage:''' | ||
+ | |1985-1995 | ||
+ | |-valign="top" | ||
+ | |'''We regridded to:''' | ||
+ | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.2 4 x 5]; 20 pure-sigma layers | ||
+ | |-valign="top" | ||
+ | |'''Strengths:''' | ||
+ | | | ||
+ | *Long temporal coverage (10 years) | ||
+ | |-valign="top" | ||
+ | |'''Weaknesses:''' | ||
+ | | | ||
+ | *Very low model top (10 hPa) | ||
+ | *Strat-trop exchange was too fast by 2-3X | ||
+ | |} | ||
+ | |||
+ | === GEOS-STRAT features === | ||
+ | |||
+ | {| border=1 cellspacing=0 cellpadding=5 | ||
+ | |- | ||
+ | |'''Assimilation GCM used''' | ||
+ | |NASA/GSFC GEOS1 GCM | ||
+ | |-valign="top" | ||
+ | |'''Native horizontal grid:''' | ||
+ | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.3 2° x 2.5°] | ||
+ | |-valign="top" | ||
+ | |'''Native vertical grid:''' | ||
+ | |46 pure-sigma layers, model top at 0.1 hPa | ||
+ | |-valign="top" | ||
+ | |'''Native file format:''' | ||
+ | |NASA PHOENIX format (binary Fortran unformatted) | ||
+ | |-valign="top" | ||
+ | |'''Temporal coverage:''' | ||
+ | |1996-1997 (some 1998) | ||
+ | |-valign="top" | ||
+ | |'''We regridded to:''' | ||
+ | |[http://acmg.seas.harvard.edu/geos/doc/man/appendix_2.html#A2.2 4 x 5]; 26 pure-sigma layers | ||
+ | |-valign="top" | ||
+ | |'''Strengths:''' | ||
+ | | | ||
+ | *Higher model top, better stratospheric representation | ||
+ | |-valign="top" | ||
+ | |'''Weaknesses:''' | ||
+ | | | ||
+ | *Vertical grid did not correspond to GEOS–1 | ||
+ | *STE still too fast by 2-3X | ||
+ | *Surface data had a 6-hr temporal resolution, we had to interpolate to a 3-hr temporal resolution ourselves | ||
+ | |} | ||
+ | |||
+ | --[[User:Bmy|Bob Y.]] 16:43, 27 July 2010 (EDT) |
Revision as of 20:43, 27 July 2010
Contents
GMAO data products used by GEOS-Chem
GEOS-1 | GEOS-STRAT | GEOS-3 | GEOS-4 | GEOS-5 | MERRA | |
---|---|---|---|---|---|---|
Native # of levels | 20 sigma | 26 sigma | 48 sigma | 55 hybrid | 72 hybrid | 72 hybrid |
Native grid | 2° x 2.5° | 2 x 2.5 | 1° x 1° | 1° x 1.25° | 0.5° x 0.666° | 0.5 x 0.666 and 1 x 1.25 |
Native file format | Binary | Binary | HDF4-EOS | HDF4-EOS | HDF4-EOS | HDF4-EOS |
Regridded to | 2° x 2.5° 4 x 5 |
2° x 2.5° 4° x 5° |
1° x 1° nested °2 x 2.5° 4° x 5°l |
2° x 2.5° 4° x 5° |
0.5° x 0.666° nested 2° x 2.5° 4° x 5° |
4 x 5 |
Temporal coverage | 1985 - 1995 | 1996 - 1998 | 2000 - 2002 | 1985 - 2007 | 2004 - present | 1979 - 2010 |
NOTES:
- GEOS-1 and GEOS-STRAT are now obsolete and no longer supported by GEOS-Chem
- GEOS-3 is still supported but we recommend users to migrate to GEOS-4 or GEOS-5.
- MERRA data will be made available at 4 x 5 resolution in the near future. MERRA is a long-term reanalysis done with version GEOS-5.2.0.
--Bob Y. 16:24, 27 July 2010 (EDT)
GEOS-1 and GEOS-STRAT
GEOS-1 was the first GMAO met field data product compatible with GEOS-Chem. GEOS-STRAT was a continuation of GEOS-1, but with a finer vertical grid.
GEOS-1 features
Assimilation GCM used | NASA/GSFC GEOS1 GCM |
Native horizontal grid: | 2° x 2.5° |
Native vertical grid: | 20 pure-sigma layers, model top at 10 hPa |
Native file format: | NASA PHOENIX format (binary Fortran unformatted) |
Temporal coverage: | 1985-1995 |
We regridded to: | 4 x 5; 20 pure-sigma layers |
Strengths: |
|
Weaknesses: |
|
GEOS-STRAT features
Assimilation GCM used | NASA/GSFC GEOS1 GCM |
Native horizontal grid: | 2° x 2.5° |
Native vertical grid: | 46 pure-sigma layers, model top at 0.1 hPa |
Native file format: | NASA PHOENIX format (binary Fortran unformatted) |
Temporal coverage: | 1996-1997 (some 1998) |
We regridded to: | 4 x 5; 26 pure-sigma layers |
Strengths: |
|
Weaknesses: |
|
--Bob Y. 16:43, 27 July 2010 (EDT)