Version history of GMAO met data products

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On this page we provide a version history for the GMAO meteorological data products used by GEOS-Chem. We shall endeavor to document a timeline of changes that were made into the GMAO operational data products.

Quick reference table

Our meteorological data archives for GEOS-Chem—which we have named GEOS-5, MERRA, GEOS-FP, and MERRA-2—contain data that were created by different versions of the NASA/GMAO Data Assimilation System (DAS). You can use the table below to find the GMAO data version number corresponding to a particular date for each of these archives.

GEOS-Chem met field archive name GMAO
version number
Start date
(in GEOS-Chem archive)
End date
(in GEOS-Chem archive)
Still supported in GEOS-Chem?
GEOS-5 GEOS-5.1.0 01 Dec 2003 31 Aug 2008 To be desupported in GEOS-Chem v11-02
" " GEOS-5.2.0 01 Sep 2008 31 May 2013 " "
MERRA GEOS-5.2.0
"MERRA100 Stream"
01 Jan 1979 31 Dec 1992 To be desupported in GEOS-Chem v11-02
" " GEOS-5.2.0
"MERRA200 Stream"
01 Jan 1992 31 Dec 2000 " "
" " GEOS-5.2.0
"MERRA300 Stream"
01 Jan 2001 Jun 2015 " "
GEOS-FP GEOS-5.7.2 01 Apr 2012 10 Jun 2013 Yes, this is the current GMAO operational product
" " GEOS-5.11.0 11 Jun 2013 20 Aug 2014 (06:00 UTC) " "
" " GEOS-5.13.0 20 Aug 2014 (06:00 UTC) 01 May 2015 (06:00 UTC) " "
" " GEOS-5.13.1 01 May 2015 (06:00 UTC) 24 Jan 2017 " "
" " GEOS-5.16.5 24 Jan 2017 present " "
MERRA-2 GEOS-5.12.4 01 Jan 1980 present Yes, this is the current GMAO reanalysis product

NOTE: The dates listed in the table correspond to the GEOS-Chem data archives. For example, the first date of the GEOS-Chem "GEOS-FP" data archive begins on 01 Apr 2012, but GMAO was producing the "forward processing" data product for some time prior to this date.

--Bob Yantosca (talk) 18:44, 2 June 2017 (UTC)

Important notice from NASA/GMAO

Daniel Jacob wrote:

Dear GEOS-Chem user:

I write address some confusion about the different GEOS meteorological datasets produced by NASA GMAO and used by GEOS-Chem.

The two main data archives that you should use for your GEOS-Chem simulations are:

  1. The operational data stream from the GEOS Forward Processing (0.25° x 0.3125°, 72 levels) starting in 2012, which should be called GEOS-FP;
  2. The consistent MERRA-2 reanalysis for 1979-present (0.5° x 0.625°, 72 levels).

GEOS-Chem also supports older GEOS data sets including GEOS-4, GEOS-5, and MERRA. These are of inferior quality and GMAO does not want us to use them. They can still be useful to characterize model transport errors or the effects of different met fields for the same year, but should not be used for any other applications.

For more information see the GEOS-Chem narrative description at http://geos-chem.org/geos_chem_narrative.html

Daniel Jacob
02 Jun 2017

--Bob Yantosca (talk) 16:44, 2 June 2017 (UTC)

GEOS-5.0.1

Obsolete.jpg

NASA/GMAO ceased production of GEOS-5.0.1 data. We recommend that you use either GEOS-FP, which is the current operational GMAO met data product, or MERRA-2, which is the current GMAO reanalysis product. GEOS-5 will be de-supported in GEOS-Chem v11-02.

Support for GEOS-5 meteorology will be removed from v11-02d and later versions. GEOS-5 data will continue to be hosted on the Dalhousie shared data archive for the foreseeable future.

Overview

GMAO version number GEOS-5.0.1
Native resolution of archived met data 0.5° lat x 0.666° lon x 55 hybrid layers
Dates available 01 Dec 2003 to (approx.) 01 Jan 2007
Preceded by GEOS-4
Succeeded by GEOS-5.1.0
Included in this GEOS-Chem met archive GEOS-5
Currently used by GEOS-Chem? no
Notes From the Error in GEOS-5 Cloud Optical Depths post on the GEOS-5 issues wiki page:
Due to an oversight, the descriptions of the GEOS-5.1.0 met fields TAUCLI (ice-path optical depth) and TAUCLW (water-path optical depth) were incorrectly reported in the GEOS-5 v1 file specification document. These fields were listed as grid-box optical depths but were actually in-cloud optical depths.

Steven Pawson wrote:

I have now spoken to colleagues and have "definitive" information that the cloud optical depths (TAUCLW and TAUCLI) are for in-cloud optical depths only. They are not grid-box averages and to convert to grid-box averages you need to use the 3D cloud fraction, CLOUD.
This is a change from GEOS-4 (and 3) that is not documented in the GEOS-5.0.1 or 5.1.0 data description documents.
Steven
  • As a result of this error, we reprocessed all of the GEOS-5 met fields, and at the same time updated the data version from GEOS-5.0.1 to GEOS-5.1.0. This work was completed on 10 Jul 2009. For more information, please see our GEOS-5 met field reprocessing wiki page.
Supporting documents

--Bob Y. (talk) 18:48, 11 August 2015 (UTC)

GEOS-5.1.0

Obsolete.jpg

NASA/GMAO ceased production of GEOS-5.1.0 data. We recommend that you use either GEOS-FP, which is the current operational GMAO met data product, or MERRA-2, which is the current GMAO reanalysis product. GEOS-5 will be de-supported in GEOS-Chem v11-02.

Support for GEOS-5 meteorology will be removed from v11-02d and later versions. GEOS-5 data will continue to be hosted on the Dalhousie shared data archive for the foreseeable future.

Overview

GMAO version number GEOS-5.1.0
Native resolution of archived met data 0.5° lat x 0.666° lon x 55 hybrid layers
Dates available 01 Dec 2003 to (approx.) 02 Oct 2008
Preceded by GEOS-5.0.1
Succeeded by GEOS-5.2.0
Included in this GEOS-Chem met archive GEOS-5
Currently used by GEOS-Chem? yes
Notes
  • The prior version, GEOS-5.0.1 contained an error in the optical depth fields used by GEOS-Chem.
  • Furthermore, GEOS-5.1.0 contained several improvements in the convective fields (e.g. CMFMC, DTRAIN) used by GEOS-Chem with respect to GEOS-5.0.1.
  • Therefore we decided to "kill two birds with one stone", that is:
    • We updated to the newer GEOS-5.1.0 data product, and
    • Using the correct formulation for the optical depth fields, we created a new set of data files for GEOS-Chem covering the dates formerly spanned by the GEOS-5.0.1 data product.
  • As a result, all of the data in the GEOS-Chem "GEOS-5" met data archive is either GEOS-5.1.0 (prior to 01 Sep 2008) or GEOS-5.2.0 (01 Sep 2008 - June 2013).
Supporting documents

--Bob Y. (talk) 18:49, 11 August 2015 (UTC)

GEOS-5.2.0

Obsolete.jpg

NASA/GMAO ceased production of GEOS-5.2.0 data. We recommend that you use either GEOS-FP, which is the current operational GMAO met data product, or MERRA-2, which is the current GMAO reanalysis product. GEOS-5 will be de-supported in GEOS-Chem v11-02.

Support for GEOS-5 meteorology will be removed from v11-02d and later versions. GEOS-5 data will continue to be hosted on the Dalhousie shared data archive for the foreseeable future.

Overview

GMAO version number GEOS-5.2.0 (operational product)
Native resolution of archived met data 0.5° lat x 0.666° lon x 55 hybrid layers
Dates available 15 Aug 2008 to (approx.) 01 Jun 2013
Preceded by GEOS-5.2.0
Succeeded by GEOS-5.7.2
Included in this GEOS-Chem met archive GEOS-5
Currently used by GEOS-Chem? yes
Notes
  • GEOS-5.1.0 and GEOS-5.2.0 met data products were produced in parallel during the period 15 Aug 2008 thru 02 Oct 2008. This was done to assist users with the transition to GEOS-5.2.0.
  • The GEOS-Chem "GEOS-5" data archive uses the following versions.
    • Prior to 01 Sep 2008: GEOS-5.1.0
    • 01 Sep 2008 through June 2013: GEOS-5.2.0
    • Note that we chose to start using the GEOS-5.2.0 data files at the beginning of September 2008. This was done to avoid having 2 different met data products during the same month of August 2008. This would have complicated the interpretation of GEOS-Chem simulations.
Supporting documents

The following changes were made between GEOS-5.1.0 and GEOS-5.2.0:

Updates to the atmospheric GCM component

  1. A bug in cloudnew.F90 related to the use of the wind shear pdf was corrected.
  2. Updates were made in cloudnew.F90 to allow a) thicker cold low-level cloud and b) lower limits on RH in re-evaporation.
  3. Lowered the upper limit on RADQL and RADQI to 1 g/kg from 40 g/kg.
  4. A bug in MOIST was fixed to pressure weight DTDTFRIC.
  5. TROPP_THERMAL, TROPP_EPV, and TROPP_BLENDED options were implemented for Tropopause Pressure.
  6. The bounds for the relative humidity ramp for mass flux in RAS were changed from [0.6,0.8] to [0.5,0.65].
  7. The temperature perturbation in convective boundary layers was capped at 2ºK over the ocean and 4ºK over the land.
  8. Corrections were made to ALBEDO and SLRSFC calculations in GEOS_SolarGridComp.F90 and sorad.F. The LANDICEALBEDO was changed to 0.775 (from 0.8).
  9. The historical CO2 record is used.
  10. A gravity wave drag heating correction based on energy conversion from waves (rather than mean flow) was implemented.
  11. Modifications were made to thermal capacity of ice to allow diurnal cycle of surface temperature over land and sea ice.

Updates to the analysis

  1. The satellite bias correction was turned off for AMSU-A channel 14 and SSU channel 3.
  2. CRTM coefficients for AMSU and MSU, all channels for NOAA-8 and SSU channels for NOAA-11 were updated.
  3. A bug was fixed in the quality control of microwave instruments.

Other updates

  1. There is also one change to the GEOS-5 file specification document. This change is to correct a documentation error in the unit specification for the RH. In the file spec document, RH in product tavg3d_dyn_v is defined as having units of 'percent'. In fact, RH in this product is provided as a fraction between 0 and 1.

--Bob Y. (talk) 18:58, 14 July 2015 (UTC)

MERRA

Obsolete.jpg

The MERRA reanalysis product ceased in early 2016 and is now obsolete. We recommend that you use either GEOS-FP, which is the current operational GMAO met data product, or MERRA-2, which is the current GMAO reanalysis product. MERRA will be de-supported in GEOS-Chem v11-02.

Support for MERRA meteorology will be removed from v11-02d and later versions. MERRA data will continue to be hosted on the Dalhousie shared data archive for the foreseeable future.

Overview

GMAO version number GEOS-5.2.0 (MERRA reanalysis)
Native resolution of archived met data
  • 0.5° lat x 0.666° lon (surface fields)
  • 1° lat x 1.25° lon x 72 hybrid layers (3-D fields)
  • 1.25° lat x 1.25° lon x 42 pressure levels (certain 3-D fields, such as moist quantities)
Dates available 1979 - 2015
Preceded by GEOS-5.2.0 (operational product)
Succeeded by MERRA-2 (GEOS-5.12.4)
Included in this GEOS-Chem met archive MERRA
Currently used by GEOS-Chem? yes
Notes
  • MERRA is a 30-year (1979-2015) reanalysis product. This is a separate data product from the GEOS-5.1.0 and GEOS-5.2.0 operational data products. The MERRA file specification document states:
    • The Modern-Era Retrospective analysis for Research and Applications (MERRA) is a NASA atmospheric reanalysis for the satellite era using the Goddard Earth Observing System Model, Version 5 (GEOS-5) with its Atmospheric Data Assimilation System (ADAS), version 5.2.0. MERRA focuses on historical analyses of the hydrological cycle on a broad range of weather and climate time scales and places the NASA EOS suite of observations in a climate context. MERRA covers the period 1979-present, continuing as an ongoing climate analysis as resources allow. (NOTE: MERRA is scheduled to be turned off in mid-2015.)
  • MERRA data was generated in 3 separate data streams. The stream names are included in the names of the individual MERRA data files.
    • MERRA100: 1979-1992
    • MERRA200: 1993-2000
    • MERRA300: 2001-2015 (due to be turned off soon)
  • Several features of the MERRA data differ with respect to the GEOS-5.2.0 data, most notably:
Supporting documents

--Bob Y. (talk) 18:44, 11 August 2015 (UTC)

GEOS-5.7.2

Overview

GMAO version number GEOS-5.7.2
aka GEOS-5 FP or GMAO FP, where FP = "forward processing"
Native resolution of archived met data 0.25° lat x 0.3125° lon x 72 hybrid layers
Dates available 2011 - 11 Jun 2013
Preceded by GEOS-5.2.0
Succeeded by GEOS-5.11.0
Included in this GEOS-Chem met archive GEOS-FP
Currently used by GEOS-Chem? yes
Notes
  • To save disk space, GMAO only keeps the raw data files for a limited window (the past 6-8 months) on the public FTP server. After this time the data are archived to tape.
  • Several features of the GEOS-5.7.2 data differ with respect to the GEOS-5.2.0 data, most notably:
  • The GEOS-5.7.2 data structure is very similar to MERRA, with the following exceptions:
    • GEOS-5.7.2 data is stored as one file per collection per timestep (every 3h or 1h), but MERRA comes as one file per collection per day.
    • The GEOS-5.7.2 data has 3-hour instantaneous data, but MERRA has 6-hour instantaneous data.
  • The GEOS-5 FP forward processing data product was updated from GEOS-5.7.2 to GEOS-5.11.0 on June 11, 2013. GEOS-5.7.2 was discontinued after the delivery of the June 10th data.
Supporting documents

The following changes were added between GEOS-5.2.0 and GEOS-5.7.2:

Updates to atmospheric GCM component

  1. Stochastic Tokioka version of RAS (resolution-dependent stochastic limitation of cumulus entrainment).
  2. Modified MoistGridComp and cloudnew to locally decrease optical depths based on a sfc wind speed threshold. The main impact is over polar ice.
  3. Increase re-evap of snow and ice, overall decreased rates of autoconversion, and retuned radiative forcing to accommodate a wetter atmosphere.
  4. Turbulent surface layer parameterization changed to the Monin-Obukhov scheme.
  5. Turbulence: Inhibit action of Lock scheme in the presence of wind shear, increase overall action of Louis scheme near the surface, and implement a new Louis turbulence length scale based on PBL height.
  6. The option for a new z0 formulation over oceans was implemented. It increases the drag for moderate surface wind speeds and decreases it for hurricane strength winds.
  7. Removed viscous sub-layer over LAND, but viscous sub-layer included over LAKE, LANDICE, and SEA-ICE.
  8. Modified RHCRIT profile to a specified tanh profile, starting at 1.0 near the surface over oceans and turning near 800 mb to a resolution-dependant minimum value. Over land the near-surface value is also resolution-dependant and lower than over oceans.
  9. A new Gravity Wave Drag Parameterization capable of producing a QBO was implemented.
  10. New boundary datasets are introduced: an updated topography over Greenland, and new lai_green (leaf area index and greenness fraction), nirdf, and visdf (near infrared and visibile diffuse solar irradiance) datasets.
  11. Corrected bug in using the topo_TRB_var dateset (related to Turbulence VARFLT). The model had compensating errors which reduced the impact of using the variance**2 (rather than the variance).
  12. Added 5 m/sec maximum wind speed for VARFLT calculation to limit instabilitiexiii) Added guard in surfacelayer.F90 to prevent division by zero. Impact is very small due to limiting cases invoked when division by zero occurred.
  13. Modified surfacelayer.F90 to prevent creation of negative RHO due to small inconsistencies in sea-ice dataset.
  14. Fixed bug in GEOS_IrradGridComp.F90 to correct time-truncation error for updates (off by one step).
  15. Default CO2 set to 380 × 10-6.
  16. Latent Heat of Fusion constants have been updated to more accurate values.
  17. Total ozone (TO3) replaced by Total odd oxygen (TOX) in GCMPROG.rc.tmpl.
  18. Replaced lwi with model land fractions in HISTORY.rc.tmpl.

Updates to land surface component

  1. Fixed SPSNOW (Spurious Snow) diagnostic.
  2. Updates to MAPL_Constants, catch_constants, getcdh.code and catchment.F90. These updates attempt to reduce extreme cold temperatures over snow during clearsky nighttime conditions.
  3. Updates to GEOS_CatchGridComp and catchment.F90 fixed SNOW_DEPTH and SNOW_WATER_EQUIV interface error.

Updates to analysis

  1. The GSI was updated to accommodate new observing systems (IASI, GPSRO) using CRTM Release 2.0.2.
  2. The background error statistics were updated to those for GEOS-5 (gmao31Mar2009_fp+oz_fix)
  3. A vortex relocator was implemented.
  4. Fixed updating of ozone analysis increment. Previous versions (including MERRA incorrectly assumed the analysis increment was in mass-mixing-ratio. However, theanalysis provides ozone increments in volume-mixing-ratio.
  5. Enforced positive-definiteness of specific humidity, ozone, and cloud water condensate.
  6. The following observation changes were made:
    • GPS Refractivity from GRACE-A and METOP-GRAS
    • Cloud Drift winds (below 850 mb) from METEOSAT (EUMETSAT)
    • Cloud Drift winds (above 850 mb) from METEOSAT (EUMETSAT)
    • ASCAT added
    • Tightened gross check of all conventional observations (those in prepbufr); roughly most temperature observations had at least 1 K reduction in gross check error, and most wind observations about 1.5 m/s reduction.
  7. The window channels for AMSUA - 1,2,3 and 15 – were made passive.
  8. Radiosonde station 64650 (Bangui, Central African Rep.) was added to the

Other updates

  1. Output uses NetCDF4 (HDF5).
  2. Time-varying aerosols for radiation calculation input from GOCART coupled to GEOS-5.
  3. Aerosol assimilation provides aerosol updates

Validation

The following paper provides a detailed comparison of the GEOS-5.7.2 product (aka "Fortuna") compared to GEOS-5.2.0:

  1. Molod, A., L. Takacs, M. Suarez, J. Bacmeister, I. Song, and A. Eichmann, The GEOS-5 Atmospheric General Circulation Model: Mean Climate and Development from MERRA to Fortuna, Technical Report Series on Global Modeling and Data Assimilation, 28, Ed: Max J. Suarez, NASA GMAO, Goddard Space Flight Center, Greenbelt, MD, April 2012. (PDF)

--Bob Y. (talk) 13:01, 14 July 2015 (UTC)

GEOS-5.9.1

Overview

GMAO version number GEOS-5.9.1
aka GEOS-5 FP-IT or GMAO FP-IT, where FP-IT = "Forward Processing–Instrument Teams"
Native resolution of archived met data 0.5° lat x 0.625° lon x 72 hybrid layers
Dates available 2012 - present
Preceded by GEOS-5.7.2
Succeeded by ??
Included in this GEOS-Chem archive none
Currently used by GEOS-Chem? no
Notes
  • GEOS-5.9.1 is used to create the GEOS-5 FP-IT data product, which is a separate data stream from the GEOS-5 FP data product.
  • At present, the GEOS-5 FP-IT data product is not used by GEOS-Chem.
  • The updates listed below were also incorporated into the GEOS-5.11.0 version of the Data Assimilation System, which was used to create the GEOS-FP product from 11 Jun 2013 to 20 Aug 2014.
Supporting documents

Updates to atmospheric GCM component

  1. Model configuration updated to the cubed-sphere version of the horizontal grid.
  2. Code to calculate cloud optical depth was updated.
  3. IR and Solar radiance codes were updated to use older-style aerosol table lookups and to pass the calculated properties to the radiance code rather than the base table parameters themselves.
  4. A bug in in the clock associated with Solar Insolation Updates within PCHEM was fixed.

Updates to land surface component

  1. Land surface model boundary condition files (topography, LAI, greenness) were updated. MODIS albedo files are now used on a 16-day timescale rather than monthly.
  2. A bug in the timing of the monthly mean vegetation data (from GSWP-2) and greenness was fixed. These data had previously been introduced 15 days too early.
  3. The minimum soil depth was increased to 1.333 m (from 1 m).
  4. A bug that identified a very few low latitude tiles as tundra has been corrected. In previous versions, the SiB vegetation type "Dwarf Trees and Shrubs" was used to identify the LSM vegetation type "Dwarf Trees". Since this particular SiB type is available in small patches outside the Arctic Circle, the LSM now uses “Shrubs” outside the Arctic Circle (about 1.5% land tiles had been affected, but the overall effect in LSM calculations was much smaller).

Updates to analysis

  1. The analysis moisture variable was changed from q1 (specific humidity) to reformulated q2 (reformulated relative humidity).
  2. GSI was updated to accommodate Suomi-NPP, Meteosat SEVIRI, MetOp-B, tiros-n, Meteosat-10 winds, and MLS temperature and moisture retrievals (the last two in reanalysis mode). ATMS from Suomi-NPP is assimilated and the system is CrISready.
  3. Updates distinguish drifting buoy from other surface marine observations.#
  4. CRTM was updated to CRTM_REL-2.05.
  5. The GPSRO bending angle is assimilated instead of refractivity.
  6. The thinning box for infrared (AIRS, IASI, HIRS) observations was reduced from 180 km to 145 km
  7. The thinning box for MHS observations was reduced from 240 km to 145 km.
  8. MHS observation errors were inflated due to a misspecification of observation classification in the GSI namelist.

Other updates

  1. A bug in GOCART related to ZLE and PBL for CO and CO biomass burning was fixed. The previous code assumed ZLE was height above ground rather than height above sea-level.

--Bob Y. (talk) 19:03, 14 July 2015 (UTC)

GEOS-5.11.0

Overview

GMAO version number GEOS-5.11.0
aka GEOS-5 FP or GMAO FP, where FP = "Forward Processing"
Native resolution of archived met data 0.25° lat x 0.3125° lon x 72 hybrid layers
Dates produced 11 Jun 2013 to 20 Aug 2014
Preceded by GEOS-5.7.2 (with model updates from GEOS-5.9.1)
Succeeded by GEOS-5.13.0
Included in this GEOS-5 met archive GEOS-FP
Currently used by GEOS-Chem? yes
Notes
  • On June 11, 2013, the GMAO upgraded the real time GEOS-5 FP system from the current GEOS-5.7.2 to GEOS-5.11.0. As with the GEOS-5.7.2, the new system generated the data at 1/4 deg (lat) x 5/16 deg (lon) resolution and the data is accessible on the GSFC NCCS data portal.
  • The GEOS-5.7.2 data was discontinued after the delivery of June 10th data.
Supporting documents

The following changes were made to the Data Assimilation System between GEOS-5.9.1 and GEOS-5.11.0:

Updates to atmospheric GCM component

  1. The diagnostic PRECTOT = PCU+PLS+SNO, calculated from SURFACE, has been added.
  2. The diagnostic names in LANDICE for snow depth and snow mass have been modified to avoid blending within SURFACE.
  3. The albedo calculation over Arctic sea ice was updated to be seasonally varying.
  4. A bug in the H1000 diagnostic has been fixed.

Updates to land surface component

  1. A new landice component has been introduced that includes a snow model over land ice, improving the albedo calculation.

Updates to analysis

  1. Ozone background error statistics have been updated to be state-dependent.
  2. The capability to assimilate OMI total ozone with efficiency factors (averaging kernels) was added.
  3. The vertical length scales for ozone background error correlations were increased by a factor of 2 to give smoother profiles when MLS is assimilated.
  4. The MHS classification misspecification in the GSI namelist was corrected bringing observation errors to values consistent with 5.7.2 system. The thinning box mesh of 145 km was retained.

--Bob Y. (talk) 19:06, 14 July 2015 (UTC)

MERRA-2

Overview

GMAO version number GEOS-5.12.4 aka MERRA-2
Native resolution of archived met data 0.5° lat x 0.625° lon x 72 hybrid layers
Dates produced 01 Jan 1980 - present
Preceded by MERRA (reanalysis done with GEOS-5.2.0)
Succeeded by TBD
Included in GEOS-Chem met archives MERRA-2
Currently used by GEOS-Chem? yes
Notes
Supporting documents

--Bob Y. (talk) 18:59, 11 August 2015 (UTC)

Updates to analysis

Text to be added

Other updates

Text to be added

--Bob Y. (talk) 18:13, 11 August 2015 (UTC)

GEOS-5.13.0

Overview

GMAO version number GEOS-5.13.0
aka GEOS-5 FP or GMAO FP, where FP = "forward processing"
Native resolution of archived met data 0.25° lat x 0.3125° lon x 72 hybrid layers
Dates produced 20 Aug 2014 - 01 May 2015
Preceded by GEOS-5.11.0
Succeeded by GEOS-5.13.1
Included in GEOS-Chem met archive GEOS-FP
Currently used by GEOS-Chem? yes
Notes
  • The system switch from GEOS-5.11.0 to GEOS-5.13.0 was made starting with FP data produced on August 20 at 06:00 UTC.
Supporting documents

--Bob Y. (talk) 19:16, 11 August 2015 (UTC)

Updates to analysis

GMAO upgraded the GEOS-5 Forward Processing (FP) system to GEOS-5.13 on August 20, 2014. The new version has a new capability to process additional input observation types, such as MLS ozone, METOP-B AMSUA, METOP-B IASI, METOP-B MHS, CRIS, SSMIS, and GOES sounder. The addition of these new instruments along with updates to the model and analysis components is expected to improve the scientific quality of the data.

Other updates

The file format is unchanged with one minor exception. In the GEOS-5.13 products, the netCDF "time" dimension is now UNLIMITED, although as before, each file contains only one timestep. In the past, this dimension variable was finite of length 1. We do not anticipate that this will have any computational impact on your systems. If you are interested in viewing or testing the data in advance of the upgrade, you can do so until the day prior to the upgrade at the location listed below.

--Bob Y. (talk) 19:13, 14 July 2015 (UTC)

GEOS-5.13.1

Overview

GMAO version number GEOS-5.13.1
aka GEOS-5 FP or GMAO FP, where FP = "forward processing"
Native resolution of archived met data 0.25° lat x 0.3125° lon x 72 hybrid layers
Dates produced 01 May 2015 - 24 Jan 2017
Preceded by GEOS-5.13.0
Succeeded by GEOS-5.16.5
Included in GEOS-Chem met archives GEOS-FP
Currently used by GEOS-Chem? yes
Notes
Supporting documents

--Bob Y. (talk) 19:01, 11 August 2015 (UTC)

Updates to analysis

GMAO upgraded the GEOS-5 Forward Processing (FP) system to a new GEOS-5 version that employs a Hybrid 3D Var analysis scheme. The background error covariance formulation used to produce the analysis now includes a flow-dependent component, obtained from an Ensemble Kalman Filter (EnKF) coupled to the GSI. An enhancement to the forecast model parameterization of surface drag was also included in this upgrade.

The variable collections that were generated by the previous version continue to be generated by the new system without any change to the file format. So we expect there will be minimal, if any, technical impact on the FP data users.

The system switch was made starting with FP data produced for 06:00 UTC of May 1st.

--Bob Y. (talk) 18:30, 11 August 2015 (UTC)

GEOS-5.16.5

Overview

GMAO version number GEOS-5.16.5
aka GEOS-5 FP or GMAO FP, where FP = "forward processing"
Native resolution of archived met data 0.25° lat x 0.3125° lon x 72 hybrid layers
Dates produced 24 Jan 2017- present
Preceded by GEOS-5.13.1
Succeeded by TBD
Included in GEOS-Chem met archives GEOS-FP
Currently used by GEOS-Chem? yes
Notes
  • Additional variables have been added to the inst3_3d_aer_Nv, inst3_3d_asm_Np, inst3_3d_asm_Nv, tavg1_2d_ocn_Nx, tavg3_2d_aer_Nx, and tavg3_2d_adg_Nx collections.
  • Total daily data size (for all collections) has increased from 67 GB/day to 78 GB/day.
Supporting documents

--Bob Yantosca (talk) 18:51, 2 June 2017 (UTC)

References

The information presented on this page was compiled from the following resources:

  1. GMAO Products Page (gmao.gsfc.nasa.gov/products)
  2. Overview of GMAO met data products page on the GEOS-Chem wiki
  3. GEOS-5.2.0 page on the GEOS-Chem wiki
  4. GEOS-5 issues page on the GEOS-Chem wiki
  5. GEOS-5 met field reprocessing page on the GEOS-Chem wiki
  6. GEOS-FP page on the GEOS-Chem wiki
  7. MERRA page on the GEOS-Chem wiki
  8. MERRA-2 page on the GEOS-Chem wiki
  9. List of GEOS-FP met fields for GEOS-Chem
  10. List of MERRA met fields for GEOS-Chem
  11. List of MERRA-2 met fields for GEOS-Chem
  12. Information about implementing GEOS-FP into GEOS-Chem
  13. Information about implementing MERRA into GEOS-Chem
  14. Information about implementing MERRA-2 into GEOS-Chem
  15. Glossary of variables produced by the GEOS-DAS
  16. M.M. Rienecker, M.J. Suarez, R. Todling, J. Bacmeister, L. Takacs, H.-C. Liu, W. Gu, M. Sienkiewicz, R.D. Koster, R. Gelaro, I. Stajner, and J.E. Nielsen, The GEOS-5 Data Assimilation System—Documentation of Versions 5.0.1, 5.1.0, and 5.2.0, Technical Report Series on Global Modeling and Data Assimilation, 27, Ed: Max J. Suarez, NASA GMAO, Goddard Space Flight Center, Greenbelt, MD, December 2008. (PDF)
  17. Molod, A., L. Takacs, M. Suarez, J. Bacmeister, I. Song, and A. Eichmann, The GEOS-5 Atmospheric General Circulation Model: Mean Climate and Development from MERRA to Fortuna, Technical Report Series on Global Modeling and Data Assimilation, 28, Ed: Max J. Suarez, NASA GMAO, Goddard Space Flight Center, Greenbelt, MD, April 2012. (PDF)
  18. Details about versions from GEOS-5.2.0 thru GEOS-5.11.0 (memo from GMAO)
  19. README for the upgrade to GEOS-5.11.0 (memo from GMAO)

--Bob Y. (talk) 19:16, 14 July 2015 (UTC)