README -- describes contents of MODIS_LAI_201204/For_Olson_2001 directory 16 Jul 2015 GEOS-Chem Support Team geos-chem-support@g.harvard.edu ############################################################################### ### NOTE: These files are at the same native resolution (0.25 x 0.25 ### ### GENERIC GRID) as the Olson 2001 landmap. You must use these files if ### ### you are using the Olson 2001 landmap option in GEOS-Chem. ### ############################################################################### MODIS leaf area index (LAI) data: =============================================================================== Data for actual years 2005-2008: ------------------------------------------------- MODIS.LAIv.V5.generic.025x025.2005.nc MODIS.LAIv.V5.generic.025x025.2006.nc MODIS.LAIv.V5.generic.025x025.2007.nc MODIS.LAIv.V5.generic.025x025.2008.nc -- Monthly MODIS leaf area indices (for years 2005-2008) Resolution : 0.25 x 0.25 GENERIC grid (1440 x 720 grid boxes) Units : cm2 leaf / cm2 grid box Compression : Level 1 (e.g. nccopy -d1) Timestamps: : Monthly, YYYY/01/01 through YYYY/12/01, where YYYY is the year listed in the file name -- NOTE: Data for 2009 has not been adequately validated but is kept for backwards compatibility since it is used in older versions of GEOS-Chem (e.g. v9-02). MODIS Chlorophyll-A files: =============================================================================== Data corresponding to actual years (2005-2014): ------------------------------------------------- MODIS.CHLRv.V5.generic.025x025.2005.nc MODIS.CHLRv.V5.generic.025x025.2006.nc MODIS.CHLRv.V5.generic.025x025.2007.nc MODIS.CHLRv.V5.generic.025x025.2008.nc MODIS.CHLRv.V5.generic.025x025.2009.nc MODIS.CHLRv.V5.generic.025x025.2010.nc MODIS.CHLRv.V5.generic.025x025.2011.nc MODIS.CHLRv.V5.generic.025x025.2012.nc MODIS.CHLRv.V5.generic.025x025.2013.nc MODIS.CHLRv.V5.generic.025x025.2014.nc -- Monthly MODIS-Aqua Chlorophyll-A data Provided by Matthew Johnson Email: matthew.s.Johnson@nasa.gov Resolution : 0.25 x 0.25 GENERIC grid (1440 x 720 grid boxes) Units : mg m-3 Compression : Level 1 (e.g. nccopy -d1) Timestamps: : Monthly, YYYY/01/01 through YYYY/12/01, where YYYY is the year listed in the file name For other dates, we provide climatological data: -------------------------------------------------- MODIS.CHLRv.V5.generic.025x025.Clim.nc -- Climatological MODIS Aqua Chl-a on the 0.25 x 0.25 GENERIC GRID. Provided by Matthew Johnson Email: matthew.s.Johnson@nasa.gov Resolution : 0.25 x 0.25 GENERIC grid (1440 x 720 grid boxes) Units : mg m-3 Compression : Level 1 (e.g. nccopy -d1) Timestamps: : Monthly, YYYY/01/01 through YYYY/12/01, where YYYY is the year listed in the file name NOTES about MODIS Chlorophyll-A files: -------------------------------------------------- (1) These files are at the same native resolution (0.25 x 0.25 GENERIC GRID) as the Olson 2001 landmap. The marine oraganic aerosol emission code is designed to regrid and apply CHLR files similar to the way LAI files are used. (2) NOTE: At present the CHLR data files are not read via HEMCO, but this may be done in a later update. Before this can be done, however, the units must first be changed to kg/m3 for compatibility with HEMCO. (bmy, 7/16/15) Post-processed data used for GEOS-Chem GCHP: -------------------------------------------------- Directories: XLAI_for_GCHP/$YYYY XCHLR_for_GCHP/$YYYY ====================== For GCHP v11-02b only: ====================== We post-processed of the MODIS LAI data (2005-2008) and CHLR data (2005-2014) in November 2016 for compatibility with the ExtData component of the MPI-compatible version of GEOS-Chem (GCHP). Monthly files are stored in year directories within the XLAI_for_GCHP and XCHLR_for_GCHP directories as listed above. Unlike the original files which contain twelves months of data per file, the post-processed files are monthly. All files are compressed at level 1 (e.g. nccopy -d1) to match the compression of the original files. Each file contains one variable per Olson 2001 land type (0-72). Variable names have the following format: XLAI00, XLAI01, ..., XLAI72 for LAI, and XCHLR00, XCHLR01, ..., XCHLR72 for CHLR. For each variable, values match the values in the original file for grid cells with the variable's land type in the Olson file. Values are zero for all other grid cells. For example, XLAI04 will have original LAI values for all grid cells with Olson 2001 land type 4, and zeros elsewhere. Years without original data contain symbolic links to the nearest year with data. For example, 2002 files will symbolically link to 2005 data for both LAI and CHLR. XLAI data for actual years 2005-2008: File format : MODIS.XLAI.025x025.YYYYMM.nc Resolution : 0.25 x 0.25 GENERIC grid (1440 x 720 grid boxes) Units : cm2 leaf / cm2 grid box Compression : Level 1 (e.g. nccopy -d1) Timestamps: : Single month YYYY/MM/01 where YYYY and MM are the year and month listed in the file name -- NOTE: Original data for 2009 has not been adequately validated and therefore is not used for GCHP. XCHLR data for actual years 2005-2014: File format : MODIS.XCHLR.025x025.YYYYMM.nc Resolution : 0.25 x 0.25 GENERIC grid (1440 x 720 grid boxes) Units : mg m-3 Units : cm2 leaf / cm2 grid box Compression : Level 1 (e.g. nccopy -d1) Timestamps: : Single month YYYY/MM/01 where YYYY and MM are the year and month listed in the file name =========================== For GCHP v11-02c and later: =========================== Same as above in the v11-02b section except that we took that processed data and transformed it to reduce monthly files to each contain one variable. The single variable has land type as a third dimension. This enable ExtData to read the file once for all of the information needed, rather than open and read the file for each of the land types. Filenames are the same as above except with prefix "Condensed_". ~ Lizzie Lundgren, 11/6/2017