README -- Describes contents of HEMCO/CO2/v2022-11/OCEAN 30 Nov 2022 GEOS-Chem Support Team geos-chem-support@g.harvard.edu Overview: =============================================================================== This directory contains the annual and monthly mean oceanic exchange data from Takahashi et al. (2009) which have been scaled with atmospheric data for 2000- 2013 as described in that paper. These are used for the GEOS-Chem CO2 simulation. Ray Nassar provided the original files. Bob Yantosca edited the files for better COARDS compliance. Files: =============================================================================== Scaled_Ocean_CO2_monthly.nc -- Scaled Ocean CO2 flux from Takahashi et al. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% Note: This file contains the same Takahashi data as in %%% %%% HEMCO/CO2/v2019-12/OCEAN/Scaled_Ocean_CO2_monthly.nc. However, %%% %%% the "lon" dimension has been changed from type "int" to type %%% %%% "float". This is necessary because GCHP cannot read netCDF data %%% %%% of type "int". %%% %%% %%% %%% This modification was done with the netCDF Operators (NCO): %%% %%% %%% %%% $ ncap2 -s 'lon=float(lon)' Scaled_Ocean_CO2_monthly.nc tmp.nc %%% %%% $ mv tmp.nc Scaled_Ocean_CO2_monthly.nc tmp.nc %%% %%% %%% %%% Also, the reference date ("time:units") has been edited to match %%% %%% the first time value (needed for GCHP). The commands were: %%% %%% %%% %%% $ cdo setreftime,2000-01-01 Scaled_Ocean_CO2_monthly.nc tmp.nc %%% %%% $ mv tmp.nc Scaled_Ocean_CO2_monthly.nc tmp.nc %%% %%% $ nc_chunk.pl Scaled_Ocean_CO2_monthly.nc 1 %%% %%% %%% %%% -- Bob Yantosca (30 Nov 2022) %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Resolution : GCAP 4 x 5 grid (72 x 45 boxes) Units : kg/m2/s Timestamps : Monthly, 2000/01/01 thru 2013/12/01 Compression : Level 1 (e.g. nccopy -d1) Taka2009_CO2_Annual.nc -- Annual mean CO2 ocean exchange from Takahashi et al (2009). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% Note: This file contains the same Takahashi data as in %%% %%% HEMCO/CO2/v2014-09/OCEAN/Taka2009_CO2_Annual.nc. However, the %%% %%% reference date ("time:units") has been edited to match the first %%% %%% time value. This is a requirement for GCHP. The commands were: %%% %%% %%% %%% $ cdo setreftime,2000-01-01 Taka2009_CO2_Annual.nc tmp.nc %%% %%% $ mv tmp.nc Taka2009_CO2_Annual.nc tmp.nc %%% %%% $ nc_chunk.pl Taka2009_CO2_Annual.nc 1 %%% %%% %%% %%% -- Bob Yantosca (30 Nov 2022) %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Resolution : GEOS-Chem 2 x 2.5 grid Units : kg m-2 s-1 Timestamps : 2000/01 Compression : Level 1 (e.g. nccopy -d1) Taka2009_CO2_Monthly.nc -- Monthly mean CO2 ocean exchange from Takahashi et al (2009). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% Note: This file contains the same Takahashi data as in %%% %%% HEMCO/CO2/v2014-09/OCEAN/Taka2009_CO2_Monthly.nc. However, the %%% %%% reference date ("time:units") has been edited to match the first %%% %%% time value. This is a requirement for GCHP. The commands were: %%% %%% %%% %%% $ cdo setreftime,2000-01-01 Taka2009_CO2_Monthly.nc tmp.nc %%% %%% $ mv tmp.nc Taka2009_CO2_Monthly.nc tmp.nc %%% %%% $ nc_chunk.pl Taka2009_CO2_Monthly.nc 1 %%% %%% %%% %%% -- Bob Yantosca (30 Nov 2022) %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Resolution : GEOS-Chem 2 x 2.5 grid Units : kg m-2 s-1 Timestamps : Monthly, 2000/01 thru 2000/12 Compression : Level 1 (e.g. nccopy -d1) References: =============================================================================== Takahashi, T., et al., "Climatological mean and decadal change in surface ocean pCO2, and net seaair CO2 flux over the global oceans", Deep-Sea Res. II, doi:10.1016/j.dsr2.2008.12.009, 2009. Also see our wiki page: http://wiki.geos-chem.org/CO2_simulation