README -- Describes contents of HEMCO/CO2/v2015-04/BIO 04 Sep 2015 GEOS-Chem Support Team geos-chem-support@g.harvard.edu Overview: =============================================================================== This directory contains biospheric data archived from multiple sources. These are needeed by the GEOS-Chem CO2 simulation. Original data files were supplied by Ray Nassar. Bob Yantosca edited the files for better COARDS compliance. Files: =============================================================================== CASA_diurnal_CO2_fix.nc -- Daily balanced Net Ecosystem Production (NEP) CO2 fluxes with a diurnal cycle imposed. These are archived from the CASA model. Resolution : GEOS-Chem 2 x 2.5 grid (144 x 91 boxes) Units : kg/m2/s Timestamps : Every 3 hours from 1985/01/01 thru 1985/12/31 Compression : Level 1 (e.g. nccopy -d1) %%%% NOTE from Ray Nassar (04 Sep 2015) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% This file (CASA_diurnal_CO2_fix.nc) has been reprocessed to replace an error in the currently available version. The problem in that file was first discovered by Zhaocheng Zeng (in Hong Kong, CCed) and he contacted me for help to try to figure out why his v10 run crashed. Together we tracked down the problem. To make a long story short, the netCDF file that Christoph created was based on CASA bpch files from Parv from back in 2005. For some reason, the file for day of year 189 was renamed to “nep.geos.2x25.189.orig” and the file for day 188 was copied and renamed to “nep.geos.2x25.189” so there was a resulting glitch in the date-times in the netCDF file since actual date-times for day 189 were missing, and day 188 appeared twice. My version of the v10 code somehow still worked fine despite this, but his did not. I don’t know the initial motivation for the file renaming, but I have now used day 189.orig to create a new netCDF file so there are no oddities with dates in the file. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% CASA_diurnal_CO2.nc -- Daily balanced Net Ecosystem Production (NEP) CO2 fluxes with a diurnal cycle imposed. These are archived from the CASA model. Resolution : GEOS-Chem 2 x 2.5 grid (144 x 91 boxes) Units : kg/m2/s Timestamps : Every 3 hours from 1985/01/01 thru 1985/12/31 Compression : Level 1 (e.g. nccopy -d1) %%% NOTE: Use the new file CASA_diurnal_CO2_fix.nc %%% SiB3_3hr_NEP.nc -- SiB3 balanced Net Ecosystem Production (NEP) CO2 from Nick Parazoo Resolution : GEOS-Chem 1 x 1.25 grid (288 x 181 boxes) Units : kg/m2/s Timestamps : Every 3 hours from 2006/01/01 thru 2006/12/31 Compression : Level 1 (e.g. nccopy -d1) Net_terrestrial_exch_5.29Pg.generic.1x1.nc -- Net terrestrial exchange based on Transcom 3 climatology (1991-2000), minus the GFEDv2 climatology (1997-2007) described in Nassar et al. (2010) Resolution : GENERIC 1 x 1 grid Units : kg/m2/s Timestamps : 2000/01/01 Compression : Level 1 (e.g. nccopy -d1) NOTE from Ray Nassar (04 Sep 2015): File References: =============================================================================== CASA daily averaged data: Data Source: CASA gridded (1x1) dataset for from M. Thompson Monthly values interpolated to daily values : 365 daily files NB : These files DO NOT have the diurnal cycle in daily emissions CASA data with diurnal cycle imposed: Olsen, S. C., and J. T. Randerson, "Differences between surface and column atmospheric CO2 and implications for carbon cycle research", J. Geophys. Res., 109, D02301, doi:10.1029/2003JD003968, 2004. Potter, C. S., J. T. Randerson, C. B. Field, P. A. Matson, P. M. Vitousek, H. A. Mooney, and S. A. Klooster, "Terrestrial ecosystem production: A process model based on global satellite and surface data", Global Biogeochem. Cycles, 7, 811841, 1993. Simple Biosphere Model 3 (SiB3): Messerschmidt, J., N. Parazoo, N.M. Deutscher, C. Roehl, T. Warneke, P.O. Wennberg, and D. Wunch (2012) Evaluation of atmosphere-biosphere exchange estimations with TCCON measurements, Atmos. Chem. Phys. Discussions, 12, 12759-12800, doi:10.5194/acpd-12-12759-2012. Net Terrestrial Exchange: Baker, D.F. et al. (2006) TransCom3 inversion intercomparison: Impact of transport model errors on the interannual variability of regional CO2 fluxes, 1998-2003, Global Biogeochem., Cy., 20, GB1002, doi:10.29/2004GB002439. Nassar, R., D.B.A. Jones, P. Suntharalingam, J.M. Chen, R.J. Andres, K.J. Wecht, R.M. Yantosca, S.S. Kulawik, K.W. Bowman, J.R. Worden, T. Machida and H. Matsueda (2010), Modeling global atmospheric CO2 with improved emission inventories and CO2 production from the oxidation of other carbon species, Geoscientific Model Development, 3, 689-716. Also see our wiki page: http://wiki.geos-chem.org/CO2_simulation