This directory contains the input files for applying linearized stratospheric chemistry production and loss in strat_chem_mod.F90 (ltm, Jun 25, 2012). Each netcdf file contains the following variables (shown here for NOx): > ncdump -h gmi.clim.NOx.geos5.4x5 netcdf gmi.clim.NOx.geos5.4x5 { dimensions: eta = 72 ; etap1 = 73 ; latitude = 46 ; longitude = 72 ; time = 12 ; variables: float latitude(latitude) ; latitude:units = "degrees" ; float longitude(longitude) ; longitude:units = "degrees" ; float am(eta) ; am:units = "mb" ; am:long_name = "Hybrid pressure term" ; float bm(eta) ; bm:units = "unitless" ; bm:long_name = "Hybrid sigma term" ; float pmid(eta) ; pmid:long_name = "Mean pressure of level" ; pmid:units = "mb" ; float zmid(eta) ; zmid:long_name = "Mean altitude of level" ; zmid:units = "km" ; float ai(etap1) ; ai:units = "mb" ; ai:long_name = "Hybrid pressure edge term" ; float bi(etap1) ; bi:units = "unitless" ; bi:long_name = "Hybrid sigma edge term" ; short month(time) ; month:units = "month" ; float species(time, eta, latitude, longitude) ; species:units = "v/v" ; species:lon_name = "NOx mixing ratio" ; float prod(time, eta, latitude, longitude) ; prod:units = "v/v/s" ; prod:long_name = "NOx production rate" ; float loss(time, eta, latitude, longitude) ; loss:units = "s^-1" ; loss:long_name = "NOx loss frequency" ; } They are the 3D climatological monthly mean production rates, loss frequencies, and concentrations for each species simulated by the GMI "Combo" model. GMI archives the reaction rates for each kinetic and photolysis reaction, which have been stoichiometrically summed for each individual species, and averaged over all years by L. Murray (ltmurray@post.harvard.edu) In addition to individual species, prod rates and loss frequencies were determined for the NOx family (= N + NO + NO2 + NO3 + HNO2 ) and Ox family (= O + O1D + O3). Ox was determined for completeness, only Linoz or Synoz are actually used by or recommended for GEOS-Chem. The GEOS-5X/MERRA files are the 2004-2010 monthly means from archived GMI output at ftp://dirac.gsfc.nasa.gov/pub/gmidata2/users/steenrod/MERRA The GEOS4 files are the 2004-2007 monthly means from archived GMI output at ftp://dirac.gsfc.nasa.gov/pub/gmidata2/users/mrdamon/Aura4-Final GMI and GEOS-Chem has different GEOS-4 vertical resolutions, so we regrid those vertically. The files and new strat chem scheme are described in detail on the GEOS-Chem wiki page at http://wiki.seas.harvard.edu/geos-chem/index.php/Stratospheric_chemistry References: GEOS-Chem Implementation: Murray, L.T., D.J. Jacob, J.A. Logan, R.C. Hudman, and W.J. Koshak, Optimized regional and interannual variability of lightning in a global chemical transport model constrained by LIS/OTD satellite data, submitted to J. Geophys. Res., 2012. Murray, L.T., J.A. Logan, D.J. Jacob, J.A. Logan, The role of lightning in driving interannual variability in tropical tropospheric ozone and OH, in prep. GMI Combo Model: Allen, D., K. Pickering, B. Duncan, and M. Damon (2010), Impact of lightning NO emissions on North American photochemistry as determined using the Global Modeling Initiative (GMI) model, J Geophys Res-Atmos, 115, doi: 10.1029/2010JD014062. Considine, D. B., J. A. Logan, and M. A. Olsen (2008), Evaluation of near-tropopause ozone distributions in the Global Modeling Initiative combined stratosphere/ troposphere model with ozonesonde data, Atmos Chem Phys, 8(9), 2365–2385. Duncan, B. N., J. A. Logan, I. Bey, I. A. Megretskaia, R. M. Yantosca, Novelli, P. C., N. B. Jones, and C. P. Rinsland (2007), Global budget of CO, 1988-1997: Source estimates and validation with a global model, J Geophys Res-Atmos, 112, doi: 10.1029/2007JD008459.