Monthly Fossil-Fuel CO2 Emissions: Mass of Emissions Gridded by One Degree Latitude by One Degree Longitude R.J. Andres and T.A. Boden Carbon Dioxide Information Analysis Center Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge, Tennessee 37831-6290 U.S.A. G. Marland Research Institute for Environment, Energy, and Economics Appalachian State University Boone, NC 28608 USA DOI: 10.3334/CDIAC/ffe.MonthlyMass.2012 Period of Record --------------------- 1950-2009 Methods ----------- The basic data provided in these data files are derived from time series of Global, Regional, and National Fossil-Fuel CO2 Emissions (http://cdiac.ess-dive.lbl.gov/trends/emis/overview_2009.html), the references therein, and the methodology described in Andres et al. (2011). The data accessible here take these tabular, national, mass-emissions data and distribute them spatially on a one degree latitude by one degree longitude grid. The within-country spatial distribution is achieved through a fixed population distribution as reported in Andres et al. (1996). Note that the mass-emissions data used here are based on fossil-fuel consumption estimates as these are more representative of within country emissions than fossil-fuel production estimates (see http://cdiac.ess-dive.lbl.gov/faq.html#Q10 for a description why emission totals based upon consumption differ from those based upon production). Data File Structure and Naming Convention ---------------------------------------------------- There is a separate data file for each year and month. The files have a basename of gridcar and an extension of yyyymm where yyyy is the year (e.g., 2000) and mm is the month (e.g., ranging from 01 for January to 12 for December). The unit of the mass data portrayed is 10E3 metric tonnes of C or Gg C (Gg=10E9 g). Two identical sets of data are available: 1. Compressed gridcar.yyyymm.Z files (one file for each year and month). These files were compressed using the standard unix compression utility to speed downloading. You will need to uncompress them using the unix "uncompress *" command), and 2. One tar file (gridcar.monthly.tar) file which contains all 720 files in a compressed state. Before using the files, users will need to extract the files from the tar file using the "tar xvf gridcar.monthly.tar" command and then uncompress the resulting files using the unix "uncompress *" command. We suggest the data should be plotted before directly incorporating the data into a model or other use. If read in correctly, the data should plot a map of the world with North at the top and East to the right. On each line, the data go from the 180-179 degrees west cell to the 179-180 degrees east cell until reading in the next line of data. In FORTRAN, the data were written with: parameter (maxlat=180, maxlon=360) C DISTRIBUTE C ON GRID do 1200, i=1, maxlat do 1200, j=1, maxlon write (14, 1310) gridcar (i,j) 1200 continue 1310 format (ES13.6E2) In addition to the monthly gridcar.* files, there are 12 SUMMARYmm.MASS.DAT files (where mm follows the same naming convention as with the gridcar files). These summary files contain the year, the minimum grid cell value, the maximum grid cell value, and the sum of the grid cell values. This file is included as an additional means to check that the gridcar.* files have been read correctly. Reference ------------ Andres RJ, Marland G, Fung I, and Matthews E (1996) A one degree by one degree distribution of carbon dioxide emissions from fossil fuel consumption and cement manufacture, 1950-1990. Global Biogeochemical Cycles 10:419-429. doi:10.1029/96GB01523. Andres RJ, Gregg JS, Losey L, Marland G, and Boden TA (2011) Monthly, global emissions of carbon dioxide from fossil fuel consumption. Tellus B, 63:309-327. doi: 10.1111/j.1600-0889.2011.00530.x. CITE AS: Andres, R.J., T.A. Boden, and G. Marland. 2012. Monthly Fossil-Fuel CO2 Emissions: Mass of Emissions Gridded by One Degree Latitude by One Degree Longitude. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn., U.S.A. doi: 10.3334/CDIAC/ffe.MonthlyMass.2012