The netCDF files contain monthly or annual values for each grid cell over the contiguous United States. Backgroud cells containing no data are represented as missing with -9999.0. The order of the grid cells is west to east, north to south. Each grid cell is 0.5 degree latitude by 0.5 degree longitude. The data values are given for the center of the grid cell.
Many options exist to edit, display, and analyze data in netCDF format.
Other software programs are available to display and edit netCDF files on a variety of platforms. This dataset is based on the spline fit of Mauna Loa and ice core data from Enting et al. The data start in 1765. If you have technical problems or questions about these files, please contact Cristina Kaufman or Nan Rosenbloom. The netCDF source is freely available and can be obtained as a compressed tar file or a zip file from Unidata.