CGEIC Two Level, Seasonal SOx/NOx Global Emissions Inventory (GEIA Global SOx/NOx Inventory, Version 1B) 97/04/07 This file contains information about the Sulphur and Nitrogen data sets available on the CGEIC web site. This inventory is referred to as the "Global Emissions Inventory Activities (GEIA) Version 1B, sulphur and nitrogen global inventory". Details of the regional and national data sets used in the compilation of this seasonal, two elevation level, global emissions data set are available in Benkovitz Carmen M., M. Trevor Scholtz, Jozef Pacyna, Leonor Tarrason, Jane Dignon, Eva C. Voldner, Peter A. Spiro, Jennifer A. Logan and T. E. Graedel, Global gridded inventories of anthropogenic emissions of sulphur and nitrogen, J. Geophysical Research, 101 (22), pp29,239 - 29,253, (1996). The emission inventory described in this reference is known as the "GEIA 1A, sulphur and nitrogen global emission inventory". The Version 1A gives gridded total annual emission. The Versions 1A and 1B were prepared in parallel using exactly the same regional and global data sets. The global totals, obtained by collapsing the two level 1B inventory into a single total, differ only slightly due to differences in merging national data sets. For the 1B inventory, the extent to which the emissions for individual countries could be resolved into high and low emission heights and seasons varied between data sets (see notes below) low_nit.prn - low elevation level (<100m) emissions of Nitrogen low_sul.prn and Sulphur in tonne per year with associated seasonal factors (as fractions) for each grid. Sources of low elevation level emissions are i) mobile area sources ii) non-mobile area sources iii) area source-minor points iv) uncategorized anthropogenic sources There are 10027 records in each of low_nit.prn and low_sul.prn Sums, in tonne, for each of the variables: Nitrogen Sulphur ---------- ---------- 15,013,745 24,032,243 high_nit.prn - high elevation level (>100m) emissions of Nitrogen high_sul.prn and Sulphur in tonne per year with associated seasonal factor for each grid. Sources of these high level emissions are i) points - power plants ii) points - smelters iii)points - other major point sources There are 4531 records in each of high_nit.prn and high_sul.prn. Sums, in tonne, for each of the variables: Nitrogen Sulphur ---------- ---------- 5,999,104 42,937,710 Low_nit.prn, high_nit.prn (nitrogen) and low_sul.prn, high_sul.prn (sulphur)are comma delimited files, each having the following field (column) structure: Grid, Emission, Winter Spring Summer Fall (sulphur Seasonal Seasonal Seasonal Seasonal or nitrogen, Factor, Factor, Factor, Factor in tonnes). NOTES: ------ 1. Point sources such as power plants, smelters and other major point sources of SOx and NOx are assumed to have a physical stack height and sufficient buoyant plume rise that the emissions are transport in the atmosphere above 100 m. Since not all regional and national inventories had sufficient information to enable a split to be made between high and low elevation sources, some grids lack high level data and all emissions are reported in the low level file. 2. Seasonal variability of emissions is available for only a few areas of the globe (western Europe, United States and Canada, for example). Where seasonal data are not available, emissions have been distributed equally between the four seasons. 3. Where sufficient temporal datail is available, the seasons are defined as winter (summer in southern hemisphere) December-February, spring (fall) March-May, summer (winter) June-August and fall (spring) September-November. Definition of Grid Number: -------------------------- Grid Number The GEIA grid is used, which is a 180x360 grid with 1 degree latitude x 1 degree longitude cells. The latitude - longitude coordinates of a cell are those of the southwest corner of the grid cell. Note: Only grid cells which contain emissions are included in this file. Grid cell numbers are a packed integer representing both latitude and longitude as described below: Grid number= (latitude+91)*1000+(longitude+181) The origin, packed cell number 1001 for this grid system is located at the lower left edge of the grid, which corresponds to -90 degrees latitude, -180 degrees longitude. To unpack the grid number into Latitude and Longitude follow these steps: 1) Divide Grid Number by 1000 example: 1003 / 1000 = 1.003 2) To calculate Latitude take the integer portion of the number in Step 1) and subtract 91. example: Latitude = 1 - 91 = -90 degrees latitude 3) To calculate Longitude take the decimal portion of the number in Step 1) and multiply by 1000 (e.g. 1.003 = 3) and subtract 181. example: Longitude = 3 - 181 = -178 degrees longitude ********************************************************************* HAVE YOU REGISTERED? If you have not already done so, please take a moment to register with us at our CGEIC web site. 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