Bales, R.C., J.R. McConnell, E. Mosley-Thompson, and G. Lamorey. 2001. Accumulation map for the Greenland Ice Sheet: 1971-1990. Geophysical Research Letters. 28(15): 2967-2970. doi:10.1029/2000GL012052. Available at http://zero.eng.ucmerced.edu/rcbales/PARCA/. 24 October 2006. Background: An updated accumulation map for the Greenland Ice Sheet for the period 1971-1990, based on kriging of accurate in situ point estimates developed during the past decade at over 40 points (shallow ice cores) plus over 200 historical points (from snow pits, probes, shallow cores, and coastal precipitation data), shows an average water accumulation of 300 mm snow water equivalent (SWE) per year. Average uncertainty (standard deviation) in estimates of point accumulation for the interior part of the ice sheet, where the kriging drift surface is well constrained, is approximately 70 mm SWE per year, or 24% of mean accumulation. Because there are multiple cores in most regions, the regional uncertainty in accumulation should be considerably lower than the 70 mm SWE per year average uncertainty at a point. There are still many areas on the ice sheet, including northwest and southern Greenland, where annual accumulation remains poorly constrained. Bales, R.C., J.R. McConnell, E. Mosley-Thompson, and G. Lamorey. 2001. Accumulation map for the Greenland Ice Sheet: 1971-1990. Geophysical Research Letters. 28(15): 2967-2970. doi:10.1029/2000GL012052. Available at http://zero.eng.ucmerced.edu/rcbales/PARCA/. 24 October 2006. Background: An updated accumulation map for the Greenland Ice Sheet for the period 1971-1990, based on kriging of accurate in situ point estimates developed during the past decade at over 40 points (shallow ice cores) plus over 200 historical points (from snow pits, probes, shallow cores, and coastal precipitation data), shows an average water accumulation of 300 mm snow water equivalent (SWE) per year. Average uncertainty (standard deviation) in estimates of point accumulation for the interior part of the ice sheet, where the kriging drift surface is well constrained, is approximately 70 mm SWE per year, or 24% of mean accumulation. Because there are multiple cores in most regions, the regional uncertainty in accumulation should be considerably lower than the 70 mm SWE per year average uncertainty at a point. There are still many areas on the ice sheet, including northwest and southern Greenland, where annual accumulation remains poorly constrained. greenland_accumulation Cryosphere Earth Science Greenland Ice Sheets Polar Snow Accumulation Snow Water Equivalent 0 0 573 593 -837081.418 -1130786.327 2031324.049 1838687.117 -179.836596092188 65.1664483438673 179.269613064936 82.4667598139105 urn:ogc:def:crs:EPSG::32661 urn:ogc:def:method:WCS:1.1:2dSimpleGrid -834581.418 1836187.117 5000 -5000 urn:ogc:def:cs:OGC:0.0:Grid2dSquareCS snow water equivalent (SWE) (g cm^-2 yr^-1) pixels nearest neighbor bilinear 1 urn:ogc:def:crs:EPSG::32661 urn:ogc:def:crs:EPSG::4326 urn:ogc:def:crs:EPSG::3408 urn:ogc:def:crs:EPSG::3410 urn:ogc:def:crs:EPSG::3411 urn:ogc:def:crs:EPSG::3413 urn:ogc:def:crs:EPSG::3571 urn:ogc:def:crs:EPSG::3572 urn:ogc:def:crs:EPSG::3573 urn:ogc:def:crs:EPSG::3574 urn:ogc:def:crs:EPSG::3575 urn:ogc:def:crs:EPSG::3576 urn:ogc:def:crs:EPSG::3973 urn:ogc:def:crs:EPSG::3975 urn:ogc:def:crs:EPSG::32624 image/tiff