HR: 0800h
AN: C11A-0086    [Abstracts]
TI: Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal data
AU: * Shen, D
EM: dshen3@ucmerced.edu
AF: University of California, Merced, School of Engineering, Merced, CA 95344,
AU: Bales, R
EM: rbales@ucmerced.edu
AF: University of California, Merced, Sierra Nevada Research Institute & School of Engineering, Merced, CA 95306,
AU: McConnell, J
AF: Desert Research Institute, Division of Hydrologic Sciences, Reno, NV 89512,
AU: Burkhart, J
AF: University of California, Merced, School of Engineering, Merced, CA 95344,
AU: Guo, Q
AF: University of California, Merced, School of Engineering, Merced, CA 95344,
AB: An updated accumulation map was prepared using ice-core and snow-pit data from 250 historical locations on the ice sheet, plus 39 new ice cores strategically placed to fill gaps in the previous accumulation map. In addition data from 26 coastal weather stations were used in the analysis. Daily coastal data were analyzed, gaps filled using interpolation from nearby stations, and wind corrections made. Interpolation was carried out using kriging with semivariogram fitting and cross-validation analysis. A third-order trend was removed from the data with trend analysis. Kriging was performed on the residuals and the trend added back to the kriged residuals to estimate the final accumulation. Results were very sensitive to small changes in corrections to the coastal data. Using only solid precipitation from coastal stations for the interpolation, the average accumulation over Greenland was found to be about 30 g cm-2 yr-1, similar to the average found previously. Using total precipitation from coastal stations in the interpolation gives a Greenland-wide average of about 35 g cm-2 yr-1. There are five areas with differences compared to the previous map, published in 2001. Our current estimate of accumulation is lower in the southwest, northwest and east, but higher in the southeast and northeast.
DE: 0724 Ice cores (4932)
DE: 0726 Ice sheets
DE: 0736 Snow (1827, 1863)
SC: Cryosphere [C]
MN: 2007 Fall Meeting