HR: 0800h
AN: C51A-0103    [Abstracts]
TI: New present day temperature parameterization and Degree Day model for Greenland
AU: * Fausto, R S
EM: rfo@gfy.ku.dk
AF: University of Copenhagen, Juliane Maries Vej 26-32, Copenhagen, 2100, Denmark
AU: * Fausto, R S
EM: rfo@gfy.ku.dk
AF: Geological Survey of Denmark and Greenland, Oester voldgade 10, Copenhagen, 1350, Denmark
AU: Ahlstrom, A P
EM: apa@geus.dk
AF: Geological Survey of Denmark and Greenland, Oester voldgade 10, Copenhagen, 1350, Denmark
AU: Boggild, C E
EM: carl.egede.boggild@unis.no
AF: University centre in Svalbard, PB 156, Longyearbyen, 9171, Norway
AU: Johnsen, S J
EM: sigfus@gfy.ku.dk
AF: University of Copenhagen, Juliane Maries Vej 26-32, Copenhagen, 2100, Denmark
AB: Surface temperature, melt rate and melt area for the Greenland Ice Sheet is parameterized using data from American and Danish Automatic Weather Stations (AWS) located near and on the ice sheet. The surface temperature is parameterized in terms of mean annual temperature, mean July temperature and mean annual precipitation. Melt rate is calculated using a positive degree day model, that accounts for firn warming, rainfall, refreezing of melt water and different degree day factors for ice and snow under warm and cold conditions. The temperature parameterization and degree day model has a high integration performance in numerical schemes and it is optimized for the use in large scale ice sheet models with spatial resolution of roughly 10-20 km. The positive degree-day factors for melt and refreezing of melt are adjusted in order to have the modeled melt area to fit as closely as possible with the observed values based on satellite algorithms. Methods and results are presented together with a discussion of the performance of these simple observation based models versus more sophisticated models.
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1863 Snow and ice (0736, 0738, 0776, 1827)
DE: 4540 Ice mechanics and air/sea/ice exchange processes (0700, 0750, 0752, 0754)
SC: Cryosphere [C]
MN: 2007 Fall Meeting