HR: 14:25h
AN: G33C-04    [Abstracts]
TI: Recent ice sheet and glacier elevation changes in Greenland from aircraft laser altimetry
AU: * Krabill, W B
EM: william.b.krabill@nasa.gov
AF: NASA/GSFC/Wallops Flight Facility, Building N159, Room E201, Wallops Island, VA 23337, United States
AU: Thomas, R H
EM: robert_thomas@hotmail.com
AF: EG&G Services, Inc., NASA Wallops Flight Facility Building N159, Wallops Island, VA 23337, United States
AU: Sonntag, J G
EM: sonntag@osb.wff.nasa.gov
AF: EG&G Services, Inc., NASA Wallops Flight Facility Building N159, Wallops Island, VA 23337, United States
AU: Manizade, S S
EM: Serdar.S.Manizade@nasa.gov
AF: EG&G Services, Inc., NASA Wallops Flight Facility Building N159, Wallops Island, VA 23337, United States
AB: The Arctic Ice Mapping group (Project AIM) at the NASA Goddard Space Flight Center Wallops Flight Facility has been conducting systematic topographic surveys of the Greenland Ice Sheet (GIS) since 1993, using scanning airborne laser altimeters combined with Global Positioning System (GPS) technology. Earlier surveys showed the ice sheet above 2000-m elevation to be in balance, but with localized regions of thickening or thinning. Thinning predominates at lower elevations and thinning rates have recently increased, resulting in a negative mass balance for the entire ice sheet. In May 2007 critical segments of near-coastal flight lines in Greenland were re-surveyed. Results from the new data will be presented.
DE: 0720 Glaciers
DE: 0726 Ice sheets
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
SC: Geodesy [G]
MN: 2007 Fall Meeting