HR: 14:55h
AN: G23A-06    [Abstracts]
TI: Geoid, mean sea level and ice thickness in the Arctic Ocean from GRACE and ICESAT
AU: * Forsberg, R
EM: rf@dnsc.dk
AF: Danish National Space Center, Juliane Maries Vej 30, Copenhagen Oe, DK2100 Denmark
AU: Skourup, H
EM: hsk@dnsc.dk
AF: Danish National Space Center, Juliane Maries Vej 30, Copenhagen Oe, DK2100 Denmark
AU: Tscherning, C C
EM: cct@gfy.ku.dk
AF: Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen Oe, DK2100 Denmark
AB: The geoid as determined from space, airborne and surface gravity data, is an important fundamental surface for the determination of mean sea level and sea ice freeboard heights (and thus ice thickness) from satellite and airborne laser measurements. With recent GRACE models such as GGM02S we are now at the stage where absolute levels of such geoid models are determined with cm accuracy. In the paper we outline the determination of an improved Arctic geoid model and associated error covariance estimates, based on an recent updated surface, submarine and airborne data of the Arctic Gravity Project, as well as recent GRACE models. We then use ICESat laser altimetry data to derive updated ice thickness and mean sea surface heights for the central Arctic Ocean. The combination of geoid and satellite sea level data forms the core of the ARCGICE project, a cooperation between several European and Canadian partners, aimed at characterizing errors in the Arctic Ocean mean sea surface, as needed for satellite sea ice thickness mapping by CryoSat, as well as investigating the agreements between satellite-derived and oceanographic mean dynamic topography models.
DE: 1214 Geopotential theory and determination (0903)
DE: 1222 Ocean monitoring with geodetic techniques (1225, 1641, 3010, 4532, 4556, 4560, 6959)
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
SC: Geodesy [G]
MN: Fall Meeting 2005