HR: 1340h
AN: OS43A-0991    [Abstracts]
TI: New Arctic Gravity Field Grids with Applications for Oceanography and Bathymetry
AU: * Forsberg, R
EM: rf@space.dtu.dk
AF: Danish National Space Ceter, Juliane Maries Vej 30, Copenhagen, 2200, Denmark
AU: Skourup, H
EM: hsk@space.dtu.dk
AF: Danish National Space Ceter, Juliane Maries Vej 30, Copenhagen, 2200, Denmark
AU: Kenyon, S C
EM: steve.c.kenyon@nga.mil
AF: National Geospatial Inteligence Agency, 3838 Vogel Rd., St. Louis, Mo. 63010, United States
AU: Laxon, S W
EM: swl@cpom.ucl.ac.uk
AF: Centre for Polar Observation and Modelling, University College London Gower Street, London, WC1E 6BT, United Kingdom
AU: Jakobsson, M
EM: Martin.jakobsson@geo.su.se
AF: University of Stockholm, Svente Arrhenius Vag 8c, Stockholm, 10691, Sweden
AB: New Arctic Gravity Project 5' grids have been compiled, incorporating significant new data sources in addition to the extensive holdings of airborne, surface, submarine and satellite gravimetry which went into the earlier releases of the ArcGP grids. The new data sources include Russian surface gravimetry over the over the entire Siberian shelf and adjacent ocean regions, provided by VNIIO, as well as new cruise data from submarines and surface vessels, such as the 2007 LOMROG cruise to the Lomonossov Ridge. New high-resolution satellite gravity data, derived from ICESat laser altimetry, has also been incorporated in regions of poor surface data quality. A corresponding precise geoid model of the Arctic has additionally been derived based on GRACE satellite data. The geoid model, combined with ocean sea surface heights derived from ICESat and ERS, may provide independent estimates of ocean mean dynamic topography (MDT), and thus provide independent means for deriving overall Arctic Ocean circulation. We compare MDT from a number of oceanographic models to the satellite/ArcGP estimates, illustrating the large differences between a number of current Arctic Ocean oceanographic models. These comparisons are done as part of a recently completed ESA study - ArcGICE - aimed at quantifying errors in geoid, MDT and tides in support of Arctic sea-ice thickness mapping. Applications of the ArcGP data also include the estimation of bathymetry in regions of poor bathymetric data coverage. We show examples from the Morris Jesup Rise/Lomossov Ridge areas, where inversion of ArcGP gravity and new LOMROG gravimetry is used together with existing bathymetry track data for detecting errors in the IBCAO bathymetry.
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1640 Remote sensing (1855)
DE: 4556 Sea level: variations and mean (1222, 1225, 1641)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting