HR: 09:30h
AN: G31A-07    [Abstracts]
TI: The DNSC07A ocean-wide altimetry-derived gravity anomaly field
AU: * Andersen, O B
EM: oa@spacecenter.dk
AF: Danish National Space Center, Juliane Maries Vej 30, Copenhagen, DK-2100, Denmark
AU: Knudsen, P
EM: pk@spacecenter.dk
AF: Danish National Space Center, Juliane Maries Vej 30, Copenhagen, DK-2100, Denmark
AU: Berry, P
EM: pamb@dmu.ac.uk
AF: De Montford University, The Arch, Leiceister, LE1 9BH, United Kingdom
AU: Pavlis, N
EM: Nikolaos.K.Pavlis@nga.mil
AF: National Geospatial-Intelligence Agency, Arnott, St Louis, Mo 20866, United States
AU: Kenyon, S
EM: skenyon@nga.mil
AF: National Geospatial-Intelligence Agency, Arnott, St Louis, Mo 20866, United States
AB: DNSC07A is a new ocean-wide altimetry-derived gravity anomaly field computed at the Danish National Space Center with a spatial resolution of 1 arc-minute by 1 arc-minute covering all marine regions of the world including the Arctic Ocean up to the North Pole. DNSC07A was derived using satellite altimetry from the ERS-1 and GEOSAT geodetic missions, retracked using a highly advanced expert based system of multiple retrackers. This enables accurate ranging to both the open ocean surface and to all ice-covered regions within the +/- 82º of latitude coverage of the ERS satellites. Augmenting these data with ICESat data and with gravity anomalies from the Arctic Gravity Project (ArcGP) enables the continuation of the gravity anomaly field all the way up to the North Pole. The DNSC07A altimetry-derived gravity anomaly field was derived with respect to a very high degree (2160) Earth Gravitational Model designated PGM07B and a consistent mean Dynamic Ocean Topography model designated DOT07A, derived jointly by NGA and its contractor SGT, Inc.. Compared to other pre-existing altimetry-derived gravity anomaly fields like KMS02, DNSC07A is significantly improved, especially over short spatial wavelengths, which can also be seen from comparisons to independent marine gravity data.
UR: http://www.spacecenter.dk
DE: 1200 GEODESY AND GRAVITY
DE: 1219 Gravity anomalies and Earth structure (0920, 7205, 7240)
SC: Geodesy [G]
MN: 2007 Fall Meeting