Resolving marine gravity with ERS-1 satellite altimetry

Details Resolving marine gravity with ERS-1 satellite altimetry Resolving marine gravity with ERS-1 satellite altimetry

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2271m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 22, p. 2271-2274.

Physics

8

Earth Gravitation, Ers-1 (Esa Satellite), Gravimetry, Oceanography, Satellite Altimetry, Geoids, Gravitational Fields, Gravity Anomalies

Scientific paper

To estimate how well ERS-1 data from the 35-day repeat mission can resolve fine structure in the marine geoid or gravity field, we compare along-track gravity and gridded gravity fields derived from ERS-1 fast delivery altimeter data to those computed from Geosat Geodetic Mission altimeter observations in the Southern Ocean. We find that single passes of ERS-1 data can resolve along-track gravity anomalies with wavelengths as short as 28-30 km (i.e., comparable to Geosat). However, the ERS-1 gridded gravity field can only resolve anomalies as short as 66 km (versus 19 km for Geosat). This 2D resolution is limited by the larger ground track spacing. To resolve fine structure in the marine gravity field it is essential to have altimeter data along more closely-spaced ground tracks, such as those planned for the ERS-1 176-day repeat mission in 1994.

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