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Oceanwide gravity anomalies from Geos-3, Seasat and Geosat altimeter dataThree kinds of satellite altimeter data have been combined, along with 5 x 5 arcmin bathymetric data, to calculate a 0.125 deg ocean wide gridded set of 2.3 x 10 exp 6 free-air gravity anomalies. The procedure used was least squares collocation that yields the predicted anomaly and standard deviation. The value of including the bathymetric data was shown in a test around the Dowd Seamount where the root mean square (rms) difference between ship gravity measurements decreased from +/- 40 mgal to +/- 20 mgal when the bathymetry was included. Comparisons between the predicted anomalies and ship gravity data is described in three cases. In the Banda Sea the rms differences were +/- 20 mgal for two lines. In the South Atlantic rms differences over lines of 2000 km in length were +/- 7 mgal. For cruise data in the Antarctica region the discrepancies were +/- 12 mgal. Comparisons of anomalies derived from the Geosat geodetic mission data by Marks and McAdoo (1992) with ship dta gave differences of +/- 6 mgal showing the value of the much denser Geosat geodetic mission altimeter data.
Document ID
19930026399
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rapp, Richard H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Basic, Tomislav
(Ohio State Univ. Columbus, United States)
Date Acquired
August 15, 2013
Publication Date
October 2, 1992
Publication Information
Publication: Geophysical Research Letters
Volume: 19
Issue: 19
ISSN: 0094-8276
Subject Category
Oceanography
Accession Number
93A10396
Funding Number(s)
CONTRACT_GRANT: JPL-958121
CONTRACT_GRANT: NAG5-781
Distribution Limits
Public
Copyright
Other

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