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Oceanwide gravity anomalies from GEOS‐3, Seasat and Geosat altimeter data
Author(s) -
Rapp Richard H.,
Bašić Tomislav
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl02247
Subject(s) - bathymetry , altimeter , geodesy , geology , geodetic datum , geoid , gravity anomaly , collocation (remote sensing) , standard deviation , free air gravity anomaly , gravimetry , data set , seamount , bouguer anomaly , remote sensing , geophysics , oceanography , mathematics , paleontology , statistics , geotechnical engineering , oil field , reservoir modeling , measured depth
Three kinds of satellite altimeter data have been combined, along with 5'×5' bathymetric data, to calculate a 0°.125 ocean wide gridded set of 2.3×10 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 data gave differences of ±6 mgal showing the value of the much denser Geosat geodetic mission altimeter data.