Open AccessDetailed 1×1° gravimetric Indian Ocean geoid and comparison with GEOS‐3 radar altimeter geoid profiles
Author(s) -
Kahle HansGert,
Chapman Michael,
Talwani Manik
Publication year - 1978
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1978.tb05938.x
Subject(s) - geoid , altimeter , geodesy , geology , radar altimeter , undulation of the geoid , ocean surface topography , radar , remote sensing , gravimetry , geophysics , measured depth , telecommunications , geotechnical engineering , computer science , reservoir modeling
Summary. A new set of 1×1° mean free‐air anomalies in the Indian Ocean is determined on the basis of previously published free‐air anomaly maps (Talwani & Kahle) and the most recent Lamont surface ship gravity measurements. The data are then used to compute a (total) 1×1° gravimetric Indian Ocean geoid. The computation is carried out by combining the Goddard Space Flight Center (GSFC) GEM‐6 geoid and a difference geoid that corresponds to the differences between the set of 1×1° surface gravity values and the GEM‐6 gravity anomalies. The difference geoid is highest over the Madagascar Ridge (+ 20 m) and lowest over the Timor Trough (‐30 m). The total geoid is compared with GEOS‐3 radar altimeter derived geoid profiles and geophysical implications are discussed.