Global derivation of marine gravity anomalies from Seasat, Geosat, ERS-1 and TOPEX/POSEIDON altimeter data
نویسندگان
چکیده
منابع مشابه
Marine gravity anomaly from Geosat and ERS 1 satellite altimetry
Closely spaced satellite altimeter profiles collected during the Geosat Geodetic Mission (-6 km) and the ERS 1 Geodetic Phase (8 km) are easily converted to grids of vertical gravity gradient and gravity anomaly. The long-wavelength radial orbit error is suppressed below the noise level of the altimeter by taking the along-track derivative of each profile. Ascending and descending slope profile...
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[1] Three approaches are used to reduce the error in the satellite-derived marine gravity anomalies. First, we have retracked the raw waveforms from the ERS-1 and Geosat/GM missions resulting in improvements in range precision of 40% and 27%, respectively. Second, we have used the recently published EGM2008 global gravity model as a reference field to provide a seamless gravity transition from ...
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A comparison of signiicant wave heights H s was performed using satellite altimeter data available between 1978 to 1994 from SEASAT, GEOSAT, ERS-1 and TOPEX. The purpose was to estimate the degree of accuracy between the diierent instruments. Statistical properties of H s as obtained from the altimeters are found to be compatible with those from in situ measurements in the North Atlantic. All H...
متن کاملBathymetric Prediction From SEASAT Altimeter Data
The linear response function technique is used to analyze two 1300-km tracks of SEASAT altimeter data and corresponding bathymetry in the Musician Seamounts region north of Hawaii. Bathymetry and geoid height are highly correlated in the 50to 300-km wavelength range. A predictive filter is developed which can operate on SEASAT altimetry in poorly surveyed oceanic regions to indicate the presenc...
متن کاملRetracking ERS-1 altimeter waveforms for optimal gravity field recovery
S U M M A R Y We have reprocessed ERS-1 radar altimeter waveforms using an algorithm designed to minimize sea surface slope error and decouple it from significant wave height (SWH) error. Standard waveform retracking estimates three parameters—arrival time, SWH and amplitude. We show that errors in retracked estimates of arrival time and SWH are inherently correlated because of the noise charac...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1998
ISSN: 0956-540X
DOI: 10.1111/j.1365-246x.1998.tb07139.x