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Absolute Calibration of TOPEX/Poseidon and Jason-1 Using UK Tide Gauges, GPS and a Local Precise Geoid Model

Lookup NU author(s): Professor Philip Moore


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This presentation will describe the use of UK tide gauges, the sea level data from which can be located using GPS in the same geocentric reference framr as altimeter data from TOPEX, to provide an ongoing absolute calibration of the altimeter bias. The method is an extension of that of Murphy et al. (JGR, 101(C6), 14191-14200). However, in this analysis, not a priori tide or surge model corrections have been required between gauge and altimeter measurement points, the tide-gauge corrections being derivable from the data themselves. In addition, the analysis has benefited from the continuing improvements in precise local geoid models (e.g. EGG97) with which one can compute the nexessary gauge-altimeter sea surface height differences. The research complements that in Australia (Coleman et al., this conference) and elsewhere and can, in principle, be applied at any other location for which a precise local geoid model is available. The relatively sparser Poseidon data set has been used as a test of out ability to perform an absolute calibration of upcoming Jason-1 altimetry as soon as possible after launch.

Publication metadata

Author(s): Moore P, Dong X, Woodworth P, Bingley R

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Abstracts of presentations at workshops during the 7th session of the IOC Group of Experts on the Global Sea Level Observing System

Year of Conference: 2003

Pages: 6

Publisher: USA:UNESCO