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Absolute Calibration in Bass Strait, Australia: TOPEX, Jason-1 and OSTM/Jason-2

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Watson, CS and White, NC and Church, JA and Burgette, RJ and Tregoning, P and Coleman, R (2012) Absolute Calibration in Bass Strait, Australia: TOPEX, Jason-1 and OSTM/Jason-2. Marine Geodesy: An International Journal of Ocean Surveys, Mapping and Sensing, 34 (3-4). pp. 242-260. ISSN 0149-0419 print

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Abstract

Updated absolute bias estimates are presented from the Bass Strait calibration site (Australia) for the TOPEX/Poseidon (T/P), Jason-1 and the Ocean Surface Topography Mission (OSTM/Jason-2) altimeter missions. Results from the TOPEX side A and side B data show biases insignificantly different from zero when assessed against our error budget (−15 ± 20 mm, and −6 ± 18 mm, respectively). Jason-1 shows a considerably higher absolute bias of +93 ± 15 mm, indicating that the observed sea surface is higher (or the range shorter), than truth. For OSTM/Jason-2, the absolute bias is further increased to +172 ± 18 mm (determined from T/GDR data, cycles 001–079). Enhancements made to the Jason-1 and OSTM/Jason-2 microwave radiometer derived products for correcting path delays induced by the wet troposphere are shown to benefit the bias estimate at the Bass Strait site through the reduction of land contamination. We note small shifts to bias estimates when using the enhanced products, changing the biases by+11 and+3 mm for Jason-1 and OSTM/Jason-2, respectively. The significant, and as yet poorly understood, absolute biases observed for both Jason series altimeters reinforces the continued need for further investigation of the measurement systems and ongoing monitoring via in situ calibration sites.

Item Type: Article
Journal or Publication Title: Marine Geodesy: An International Journal of Ocean Surveys, Mapping and Sensing
Page Range: pp. 242-260
ISSN: 0149-0419 print
Identification Number - DOI: 10.1080/01490419.2011.584834
Additional Information: Copyright © Taylor & Francis Group
Date Deposited: 17 May 2012 02:51
Last Modified: 18 Nov 2014 04:32
URI: http://eprints.utas.edu.au/id/eprint/13324
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