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


Watson, C and White, N and Church, J and Burgette, R and Tregoning, P and Coleman, R, 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 (2011) [Refereed Article]

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Copyright 2011 Taylor & Francis Group, LLC.

DOI: doi:10.1080/01490419.2011.584834


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 001079). 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 Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Understanding climate change not elsewhere classified
UTAS Author:Watson, C (Dr Christopher Watson)
UTAS Author:Burgette, R (Dr Reed Burgette)
UTAS Author:Coleman, R (Professor Richard Coleman)
ID Code:74960
Year Published:2011
Web of Science® Times Cited:52
Deposited By:Geography and Environmental Studies
Deposited On:2011-12-20
Last Modified:2012-06-19
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