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Vertical deformation and residual altimeter systematic errors around continental Australia inferred from a Kalman-based approach

Citation

Rezvani, MH and Watson, CS and King, MA, Vertical deformation and residual altimeter systematic errors around continental Australia inferred from a Kalman-based approach, Journal of Geodesy, 96, (12) pp. 1-21. ISSN 1432-1394 (2022) [Refereed Article]


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DOI: doi:10.1007/s00190-022-01680-3

Abstract

We further developed a space–time Kalman approach to investigate time-fixed and time-variable signals in vertical land motion (VLM) and residual altimeter systematic errors around the Australian coast, through combining multi-mission absolute sea-level (ASL), relative sea-level from tide gauges (TGs) and Global Positioning System (GPS) height time series. Our results confirmed coastal subsidence in broad agreement with GPS velocities and unexplained by glacial isostatic adjustment alone. VLM determined at individual TGs differs from spatially interpolated GPS velocities by up to ~ 1.5 mm/year, yielding a ~ 40% reduction in RMSE of geographic ASL variability at TGs around Australia. Our mission-specific altimeter error estimates are small but significant (typically within ~ ± 0.5–1.0 mm/year), with negligible effect on the average ASL rate. Our circum-Australia ASL rate is higher than previous results, suggesting an acceleration in the ~ 27-year time series. Analysis of the time-variability of altimeter errors confirmed stability for most missions except for Jason-2 with an anomaly reaching ~ 2.8 mm/year in the first ~ 3.5 years of operation, supported by analysis from the Bass Strait altimeter validation facility. Data predominantly from the reference missions and located well off narrow shelf regions was shown to bias results by as much as ~ 0.5 mm/year and highlights that residual oceanographic signals remain a fundamental limitation. Incorporating non-reference-mission measurements well on the shelf helped to mitigate this effect. Comparing stacked nonlinear VLM estimates and altimeter systematic errors with the El Niño-Southern Oscillation shows weak correlation and suggests our approach improves the ability to explore nonlinear localized signals and is suitable for other regional- and global-scale studies.

Item Details

Item Type:Refereed Article
Keywords:Vertical land motion, Altimeter systematic errors, Sea-level rise,
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Rezvani, MH (Mr Mohammad-Hadi Rezvani)
UTAS Author:Watson, CS (Dr Christopher Watson)
UTAS Author:King, MA (Professor Matt King)
ID Code:154497
Year Published:2022
Funding Support:Australian Research Council (DP150100615)
Deposited By:Geography and Spatial Science
Deposited On:2022-12-06
Last Modified:2022-12-11
Downloads:0

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