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Estimating vertical land motion and residual altimeter systematic errors using a Kalman-based approach


Rezvani, M-H and Watson, CS and King, MA, Estimating vertical land motion and residual altimeter systematic errors using a Kalman-based approach, Journal of Geophysical Research: Oceans, 126, (6) Article e2020JC017106. ISSN 2169-9275 (2021) [Refereed Article]

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2021. American Geophysical Union. All Rights Reserved.

DOI: doi:10.1029/2020JC017106


Vertical land motion (VLM) is the connection between absolute sea-level (ASL) from a satellite altimeter (ALT) and relative sea-level from a tide gauge (TG). VLM is often sparsely observed yet is required for understanding sea-level rise. Many studies have sought to exploit ALT and TG data to infer VLM, yet regionally correlated systematic errors in altimetry have not been considered. We have developed a Kalman filtering and smoothing framework to simultaneously estimate location-specific VLM and residual mission-specific systematic errors in a geocentric reference frame. We used ALT minus TG, ALT crossovers and global positioning system (GPS) bedrock height observations in a multi-stage solution approach that gradually separated time-variable parameter estimates in an ill-posed problem. We evaluated the performance of the method using the Jason-series along-track data in the Baltic Sea, where glacial isostatic adjustment is the dominant driver of VLM. We estimated local VLM variability at TGs of up to ∼4.5 mm/yr which is not evident in spatially interpolated GPS velocities. The estimated regional altimeter errors are significant and within the range of ∼0.52.5 mm/yr. Our approach improves agreement between ASL estimates from ALT and TG records, provides a ∼20% decrease in root mean squared error of latitudinal ASL variability at TGs, and a reduction of the ASL rate from altimetry by ∼0.3 mm/yr across the region. This method advances the ALT-TG approach to determining VLM at TG locations and systematic errors of altimetry, which is broadly applicable to other regional- and global-scale studies.

Item Details

Item Type:Refereed Article
Keywords:vertical land motion, altimetry systematic errors, sea-level rise, global climate change, GPS velocity field, spatially interpolated GPS velocities, glacial isostatic adjustment, Baltic Sea
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, M-H (Mr Mohammad-Hadi Rezvani)
UTAS Author:Watson, CS (Dr Christopher Watson)
UTAS Author:King, MA (Professor Matt King)
ID Code:145150
Year Published:2021
Web of Science® Times Cited:3
Deposited By:Geography and Spatial Science
Deposited On:2021-07-02
Last Modified:2022-08-24
Downloads:15 View Download Statistics

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