气候变化领域集成服务门户(CCPortal): Estimating Vertical Land Motion and Residual Altimeter Systematic Errors Using a Kalman-Based Approach

CCPortal

DOI	10.1029/2020JC017106
	Estimating Vertical Land Motion and Residual Altimeter Systematic Errors Using a Kalman-Based Approach
	Rezvani M.-H.; Watson C.S.; King M.A.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	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 ∼±0.5–2.5 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. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	altimetry systematic errors; global climate change; GPS velocity field; sea-level rise; spatially interpolated GPS velocities \| glacial isostatic adjustment \| Baltic Sea; vertical land motion
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186265
作者单位	School of Geography, Planning, and Spatial Sciences, University of Tasmania, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Rezvani M.-H.,Watson C.S.,King M.A.. Estimating Vertical Land Motion and Residual Altimeter Systematic Errors Using a Kalman-Based Approach[J],2021,126(6).
APA	Rezvani M.-H.,Watson C.S.,&King M.A..(2021).Estimating Vertical Land Motion and Residual Altimeter Systematic Errors Using a Kalman-Based Approach.Journal of Geophysical Research: Oceans,126(6).
MLA	Rezvani M.-H.,et al."Estimating Vertical Land Motion and Residual Altimeter Systematic Errors Using a Kalman-Based Approach".Journal of Geophysical Research: Oceans 126.6(2021).