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Ocean tide loading effects on InSAR observations over wide regions

Lookup NU author(s): Chen Yu, Dr Nigel Penna, Professor Zhenhong Li

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Recent and future Interferometric Synthetic Aperture Radar (InSAR) missions providespatially wide and temporally continuous observations capturing relative ground motions over greatdistances which enable nationwide or continent‐wide deformation mapping. To achieve this, longwavelength errors, which increase with distance and are coupled with geophysical deformation, must becorrected. We predict the ocean tide loading (OTL) effect on Sentinel‐1 interferograms globally for allascending and descending acquisitions, and they are largest in coastal regions. Then, interferograms oversouthwest Britain are investigated, with the OTL correction having a similar noise reduction effect as whencorrecting for tropospheric delay (27% standard deviation reduction for tropospheric delay and 46% forcombined tropospheric delay and OTL). OTL corrections contribute considerably to the noise reduction ofthe InSAR time series, with the time series standard deviation reducing by 33% after correcting troposphericerrors and 52% after also applying OTL corrections.


Publication metadata

Author(s): Yu C, Penna NT, Li Z

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2020

Volume: 47

Issue: 15

Print publication date: 16/08/2020

Online publication date: 17/07/2020

Acceptance date: 02/07/2020

Date deposited: 03/08/2020

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: Wiley-Blackwell Publishing, Inc.

URL: https://doi.org/10.1029/2020GL088184

DOI: 10.1029/2020GL088184


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