Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry

Rising sea levels pose one of the greatest threats to coastal zones. However, sea-level changes near the coast, particularly absolute sea-level changes, have been less well monitored than those in the open ocean. In this study, we aim to investigate the potential of Global Navigation Satellite Syste...

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Autores principales:	Dongju Peng, Lujia Feng, Kristine M. Larson, Emma M. Hill
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	GNSS-IR satellite altimetry coastal sea-level changes Science Q
Acceso en línea:	https://doaj.org/article/0e5387ceef15422eab6c7d2a47a13719
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spelling	oai:doaj.org-article:0e5387ceef15422eab6c7d2a47a137192021-11-11T18:53:49ZMeasuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry10.3390/rs132143192072-4292https://doaj.org/article/0e5387ceef15422eab6c7d2a47a137192021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4319https://doaj.org/toc/2072-4292Rising sea levels pose one of the greatest threats to coastal zones. However, sea-level changes near the coast, particularly absolute sea-level changes, have been less well monitored than those in the open ocean. In this study, we aim to investigate the potential of Global Navigation Satellite Systems Interferometric Reflectometry (GNSS-IR) to measure coastal absolute sea-level changes and tie on-land (coastal GNSS) and offshore (satellite altimetry) observations into the same framework. We choose three coastal GNSS stations, one each in regions of subsidence, uplift and stable vertical land motions, to derive both relative sea levels and sea surface heights (SSH) above the satellite altimetry reference ellipsoid from 2008 to 2020. Our results show that the accuracy of daily mean sea levels from GNSS-IR is <1.5 cm compared with co-located tide-gauge records, and amplitudes of annual cycle and linear trends estimated from GNSS-IR measurements and tide-gauge data agree within uncertainty. We also find that the de-seasoned and de-trended SSH time series from GNSS-IR and collocated satellite altimetry are highly correlated and the estimated annual amplitudes and linear trends statistically agree well, indicating that GNSS-IR has the potential to monitor coastal absolute sea-level changes and provide valuable information for coastal sea-level and climate studies.Dongju PengLujia FengKristine M. LarsonEmma M. HillMDPI AGarticleGNSS-IRsatellite altimetrycoastal sea-level changesScienceQENRemote Sensing, Vol 13, Iss 4319, p 4319 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	GNSS-IR satellite altimetry coastal sea-level changes Science Q
spellingShingle	GNSS-IR satellite altimetry coastal sea-level changes Science Q Dongju Peng Lujia Feng Kristine M. Larson Emma M. Hill Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry
description	Rising sea levels pose one of the greatest threats to coastal zones. However, sea-level changes near the coast, particularly absolute sea-level changes, have been less well monitored than those in the open ocean. In this study, we aim to investigate the potential of Global Navigation Satellite Systems Interferometric Reflectometry (GNSS-IR) to measure coastal absolute sea-level changes and tie on-land (coastal GNSS) and offshore (satellite altimetry) observations into the same framework. We choose three coastal GNSS stations, one each in regions of subsidence, uplift and stable vertical land motions, to derive both relative sea levels and sea surface heights (SSH) above the satellite altimetry reference ellipsoid from 2008 to 2020. Our results show that the accuracy of daily mean sea levels from GNSS-IR is <1.5 cm compared with co-located tide-gauge records, and amplitudes of annual cycle and linear trends estimated from GNSS-IR measurements and tide-gauge data agree within uncertainty. We also find that the de-seasoned and de-trended SSH time series from GNSS-IR and collocated satellite altimetry are highly correlated and the estimated annual amplitudes and linear trends statistically agree well, indicating that GNSS-IR has the potential to monitor coastal absolute sea-level changes and provide valuable information for coastal sea-level and climate studies.
format	article
author	Dongju Peng Lujia Feng Kristine M. Larson Emma M. Hill
author_facet	Dongju Peng Lujia Feng Kristine M. Larson Emma M. Hill
author_sort	Dongju Peng
title	Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry
title_short	Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry
title_full	Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry
title_fullStr	Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry
title_full_unstemmed	Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry
title_sort	measuring coastal absolute sea-level changes using gnss interferometric reflectometry
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0e5387ceef15422eab6c7d2a47a13719
work_keys_str_mv	AT dongjupeng measuringcoastalabsolutesealevelchangesusinggnssinterferometricreflectometry AT lujiafeng measuringcoastalabsolutesealevelchangesusinggnssinterferometricreflectometry AT kristinemlarson measuringcoastalabsolutesealevelchangesusinggnssinterferometricreflectometry AT emmamhill measuringcoastalabsolutesealevelchangesusinggnssinterferometricreflectometry
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Measuring Coastal Absolute Sea-Level Changes Using GNSS Interferometric Reflectometry

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