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dc.contributor.authorPeng, Dongjuen_US
dc.contributor.authorFeng, Lujiaen_US
dc.contributor.authorLarson, Kristine M.en_US
dc.contributor.authorHill, Emma Maryen_US
dc.identifier.citationPeng, D., Feng, L., Larson, K. M. & Hill, E. M. (2021). Measuring coastal absolute sea-level changes using GNSS interferometric reflectometry. Remote Sensing, 13(21), 4319-.
dc.description.abstractRising 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.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relationMOE 2019-T3-1-004en_US
dc.relation.ispartofRemote Sensingen_US
dc.rights© 2021 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).en_US
dc.titleMeasuring coastal absolute sea-level changes using GNSS interferometric reflectometryen_US
dc.typeJournal Articleen
dc.contributor.schoolAsian School of the Environmenten_US
dc.contributor.researchEarth Observatory of Singaporeen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsGlobal Navigation Satellite Systems Interferometric Reflectometry (GNSS-IR)en_US
dc.subject.keywordsSatellite Altimetryen_US
dc.description.acknowledgementThis research was supported by the Singapore Ministry of Education Academic Research Fund Tier 3 (MOE 2019-T3-1-004), and by the National Research Foundation Singapore under its NRF Investigatorship scheme (National Research Investigatorship Award No. NRF-NRFI05-2019-0009), the Earth Observatory of Singapore (EOS), the National Research Foundation of Singapore and the Singapore Ministry of Education under the Research Centers of Excellence initiative.en_US
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