Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis
The new dynamic atmospheric correction (DAC) and dry tropospheric (DT) correction derived from the ERA-Interim meteorological reanalysis have been computed for the 1992–2013 altimeter period. Using these new corrections significantly improves sea level estimations for short temporal signals (< 2...
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ftdoajarticles:oai:doaj.org/article:72c1775e02554c209f9badcd43c762f1 2023-05-15T18:25:45+02:00 Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis L. Carrere Y. Faugère M. Ablain 2016-06-01T00:00:00Z https://doi.org/10.5194/os-12-825-2016 https://doaj.org/article/72c1775e02554c209f9badcd43c762f1 EN eng Copernicus Publications http://www.ocean-sci.net/12/825/2016/os-12-825-2016.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-12-825-2016 https://doaj.org/article/72c1775e02554c209f9badcd43c762f1 Ocean Science, Vol 12, Iss 3, Pp 825-842 (2016) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2016 ftdoajarticles https://doi.org/10.5194/os-12-825-2016 2022-12-31T03:36:42Z The new dynamic atmospheric correction (DAC) and dry tropospheric (DT) correction derived from the ERA-Interim meteorological reanalysis have been computed for the 1992–2013 altimeter period. Using these new corrections significantly improves sea level estimations for short temporal signals (< 2 months); the impact is stronger if considering old altimeter missions (ERS-1, ERS-2, and Topex/Poseidon), for which DAC_ERA (DAC derived from ERA-Interim meteorological reanalysis) allows reduction of the along-track altimeter sea surface height (SSH) error by more than 3 cm in the Southern Ocean and in some shallow water regions. The impact of DT_ERA (DT derived from ERA-Interim meteorological reanalysis) is also significant in the southern high latitudes for these missions. Concerning more recent missions (Jason-1, Jason-2, and Envisat), results are very similar between ERA-Interim and ECMWF-based corrections: on average for the global ocean, the operational DAC becomes slightly better than DAC_ERA only from the year 2006, likely due to the switch of the operational forcing to a higher spatial resolution. At regional scale, both DACs are similar in the deep ocean but DAC_ERA raises the residual crossovers' variance in some shallow water regions, indicating a slight degradation in the most recent years of the study. In the second decade of altimetry, unexpectedly DT_ERA still gives better results compared to the operational DT. Concerning climate signals, both DAC_ERA and DT_ERA have a low impact on global mean sea level rise (MSL) trends, but they can have a strong impact on long-term regional trends' estimation, up to several millimeters per year locally. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Ocean Science 12 3 825 842 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 L. Carrere Y. Faugère M. Ablain Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
The new dynamic atmospheric correction (DAC) and dry tropospheric (DT) correction derived from the ERA-Interim meteorological reanalysis have been computed for the 1992–2013 altimeter period. Using these new corrections significantly improves sea level estimations for short temporal signals (< 2 months); the impact is stronger if considering old altimeter missions (ERS-1, ERS-2, and Topex/Poseidon), for which DAC_ERA (DAC derived from ERA-Interim meteorological reanalysis) allows reduction of the along-track altimeter sea surface height (SSH) error by more than 3 cm in the Southern Ocean and in some shallow water regions. The impact of DT_ERA (DT derived from ERA-Interim meteorological reanalysis) is also significant in the southern high latitudes for these missions. Concerning more recent missions (Jason-1, Jason-2, and Envisat), results are very similar between ERA-Interim and ECMWF-based corrections: on average for the global ocean, the operational DAC becomes slightly better than DAC_ERA only from the year 2006, likely due to the switch of the operational forcing to a higher spatial resolution. At regional scale, both DACs are similar in the deep ocean but DAC_ERA raises the residual crossovers' variance in some shallow water regions, indicating a slight degradation in the most recent years of the study. In the second decade of altimetry, unexpectedly DT_ERA still gives better results compared to the operational DT. Concerning climate signals, both DAC_ERA and DT_ERA have a low impact on global mean sea level rise (MSL) trends, but they can have a strong impact on long-term regional trends' estimation, up to several millimeters per year locally. |
format |
Article in Journal/Newspaper |
author |
L. Carrere Y. Faugère M. Ablain |
author_facet |
L. Carrere Y. Faugère M. Ablain |
author_sort |
L. Carrere |
title |
Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis |
title_short |
Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis |
title_full |
Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis |
title_fullStr |
Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis |
title_full_unstemmed |
Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis |
title_sort |
major improvement of altimetry sea level estimations using pressure-derived corrections based on era-interim atmospheric reanalysis |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/os-12-825-2016 https://doaj.org/article/72c1775e02554c209f9badcd43c762f1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Ocean Science, Vol 12, Iss 3, Pp 825-842 (2016) |
op_relation |
http://www.ocean-sci.net/12/825/2016/os-12-825-2016.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-12-825-2016 https://doaj.org/article/72c1775e02554c209f9badcd43c762f1 |
op_doi |
https://doi.org/10.5194/os-12-825-2016 |
container_title |
Ocean Science |
container_volume |
12 |
container_issue |
3 |
container_start_page |
825 |
op_container_end_page |
842 |
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1766207394014035968 |