Improved global sea surface height and current maps from remote sensing and in situ observations
We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale and multivariate mapping approach that offers the possibility to improve the physical content of gridded products by comb...
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00064512 2023-05-15T15:02:03+02:00 Improved global sea surface height and current maps from remote sensing and in situ observations Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas 2023-01 electronic https://doi.org/10.5194/essd-15-295-2023 https://noa.gwlb.de/receive/cop_mods_00064512 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063278/essd-15-295-2023.pdf https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf eng eng Copernicus Publications Earth System Science Data -- http://www.earth-syst-sci-data.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2475469 -- 1866-3516 https://doi.org/10.5194/essd-15-295-2023 https://noa.gwlb.de/receive/cop_mods_00064512 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063278/essd-15-295-2023.pdf https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/essd-15-295-2023 2023-01-23T00:13:29Z We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale and multivariate mapping approach that offers the possibility to improve the physical content of gridded products by combining the data from various platforms and resolving a broader spectrum of ocean surface dynamic than in the current operational mapping system. The dataset covers the entire global ocean and spans from 1 July 2016 to 30 June 2020. The multiscale approach decomposes the observed signal into different physical contributions. In the present study, we simultaneously estimate the mesoscale ocean circulations as well as part of the equatorial wave dynamics (e.g. tropical instability and Poincaré waves). The multivariate approach is able to exploit the geostrophic signature resulting from the synergy of altimetry and drifter observations. Sea-level observations in Arctic leads are also used in the merging to improve the surface circulation in this poorly mapped region. A quality assessment of this new product is proposed with regard to an operational product distributed in the Copernicus Marine Service. We show that the multiscale and multivariate mapping approach offers promising perspectives for reconstructing the ocean surface circulation: observations of leads contribute to improvement of the coverage in delivering gap-free maps in the Arctic and observations of drifters help to refine the mapping in regions of intense dynamics where the temporal sampling must be accurate enough to properly map the rapid mesoscale dynamics. Overall, the geostrophic circulation is better mapped in the new product, with mapping errors significantly reduced in regions of high variability and in the equatorial band. The resolved scales of this new product are therefore between 5 % and 10 % finer than the Copernicus product (https://doi.org/10.48670/moi-00148, Pujol et al., 2022b). Article in Journal/Newspaper Arctic Niedersächsisches Online-Archiv NOA Arctic Earth System Science Data 15 1 295 315 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas Improved global sea surface height and current maps from remote sensing and in situ observations |
topic_facet |
article Verlagsveröffentlichung |
description |
We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale and multivariate mapping approach that offers the possibility to improve the physical content of gridded products by combining the data from various platforms and resolving a broader spectrum of ocean surface dynamic than in the current operational mapping system. The dataset covers the entire global ocean and spans from 1 July 2016 to 30 June 2020. The multiscale approach decomposes the observed signal into different physical contributions. In the present study, we simultaneously estimate the mesoscale ocean circulations as well as part of the equatorial wave dynamics (e.g. tropical instability and Poincaré waves). The multivariate approach is able to exploit the geostrophic signature resulting from the synergy of altimetry and drifter observations. Sea-level observations in Arctic leads are also used in the merging to improve the surface circulation in this poorly mapped region. A quality assessment of this new product is proposed with regard to an operational product distributed in the Copernicus Marine Service. We show that the multiscale and multivariate mapping approach offers promising perspectives for reconstructing the ocean surface circulation: observations of leads contribute to improvement of the coverage in delivering gap-free maps in the Arctic and observations of drifters help to refine the mapping in regions of intense dynamics where the temporal sampling must be accurate enough to properly map the rapid mesoscale dynamics. Overall, the geostrophic circulation is better mapped in the new product, with mapping errors significantly reduced in regions of high variability and in the equatorial band. The resolved scales of this new product are therefore between 5 % and 10 % finer than the Copernicus product (https://doi.org/10.48670/moi-00148, Pujol et al., 2022b). |
format |
Article in Journal/Newspaper |
author |
Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas |
author_facet |
Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas |
author_sort |
Ballarotta, Maxime |
title |
Improved global sea surface height and current maps from remote sensing and in situ observations |
title_short |
Improved global sea surface height and current maps from remote sensing and in situ observations |
title_full |
Improved global sea surface height and current maps from remote sensing and in situ observations |
title_fullStr |
Improved global sea surface height and current maps from remote sensing and in situ observations |
title_full_unstemmed |
Improved global sea surface height and current maps from remote sensing and in situ observations |
title_sort |
improved global sea surface height and current maps from remote sensing and in situ observations |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/essd-15-295-2023 https://noa.gwlb.de/receive/cop_mods_00064512 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063278/essd-15-295-2023.pdf https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf |
geographic |
Arctic |
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Arctic |
genre |
Arctic |
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Arctic |
op_relation |
Earth System Science Data -- http://www.earth-syst-sci-data.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2475469 -- 1866-3516 https://doi.org/10.5194/essd-15-295-2023 https://noa.gwlb.de/receive/cop_mods_00064512 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063278/essd-15-295-2023.pdf https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/essd-15-295-2023 |
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Earth System Science Data |
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15 |
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295 |
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315 |
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