Improved global sea surface height and current maps from remote sensing and in situ observations
<p>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 product...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-01-01
|
| Series: | Earth System Science Data |
| Online Access: | https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf |
| _version_ | 1797950917038833664 |
|---|---|
| author | M. Ballarotta C. Ubelmann P. Veillard P. Prandi H. Etienne S. Mulet Y. Faugère G. Dibarboure R. Morrow N. Picot |
| author_facet | M. Ballarotta C. Ubelmann P. Veillard P. Prandi H. Etienne S. Mulet Y. Faugère G. Dibarboure R. Morrow N. Picot |
| author_sort | M. Ballarotta |
| collection | DOAJ |
| description | <p>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 (<span class="uri">https://doi.org/10.48670/moi-00148</span>, Pujol et al., 2022b).</p> |
| first_indexed | 2024-04-10T22:22:39Z |
| format | Article |
| id | doaj.art-05eedfa7940e4b368f9a0bbdb1021c8b |
| institution | Directory Open Access Journal |
| issn | 1866-3508 1866-3516 |
| language | English |
| last_indexed | 2024-04-10T22:22:39Z |
| publishDate | 2023-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth System Science Data |
| spelling | doaj.art-05eedfa7940e4b368f9a0bbdb1021c8b2023-01-17T13:11:20ZengCopernicus PublicationsEarth System Science Data1866-35081866-35162023-01-011529531510.5194/essd-15-295-2023Improved global sea surface height and current maps from remote sensing and in situ observationsM. Ballarotta0C. Ubelmann1P. Veillard2P. Prandi3H. Etienne4S. Mulet5Y. Faugère6G. Dibarboure7R. Morrow8N. Picot9Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, FranceDatlas, 38400 Saint Martin d'Hères, FranceCollecte Localisation Satellites, 31520 Ramonville-Saint-Agne, FranceCollecte Localisation Satellites, 31520 Ramonville-Saint-Agne, FranceCollecte Localisation Satellites, 31520 Ramonville-Saint-Agne, FranceCollecte Localisation Satellites, 31520 Ramonville-Saint-Agne, FranceCollecte Localisation Satellites, 31520 Ramonville-Saint-Agne, FranceCentre National d'Études Spatiales, 31400 Toulouse, FranceCentre de Topographie des Océans et de l'Hydrosphère, Laboratoire d'Etudes en Géophysique et Océanographie Spatiale, CNRS, CNES, IRD, Université Toulouse III, Toulouse, FranceCentre National d'Études Spatiales, 31400 Toulouse, France<p>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 (<span class="uri">https://doi.org/10.48670/moi-00148</span>, Pujol et al., 2022b).</p>https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf |
| spellingShingle | M. Ballarotta C. Ubelmann P. Veillard P. Prandi H. Etienne S. Mulet Y. Faugère G. Dibarboure R. Morrow N. Picot Improved global sea surface height and current maps from remote sensing and in situ observations Earth System Science Data |
| title | 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_short | 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 |
| url | https://essd.copernicus.org/articles/15/295/2023/essd-15-295-2023.pdf |
| work_keys_str_mv | AT mballarotta improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT cubelmann improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT pveillard improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT pprandi improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT hetienne improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT smulet improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT yfaugere improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT gdibarboure improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT rmorrow improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations AT npicot improvedglobalseasurfaceheightandcurrentmapsfromremotesensingandinsituobservations |