A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage
Uptake of atmospheric carbon by the ocean, especially at high latitudes, plays an important role in offsetting anthropogenic emissions. At the surface of the Southern Ocean south of 30(circle)S, the ocean carbon uptake, which had been weakening in 1990s, strengthened in the 2000s. However, sparsenes...
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ftarchimer:oai:archimer.ifremer.fr:90003 2023-05-15T18:24:16+02:00 A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage Zemskova, Varvara E. He, Tai-long Wan, Zirui Grisouard, Nicolas 2022-07 application/pdf https://archimer.ifremer.fr/doc/00788/90003/95566.pdf https://archimer.ifremer.fr/doc/00788/90003/95567.pdf https://doi.org/10.1038/s41467-022-31560-5 https://archimer.ifremer.fr/doc/00788/90003/ eng eng Nature Portfolio https://archimer.ifremer.fr/doc/00788/90003/95566.pdf https://archimer.ifremer.fr/doc/00788/90003/95567.pdf doi:10.1038/s41467-022-31560-5 https://archimer.ifremer.fr/doc/00788/90003/ info:eu-repo/semantics/openAccess restricted use Nature Communications (2041-1723) (Nature Portfolio), 2022-07 , Vol. 13 , N. 1 , P. 4056 (11p.) text Publication info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.1038/s41467-022-31560-5 2022-08-23T22:50:29Z Uptake of atmospheric carbon by the ocean, especially at high latitudes, plays an important role in offsetting anthropogenic emissions. At the surface of the Southern Ocean south of 30(circle)S, the ocean carbon uptake, which had been weakening in 1990s, strengthened in the 2000s. However, sparseness of in-situ measurements in the ocean interior make it difficult to compute changes in carbon storage below the surface. Here we develop a machine-learning model, which can estimate concentrations of dissolved inorganic carbon (DIC) in the Southern Ocean up to 4 km depth only using data available at the ocean surface. Our model is fast and computationally inexpensive. We apply it to calculate trends in DIC concentrations over the past three decades and find that DIC decreased in the 1990s and 2000s, but has increased, in particular in the upper ocean since the 2010s. However, the particular circulation dynamics that drove these changes may have differed across zonal sectors of the Southern Ocean. While the near-surface decrease in DIC concentrations would enhance atmospheric CO2 uptake continuing the previously-found trends, weakened connectivity between surface and deep layers and build-up of DIC in deep waters could reduce the ocean's carbon storage potential. Dissolved carbon concentrations in the ocean interior are computed by a deep-learning model using ocean surface data. In the Southern Ocean, they decreased in the 1990s-2000s and increased since 2010, reducing anthropogenic carbon uptake potential. Article in Journal/Newspaper Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Southern Ocean Nature Communications 13 1 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Uptake of atmospheric carbon by the ocean, especially at high latitudes, plays an important role in offsetting anthropogenic emissions. At the surface of the Southern Ocean south of 30(circle)S, the ocean carbon uptake, which had been weakening in 1990s, strengthened in the 2000s. However, sparseness of in-situ measurements in the ocean interior make it difficult to compute changes in carbon storage below the surface. Here we develop a machine-learning model, which can estimate concentrations of dissolved inorganic carbon (DIC) in the Southern Ocean up to 4 km depth only using data available at the ocean surface. Our model is fast and computationally inexpensive. We apply it to calculate trends in DIC concentrations over the past three decades and find that DIC decreased in the 1990s and 2000s, but has increased, in particular in the upper ocean since the 2010s. However, the particular circulation dynamics that drove these changes may have differed across zonal sectors of the Southern Ocean. While the near-surface decrease in DIC concentrations would enhance atmospheric CO2 uptake continuing the previously-found trends, weakened connectivity between surface and deep layers and build-up of DIC in deep waters could reduce the ocean's carbon storage potential. Dissolved carbon concentrations in the ocean interior are computed by a deep-learning model using ocean surface data. In the Southern Ocean, they decreased in the 1990s-2000s and increased since 2010, reducing anthropogenic carbon uptake potential. |
format |
Article in Journal/Newspaper |
author |
Zemskova, Varvara E. He, Tai-long Wan, Zirui Grisouard, Nicolas |
spellingShingle |
Zemskova, Varvara E. He, Tai-long Wan, Zirui Grisouard, Nicolas A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage |
author_facet |
Zemskova, Varvara E. He, Tai-long Wan, Zirui Grisouard, Nicolas |
author_sort |
Zemskova, Varvara E. |
title |
A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage |
title_short |
A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage |
title_full |
A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage |
title_fullStr |
A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage |
title_full_unstemmed |
A deep-learning estimate of the decadal trends in the Southern Ocean carbon storage |
title_sort |
deep-learning estimate of the decadal trends in the southern ocean carbon storage |
publisher |
Nature Portfolio |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00788/90003/95566.pdf https://archimer.ifremer.fr/doc/00788/90003/95567.pdf https://doi.org/10.1038/s41467-022-31560-5 https://archimer.ifremer.fr/doc/00788/90003/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Nature Communications (2041-1723) (Nature Portfolio), 2022-07 , Vol. 13 , N. 1 , P. 4056 (11p.) |
op_relation |
https://archimer.ifremer.fr/doc/00788/90003/95566.pdf https://archimer.ifremer.fr/doc/00788/90003/95567.pdf doi:10.1038/s41467-022-31560-5 https://archimer.ifremer.fr/doc/00788/90003/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41467-022-31560-5 |
container_title |
Nature Communications |
container_volume |
13 |
container_issue |
1 |
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1766204672651034624 |