Efficient dissolved organic carbon production and export in the oligotrophic ocean

Biologically fixed carbon is transferred from the surface to deep ocean as sinking particles or dissolved organic carbon (DOC). DOC is estimated to account for ~20% of global export production, but the degree to which this varies regionally has not been assessed at a global scale. Here we present th...

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Autores principales: Roshan, Saeed, DeVries, Timothy
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5725454/
https://www.ncbi.nlm.nih.gov/pubmed/29230041
http://dx.doi.org/10.1038/s41467-017-02227-3
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author Roshan, Saeed
DeVries, Timothy
author_facet Roshan, Saeed
DeVries, Timothy
author_sort Roshan, Saeed
collection PubMed
description Biologically fixed carbon is transferred from the surface to deep ocean as sinking particles or dissolved organic carbon (DOC). DOC is estimated to account for ~20% of global export production, but the degree to which this varies regionally has not been assessed at a global scale. Here we present the first observationally based global-scale assessment of DOC production and export, obtained by combining an artificial neural network estimate of the global DOC distribution, and a data-constrained ocean circulation model. Our results demonstrate that the efficiency of DOC production and export varies more than threefold across oceanographic regions. DOC production and export display a pronounced peak in the oligotrophic subtropical oceans, where DOC accounts for roughly half of the total organic carbon export. These stratified nutrient-depleted regions are expected to expand with future warming, amplifying the role of DOC in the biological pump, and magnifying the need to improve DOC cycling in climate models.
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spelling pubmed-57254542017-12-14 Efficient dissolved organic carbon production and export in the oligotrophic ocean Roshan, Saeed DeVries, Timothy Nat Commun Article Biologically fixed carbon is transferred from the surface to deep ocean as sinking particles or dissolved organic carbon (DOC). DOC is estimated to account for ~20% of global export production, but the degree to which this varies regionally has not been assessed at a global scale. Here we present the first observationally based global-scale assessment of DOC production and export, obtained by combining an artificial neural network estimate of the global DOC distribution, and a data-constrained ocean circulation model. Our results demonstrate that the efficiency of DOC production and export varies more than threefold across oceanographic regions. DOC production and export display a pronounced peak in the oligotrophic subtropical oceans, where DOC accounts for roughly half of the total organic carbon export. These stratified nutrient-depleted regions are expected to expand with future warming, amplifying the role of DOC in the biological pump, and magnifying the need to improve DOC cycling in climate models. Nature Publishing Group UK 2017-12-11 /pmc/articles/PMC5725454/ /pubmed/29230041 http://dx.doi.org/10.1038/s41467-017-02227-3 Text en © The Author(s) 2017 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Roshan, Saeed
DeVries, Timothy
Efficient dissolved organic carbon production and export in the oligotrophic ocean
title Efficient dissolved organic carbon production and export in the oligotrophic ocean
title_full Efficient dissolved organic carbon production and export in the oligotrophic ocean
title_fullStr Efficient dissolved organic carbon production and export in the oligotrophic ocean
title_full_unstemmed Efficient dissolved organic carbon production and export in the oligotrophic ocean
title_short Efficient dissolved organic carbon production and export in the oligotrophic ocean
title_sort efficient dissolved organic carbon production and export in the oligotrophic ocean
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5725454/
https://www.ncbi.nlm.nih.gov/pubmed/29230041
http://dx.doi.org/10.1038/s41467-017-02227-3
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