Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling

Abstract Nitrous oxide (N2O) is a climate relevant trace gas, and its production in the ocean generally increases under suboxic conditions. The Atlantic Ocean is well ventilated, and unlike the major oxygen minimum zones (OMZ) of the Pacific and Indian Oceans, dissolved oxygen and N2O concentrations...

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Autores principales:	D. S. Grundle, C. R. Löscher, G. Krahmann, M. A. Altabet, H. W. Bange, J. Karstensen, A. Körtzinger, B. Fiedler
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a9d9b0a3961f411097b4f7e5b204d1e5
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spelling	oai:doaj.org-article:a9d9b0a3961f411097b4f7e5b204d1e52021-12-02T11:40:52ZLow oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling10.1038/s41598-017-04745-y2045-2322https://doaj.org/article/a9d9b0a3961f411097b4f7e5b204d1e52017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04745-yhttps://doaj.org/toc/2045-2322Abstract Nitrous oxide (N2O) is a climate relevant trace gas, and its production in the ocean generally increases under suboxic conditions. The Atlantic Ocean is well ventilated, and unlike the major oxygen minimum zones (OMZ) of the Pacific and Indian Oceans, dissolved oxygen and N2O concentrations in the Atlantic OMZ are relatively high and low, respectively. This study, however, demonstrates that recently discovered low oxygen eddies in the eastern tropical North Atlantic (ETNA) can produce N2O concentrations much higher (up to 115 nmol L−1) than those previously reported for the Atlantic Ocean, and which are within the range of the highest concentrations found in the open-ocean OMZs of the Pacific and Indian Oceans. N2O isotope and isotopomer signatures, as well as molecular genetic results, also point towards a major shift in the N2O cycling pathway in the core of the low oxygen eddy discussed here, and we report the first evidence for potential N2O cycling via the denitrification pathway in the open Atlantic Ocean. Finally, we consider the implications of low oxygen eddies for bulk, upper water column N2O at the regional scale, and point out the possible need for a reevaluation of how we view N2O cycling in the ETNA.D. S. GrundleC. R. LöscherG. KrahmannM. A. AltabetH. W. BangeJ. KarstensenA. KörtzingerB. FiedlerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q D. S. Grundle C. R. Löscher G. Krahmann M. A. Altabet H. W. Bange J. Karstensen A. Körtzinger B. Fiedler Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
description	Abstract Nitrous oxide (N2O) is a climate relevant trace gas, and its production in the ocean generally increases under suboxic conditions. The Atlantic Ocean is well ventilated, and unlike the major oxygen minimum zones (OMZ) of the Pacific and Indian Oceans, dissolved oxygen and N2O concentrations in the Atlantic OMZ are relatively high and low, respectively. This study, however, demonstrates that recently discovered low oxygen eddies in the eastern tropical North Atlantic (ETNA) can produce N2O concentrations much higher (up to 115 nmol L−1) than those previously reported for the Atlantic Ocean, and which are within the range of the highest concentrations found in the open-ocean OMZs of the Pacific and Indian Oceans. N2O isotope and isotopomer signatures, as well as molecular genetic results, also point towards a major shift in the N2O cycling pathway in the core of the low oxygen eddy discussed here, and we report the first evidence for potential N2O cycling via the denitrification pathway in the open Atlantic Ocean. Finally, we consider the implications of low oxygen eddies for bulk, upper water column N2O at the regional scale, and point out the possible need for a reevaluation of how we view N2O cycling in the ETNA.
format	article
author	D. S. Grundle C. R. Löscher G. Krahmann M. A. Altabet H. W. Bange J. Karstensen A. Körtzinger B. Fiedler
author_facet	D. S. Grundle C. R. Löscher G. Krahmann M. A. Altabet H. W. Bange J. Karstensen A. Körtzinger B. Fiedler
author_sort	D. S. Grundle
title	Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
title_short	Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
title_full	Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
title_fullStr	Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
title_full_unstemmed	Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
title_sort	low oxygen eddies in the eastern tropical north atlantic: implications for n2o cycling
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/a9d9b0a3961f411097b4f7e5b204d1e5
work_keys_str_mv	AT dsgrundle lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT crloscher lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT gkrahmann lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT maaltabet lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT hwbange lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT jkarstensen lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT akortzinger lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling AT bfiedler lowoxygeneddiesintheeasterntropicalnorthatlanticimplicationsforn2ocycling
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Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling

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