Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling
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 A...
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Nature Research
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ftoceanrep:oai:oceanrep.geomar.de:38835 2023-05-15T17:30:20+02:00 Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling Grundle, Damian S. Löscher, Carolin R. Krahmann, Gerd Altabet, M. A. Bange, Hermann W. Karstensen, Johannes Körtzinger, Arne Fiedler, Björn 2017-07-06 text https://oceanrep.geomar.de/id/eprint/38835/ https://oceanrep.geomar.de/id/eprint/38835/1/Grundle_2017.pdf https://oceanrep.geomar.de/id/eprint/38835/7/s41598-018-22120-3.pdf https://doi.org/10.1038/s41598-017-04745-y en eng Nature Research https://oceanrep.geomar.de/id/eprint/38835/1/Grundle_2017.pdf https://oceanrep.geomar.de/id/eprint/38835/7/s41598-018-22120-3.pdf Grundle, D. S., Löscher, C. R., Krahmann, G. , Altabet, M. A., Bange, H. W. , Karstensen, J. , Körtzinger, A. and Fiedler, B. (2017) Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling. Open Access Scientific Reports, 7 (1). Art.Nr. 4806. DOI 10.1038/s41598-017-04745-y <https://doi.org/10.1038/s41598-017-04745-y>. doi:10.1038/s41598-017-04745-y cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.1038/s41598-017-04745-y 2023-04-07T15:34:28Z 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. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Indian Pacific Scientific Reports 7 1 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
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 in Journal/Newspaper |
author |
Grundle, Damian S. Löscher, Carolin R. Krahmann, Gerd Altabet, M. A. Bange, Hermann W. Karstensen, Johannes Körtzinger, Arne Fiedler, Björn |
spellingShingle |
Grundle, Damian S. Löscher, Carolin R. Krahmann, Gerd Altabet, M. A. Bange, Hermann W. Karstensen, Johannes Körtzinger, Arne Fiedler, Björn Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling |
author_facet |
Grundle, Damian S. Löscher, Carolin R. Krahmann, Gerd Altabet, M. A. Bange, Hermann W. Karstensen, Johannes Körtzinger, Arne Fiedler, Björn |
author_sort |
Grundle, Damian S. |
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 Research |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/38835/ https://oceanrep.geomar.de/id/eprint/38835/1/Grundle_2017.pdf https://oceanrep.geomar.de/id/eprint/38835/7/s41598-018-22120-3.pdf https://doi.org/10.1038/s41598-017-04745-y |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/38835/1/Grundle_2017.pdf https://oceanrep.geomar.de/id/eprint/38835/7/s41598-018-22120-3.pdf Grundle, D. S., Löscher, C. R., Krahmann, G. , Altabet, M. A., Bange, H. W. , Karstensen, J. , Körtzinger, A. and Fiedler, B. (2017) Low oxygen eddies in the eastern tropical North Atlantic: Implications for N2O cycling. Open Access Scientific Reports, 7 (1). Art.Nr. 4806. DOI 10.1038/s41598-017-04745-y <https://doi.org/10.1038/s41598-017-04745-y>. doi:10.1038/s41598-017-04745-y |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41598-017-04745-y |
container_title |
Scientific Reports |
container_volume |
7 |
container_issue |
1 |
_version_ |
1766126694017531904 |