Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007
© The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 10 (2013): 6783-6792, doi:10.5194/bg-10-6783-2013. Microbial nitrous oxide (N2O) production in the ocean is enhanced under low-oxygen...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6385 2023-05-15T17:05:18+02:00 Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 Kim, I.-N. Lee, K. Bange, Hermann W. Macdonald, Alison M. 2013-11-01 application/pdf https://hdl.handle.net/1912/6385 en_US eng Copernicus Publications on behalf of the European Geosciences Union https://doi.org/10.5194/bg-10-6783-2013 Biogeosciences 10 (2013): 6783-6792 https://hdl.handle.net/1912/6385 doi:10.5194/bg-10-6783-2013 Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ CC-BY Biogeosciences 10 (2013): 6783-6792 doi:10.5194/bg-10-6783-2013 Article 2013 ftwhoas https://doi.org/10.5194/bg-10-6783-2013 2022-05-28T22:59:01Z © The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 10 (2013): 6783-6792, doi:10.5194/bg-10-6783-2013. Microbial nitrous oxide (N2O) production in the ocean is enhanced under low-oxygen (O2) conditions. This is especially important in the context of increasing hypoxia (i.e., oceanic zones with extremely reduced O2 concentrations). Here, we present a study on the interannual variation in summertime nitrous oxide (N2O) concentrations in the bottom waters of the northern Gulf of Mexico (nGOM), which is well-known as the site of the second largest seasonally occurring hypoxic zone worldwide. To this end we developed a simple model that computes bottom-water N2O concentrations with a tri-linear ΔN2O/O2 relationship based on water-column O2 concentrations, derived from summer (July) Texas–Louisiana shelf-wide hydrographic data between 1985 and 2007. ΔN2O (i.e., excess N2O) was computed including nitrification and denitrification as the major microbial production and consumption pathways of N2O. The mean modeled bottom-water N2O concentration for July in the nGOM was 14.5 ± 2.3 nmol L−1 (min: 11.0 ± 4.5 nmol L−1 in 2000 and max: 20.6 ± 11.3 nmol L−1 in 2002). The mean bottom-water N2O concentrations were significantly correlated with the areal extent of hypoxia in the nGOM. Our modeling analysis indicates that the nGOM is a persistent summer source of N2O, and nitrification is dominating N2O production in this region. Based on the ongoing increase in the areal extent of hypoxia in the nGOM, we conclude that N2O production (and its subsequent emissions) from this environmentally stressed region will probably continue to increase into the future. The preparation of the manuscript was supported by the Mid-career Research Program of the Korea National Research Foundation (No. 2012R1A2A1A01004631) and by Polar Academy Program of the Korea Polar Research Institute. Partial support was also provided by the ... Article in Journal/Newspaper Korea Polar Research Institute Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Biogeosciences 10 11 6783 6792 |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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English |
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© The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 10 (2013): 6783-6792, doi:10.5194/bg-10-6783-2013. Microbial nitrous oxide (N2O) production in the ocean is enhanced under low-oxygen (O2) conditions. This is especially important in the context of increasing hypoxia (i.e., oceanic zones with extremely reduced O2 concentrations). Here, we present a study on the interannual variation in summertime nitrous oxide (N2O) concentrations in the bottom waters of the northern Gulf of Mexico (nGOM), which is well-known as the site of the second largest seasonally occurring hypoxic zone worldwide. To this end we developed a simple model that computes bottom-water N2O concentrations with a tri-linear ΔN2O/O2 relationship based on water-column O2 concentrations, derived from summer (July) Texas–Louisiana shelf-wide hydrographic data between 1985 and 2007. ΔN2O (i.e., excess N2O) was computed including nitrification and denitrification as the major microbial production and consumption pathways of N2O. The mean modeled bottom-water N2O concentration for July in the nGOM was 14.5 ± 2.3 nmol L−1 (min: 11.0 ± 4.5 nmol L−1 in 2000 and max: 20.6 ± 11.3 nmol L−1 in 2002). The mean bottom-water N2O concentrations were significantly correlated with the areal extent of hypoxia in the nGOM. Our modeling analysis indicates that the nGOM is a persistent summer source of N2O, and nitrification is dominating N2O production in this region. Based on the ongoing increase in the areal extent of hypoxia in the nGOM, we conclude that N2O production (and its subsequent emissions) from this environmentally stressed region will probably continue to increase into the future. The preparation of the manuscript was supported by the Mid-career Research Program of the Korea National Research Foundation (No. 2012R1A2A1A01004631) and by Polar Academy Program of the Korea Polar Research Institute. Partial support was also provided by the ... |
format |
Article in Journal/Newspaper |
author |
Kim, I.-N. Lee, K. Bange, Hermann W. Macdonald, Alison M. |
spellingShingle |
Kim, I.-N. Lee, K. Bange, Hermann W. Macdonald, Alison M. Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 |
author_facet |
Kim, I.-N. Lee, K. Bange, Hermann W. Macdonald, Alison M. |
author_sort |
Kim, I.-N. |
title |
Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 |
title_short |
Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 |
title_full |
Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 |
title_fullStr |
Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 |
title_full_unstemmed |
Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985–2007 |
title_sort |
interannual variation in summer n2o concentration in the hypoxic region of the northern gulf of mexico, 1985–2007 |
publisher |
Copernicus Publications on behalf of the European Geosciences Union |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/6385 |
genre |
Korea Polar Research Institute |
genre_facet |
Korea Polar Research Institute |
op_source |
Biogeosciences 10 (2013): 6783-6792 doi:10.5194/bg-10-6783-2013 |
op_relation |
https://doi.org/10.5194/bg-10-6783-2013 Biogeosciences 10 (2013): 6783-6792 https://hdl.handle.net/1912/6385 doi:10.5194/bg-10-6783-2013 |
op_rights |
Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-10-6783-2013 |
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Biogeosciences |
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10 |
container_issue |
11 |
container_start_page |
6783 |
op_container_end_page |
6792 |
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1766059780546232320 |