Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission
Modern seawater profiles of oxygen, nitrate deficit, and nitrogen isotopes reveal the spatial decoupling of summer monsoon-related productivity and denitrification maxima in the Arabian Sea (AS) and raise the possibility that winter monsoon and/or ventilation play a crucial role in modulating denitr...
Published in: | Global Biogeochemical Cycles |
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Online Access: | https://archimer.ifremer.fr/doc/00233/34461/32865.pdf https://doi.org/10.1029/2006GB002852 https://archimer.ifremer.fr/doc/00233/34461/ |
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ftarchimer:oai:archimer.ifremer.fr:34461 2023-05-15T13:50:50+02:00 Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission Pichevin, Laetitia Bard, Edouard Martinez, Philippe Billy, Isabelle 2007-10 application/pdf https://archimer.ifremer.fr/doc/00233/34461/32865.pdf https://doi.org/10.1029/2006GB002852 https://archimer.ifremer.fr/doc/00233/34461/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00233/34461/32865.pdf doi:10.1029/2006GB002852 https://archimer.ifremer.fr/doc/00233/34461/ Copyright 2007 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2007-10 , Vol. 21 , N. 4/GB4008 , P. 1-12 marine N cycle abrupt climate changes Arabian Sea text Publication info:eu-repo/semantics/article 2007 ftarchimer https://doi.org/10.1029/2006GB002852 2021-09-23T20:25:21Z Modern seawater profiles of oxygen, nitrate deficit, and nitrogen isotopes reveal the spatial decoupling of summer monsoon-related productivity and denitrification maxima in the Arabian Sea (AS) and raise the possibility that winter monsoon and/or ventilation play a crucial role in modulating denitrification in the northeastern AS, both today and through the past. A new high-resolution 50-ka record of delta(15) N from the Pakistan margin is compared to five other denitrification records distributed across the AS. This regional comparison unveils the persistence of east-west heterogeneities in denitrification intensity across millennial-scale climate shifts and throughout the Holocene. The oxygen minimum zone (OMZ) experienced east-west swings across Termination I and throughout the Holocene. Probable causes are (1) changes in ventilation due to millennial-scale variations in Antarctic Intermediate Water formation and (2) postglacial reorganization of intermediate circulation in the northeastern AS following sea level rise. Whereas denitrification in the world's OMZs, including the western AS, gradually declined following the deglacial maximum (10-9 ka BP), the northeastern AS record clearly witnesses increasing denitrification from about 8 ka BP. This would have impacted the global Holocene climate through sustained N2O production and marine nitrogen loss. Article in Journal/Newspaper Antarc* Antarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Global Biogeochemical Cycles 21 4 n/a n/a |
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 |
topic |
marine N cycle abrupt climate changes Arabian Sea |
spellingShingle |
marine N cycle abrupt climate changes Arabian Sea Pichevin, Laetitia Bard, Edouard Martinez, Philippe Billy, Isabelle Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission |
topic_facet |
marine N cycle abrupt climate changes Arabian Sea |
description |
Modern seawater profiles of oxygen, nitrate deficit, and nitrogen isotopes reveal the spatial decoupling of summer monsoon-related productivity and denitrification maxima in the Arabian Sea (AS) and raise the possibility that winter monsoon and/or ventilation play a crucial role in modulating denitrification in the northeastern AS, both today and through the past. A new high-resolution 50-ka record of delta(15) N from the Pakistan margin is compared to five other denitrification records distributed across the AS. This regional comparison unveils the persistence of east-west heterogeneities in denitrification intensity across millennial-scale climate shifts and throughout the Holocene. The oxygen minimum zone (OMZ) experienced east-west swings across Termination I and throughout the Holocene. Probable causes are (1) changes in ventilation due to millennial-scale variations in Antarctic Intermediate Water formation and (2) postglacial reorganization of intermediate circulation in the northeastern AS following sea level rise. Whereas denitrification in the world's OMZs, including the western AS, gradually declined following the deglacial maximum (10-9 ka BP), the northeastern AS record clearly witnesses increasing denitrification from about 8 ka BP. This would have impacted the global Holocene climate through sustained N2O production and marine nitrogen loss. |
format |
Article in Journal/Newspaper |
author |
Pichevin, Laetitia Bard, Edouard Martinez, Philippe Billy, Isabelle |
author_facet |
Pichevin, Laetitia Bard, Edouard Martinez, Philippe Billy, Isabelle |
author_sort |
Pichevin, Laetitia |
title |
Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission |
title_short |
Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission |
title_full |
Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission |
title_fullStr |
Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission |
title_full_unstemmed |
Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission |
title_sort |
evidence of ventilation changes in the arabian sea during the late quaternary: implication for denitrification and nitrous oxide emission |
publisher |
Amer Geophysical Union |
publishDate |
2007 |
url |
https://archimer.ifremer.fr/doc/00233/34461/32865.pdf https://doi.org/10.1029/2006GB002852 https://archimer.ifremer.fr/doc/00233/34461/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2007-10 , Vol. 21 , N. 4/GB4008 , P. 1-12 |
op_relation |
https://archimer.ifremer.fr/doc/00233/34461/32865.pdf doi:10.1029/2006GB002852 https://archimer.ifremer.fr/doc/00233/34461/ |
op_rights |
Copyright 2007 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2006GB002852 |
container_title |
Global Biogeochemical Cycles |
container_volume |
21 |
container_issue |
4 |
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1766254128626925568 |