Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008
Author Posting. © Macmillan Publishers, 2009. This is the author's version of the work. It is posted here by permission of Macmillan Publishers for personal use, not for redistribution. The definitive version was published in Nature Geoscience 2 (2009): 67-72, doi:10.1038/ngeo382. The process o...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/2840 2023-05-15T17:06:11+02:00 Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 Våge, Kjetil Pickart, Robert S. Thierry, Virginie Reverdin, Gilles Lee, Craig M. Petrie, Brian Agnew, Tom A. Wong, Amy Ribergaard, Mads H. 2008-11-07 application/pdf https://hdl.handle.net/1912/2840 en_US eng https://doi.org/10.1038/ngeo382 https://hdl.handle.net/1912/2840 Preprint 2008 ftwhoas https://doi.org/10.1038/ngeo382 2022-05-28T22:57:44Z Author Posting. © Macmillan Publishers, 2009. This is the author's version of the work. It is posted here by permission of Macmillan Publishers for personal use, not for redistribution. The definitive version was published in Nature Geoscience 2 (2009): 67-72, doi:10.1038/ngeo382. The process of open-ocean convection in the subpolar North Atlantic Ocean forms a dense water mass that impacts the meridional overturning circulation and heat flux, and sequesters atmospheric carbon. In recent years the convection has been shallow or nonexistent, which could be construed as a consequence of a warmer climate. However, in the winter of 2007-08 deep convection returned to the subpolar gyre in both the Labrador and Irminger Seas. Here we document this return and elucidate the reasons why it happened. Profiling float data from the Argo programme are used to document the deep mixing, and a variety of in-situ, satellite, and reanalysis products are analyzed to describe the conditions leading to the overturning. The transition to a convective state took place abruptly, without going through a preconditioning phase, which is contrary to general expectations. Changes in the hemispheric air temperature, tracks of storms, flux of freshwater to the Labrador Sea, and distribution of pack ice all conspired to enhance the air-sea heat flux, resulting in the deep overturning. This study illuminates the complexity of the North Atlantic convective system. Support for this work was provided by the Ocean Sciences Division of the National Science Foundation. Report Labrador Sea North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Nature Geoscience 2 1 67 72 |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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Author Posting. © Macmillan Publishers, 2009. This is the author's version of the work. It is posted here by permission of Macmillan Publishers for personal use, not for redistribution. The definitive version was published in Nature Geoscience 2 (2009): 67-72, doi:10.1038/ngeo382. The process of open-ocean convection in the subpolar North Atlantic Ocean forms a dense water mass that impacts the meridional overturning circulation and heat flux, and sequesters atmospheric carbon. In recent years the convection has been shallow or nonexistent, which could be construed as a consequence of a warmer climate. However, in the winter of 2007-08 deep convection returned to the subpolar gyre in both the Labrador and Irminger Seas. Here we document this return and elucidate the reasons why it happened. Profiling float data from the Argo programme are used to document the deep mixing, and a variety of in-situ, satellite, and reanalysis products are analyzed to describe the conditions leading to the overturning. The transition to a convective state took place abruptly, without going through a preconditioning phase, which is contrary to general expectations. Changes in the hemispheric air temperature, tracks of storms, flux of freshwater to the Labrador Sea, and distribution of pack ice all conspired to enhance the air-sea heat flux, resulting in the deep overturning. This study illuminates the complexity of the North Atlantic convective system. Support for this work was provided by the Ocean Sciences Division of the National Science Foundation. |
format |
Report |
author |
Våge, Kjetil Pickart, Robert S. Thierry, Virginie Reverdin, Gilles Lee, Craig M. Petrie, Brian Agnew, Tom A. Wong, Amy Ribergaard, Mads H. |
spellingShingle |
Våge, Kjetil Pickart, Robert S. Thierry, Virginie Reverdin, Gilles Lee, Craig M. Petrie, Brian Agnew, Tom A. Wong, Amy Ribergaard, Mads H. Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 |
author_facet |
Våge, Kjetil Pickart, Robert S. Thierry, Virginie Reverdin, Gilles Lee, Craig M. Petrie, Brian Agnew, Tom A. Wong, Amy Ribergaard, Mads H. |
author_sort |
Våge, Kjetil |
title |
Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 |
title_short |
Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 |
title_full |
Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 |
title_fullStr |
Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 |
title_full_unstemmed |
Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008 |
title_sort |
surprising return of deep convection to the subpolar north atlantic ocean in winter 2007–2008 |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/2840 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
https://doi.org/10.1038/ngeo382 https://hdl.handle.net/1912/2840 |
op_doi |
https://doi.org/10.1038/ngeo382 |
container_title |
Nature Geoscience |
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2 |
container_issue |
1 |
container_start_page |
67 |
op_container_end_page |
72 |
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1766061208947916800 |