Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 633-647, doi:10.1175/JPO-D-16-0089.1. In...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8915 2023-05-15T17:32:02+02:00 Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation Evans, Dafydd Gwyn Toole, John M. Forget, Gael Zika, Jan D. Naveira Garabato, Alberto C. Nurser, A. J. George Yu, Lisan 2017-03-17 https://hdl.handle.net/1912/8915 en_US eng American Meteorological Society https://doi.org/10.1175/JPO-D-16-0089.1 Journal of Physical Oceanography 47 (2017): 633-647 https://hdl.handle.net/1912/8915 doi:10.1175/JPO-D-16-0089.1 Journal of Physical Oceanography 47 (2017): 633-647 doi:10.1175/JPO-D-16-0089.1 North Atlantic Ocean Atmosphere-ocean interaction Ekman pumping/transport Ocean circulation Water masses Inverse methods Article 2017 ftwhoas https://doi.org/10.1175/JPO-D-16-0089.1 2022-05-28T22:59:54Z Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 633-647, doi:10.1175/JPO-D-16-0089.1. Interannual variability in the volumetric water mass distribution within the North Atlantic Subtropical Gyre is described in relation to variability in the Atlantic meridional overturning circulation. The relative roles of diabatic and adiabatic processes in the volume and heat budgets of the subtropical gyre are investigated by projecting data into temperature coordinates as volumes of water using an Argo-based climatology and an ocean state estimate (ECCO version 4). This highlights that variations in the subtropical gyre volume budget are predominantly set by transport divergence in the gyre. A strong correlation between the volume anomaly due to transport divergence and the variability of both thermocline depth and Ekman pumping over the gyre suggests that wind-driven heave drives transport anomalies at the gyre boundaries. This wind-driven heaving contributes significantly to variations in the heat content of the gyre, as do anomalies in the air–sea fluxes. The analysis presented suggests that wind forcing plays an important role in driving interannual variability in the Atlantic meridional overturning circulation and that this variability can be unraveled from spatially distributed hydrographic observations using the framework presented here. DGE was supported by a Natural Environment Research Council studentship award at the University of Southampton. JMT’s contribution was supported by the U.S. National Science Foundation (Grant OCE-1332667). GF’s contribution was supported by the U.S. National Science Foundation through Grant OCE-0961713 and by the U.S. National Oceanic and Atmospheric Administration through Grant NA10OAR4310135. The contributions of JDZ and AJGN were supported by the NERC Grant ‘‘Climate ... Article in Journal/Newspaper North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Physical Oceanography 47 3 633 647 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
North Atlantic Ocean Atmosphere-ocean interaction Ekman pumping/transport Ocean circulation Water masses Inverse methods |
spellingShingle |
North Atlantic Ocean Atmosphere-ocean interaction Ekman pumping/transport Ocean circulation Water masses Inverse methods Evans, Dafydd Gwyn Toole, John M. Forget, Gael Zika, Jan D. Naveira Garabato, Alberto C. Nurser, A. J. George Yu, Lisan Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation |
topic_facet |
North Atlantic Ocean Atmosphere-ocean interaction Ekman pumping/transport Ocean circulation Water masses Inverse methods |
description |
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 633-647, doi:10.1175/JPO-D-16-0089.1. Interannual variability in the volumetric water mass distribution within the North Atlantic Subtropical Gyre is described in relation to variability in the Atlantic meridional overturning circulation. The relative roles of diabatic and adiabatic processes in the volume and heat budgets of the subtropical gyre are investigated by projecting data into temperature coordinates as volumes of water using an Argo-based climatology and an ocean state estimate (ECCO version 4). This highlights that variations in the subtropical gyre volume budget are predominantly set by transport divergence in the gyre. A strong correlation between the volume anomaly due to transport divergence and the variability of both thermocline depth and Ekman pumping over the gyre suggests that wind-driven heave drives transport anomalies at the gyre boundaries. This wind-driven heaving contributes significantly to variations in the heat content of the gyre, as do anomalies in the air–sea fluxes. The analysis presented suggests that wind forcing plays an important role in driving interannual variability in the Atlantic meridional overturning circulation and that this variability can be unraveled from spatially distributed hydrographic observations using the framework presented here. DGE was supported by a Natural Environment Research Council studentship award at the University of Southampton. JMT’s contribution was supported by the U.S. National Science Foundation (Grant OCE-1332667). GF’s contribution was supported by the U.S. National Science Foundation through Grant OCE-0961713 and by the U.S. National Oceanic and Atmospheric Administration through Grant NA10OAR4310135. The contributions of JDZ and AJGN were supported by the NERC Grant ‘‘Climate ... |
format |
Article in Journal/Newspaper |
author |
Evans, Dafydd Gwyn Toole, John M. Forget, Gael Zika, Jan D. Naveira Garabato, Alberto C. Nurser, A. J. George Yu, Lisan |
author_facet |
Evans, Dafydd Gwyn Toole, John M. Forget, Gael Zika, Jan D. Naveira Garabato, Alberto C. Nurser, A. J. George Yu, Lisan |
author_sort |
Evans, Dafydd Gwyn |
title |
Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation |
title_short |
Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation |
title_full |
Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation |
title_fullStr |
Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation |
title_full_unstemmed |
Recent wind-driven variability in Atlantic water mass distribution and meridional overturning circulation |
title_sort |
recent wind-driven variability in atlantic water mass distribution and meridional overturning circulation |
publisher |
American Meteorological Society |
publishDate |
2017 |
url |
https://hdl.handle.net/1912/8915 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Physical Oceanography 47 (2017): 633-647 doi:10.1175/JPO-D-16-0089.1 |
op_relation |
https://doi.org/10.1175/JPO-D-16-0089.1 Journal of Physical Oceanography 47 (2017): 633-647 https://hdl.handle.net/1912/8915 doi:10.1175/JPO-D-16-0089.1 |
op_doi |
https://doi.org/10.1175/JPO-D-16-0089.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
47 |
container_issue |
3 |
container_start_page |
633 |
op_container_end_page |
647 |
_version_ |
1766129951218597888 |