The Effect of Arctic Freshwater Pathways on North Atlantic Convection and the Atlantic Meridional Overturning Circulation
This study examines the relative roles of the Arctic freshwater exported via different pathways on deep convection in the North Atlantic and the Atlantic meridional overturning circulation (AMOC). Deep water feeding the lower branch of the AMOC is formed in several North Atlantic marginal seas, incl...
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| Veröffentlicht in: | Journal of climate 2018-07, Vol.31 (13), p.5165-5188 |
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| creator | Wang, He Legg, Sonya Hallberg, Robert |
| description | This study examines the relative roles of the Arctic freshwater exported via different pathways on deep convection in the North Atlantic and the Atlantic meridional overturning circulation (AMOC). Deep water feeding the lower branch of the AMOC is formed in several North Atlantic marginal seas, including the Labrador Sea, Irminger Sea, and the Nordic seas, where deep convection can potentially be inhibited by surface freshwater exported from the Arctic. The sensitivity of the AMOC and North Atlantic to two major freshwater pathways on either side of Greenland is studied using numerical experiments. Freshwater export is rerouted in global coupled climate models by blocking and expanding the channels along the two routes. The sensitivity experiments are performed in two sets of models (CM2G and CM2M) with different control simulation climatology for comparison. Freshwater via the route east of Greenland is found to have a larger direct impact on Labrador Sea convection. In response to the changes of freshwater route, North Atlantic convection outside of the Labrador Sea changes in the opposite sense to the Labrador Sea. The response of the AMOC is found to be sensitive to both the model formulation and mean-state climate. |
| doi_str_mv | 10.1175/JCLI-D-17-0629.1 |
| format | Article |
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Deep water feeding the lower branch of the AMOC is formed in several North Atlantic marginal seas, including the Labrador Sea, Irminger Sea, and the Nordic seas, where deep convection can potentially be inhibited by surface freshwater exported from the Arctic. The sensitivity of the AMOC and North Atlantic to two major freshwater pathways on either side of Greenland is studied using numerical experiments. Freshwater export is rerouted in global coupled climate models by blocking and expanding the channels along the two routes. The sensitivity experiments are performed in two sets of models (CM2G and CM2M) with different control simulation climatology for comparison. Freshwater via the route east of Greenland is found to have a larger direct impact on Labrador Sea convection. In response to the changes of freshwater route, North Atlantic convection outside of the Labrador Sea changes in the opposite sense to the Labrador Sea. 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Deep water feeding the lower branch of the AMOC is formed in several North Atlantic marginal seas, including the Labrador Sea, Irminger Sea, and the Nordic seas, where deep convection can potentially be inhibited by surface freshwater exported from the Arctic. The sensitivity of the AMOC and North Atlantic to two major freshwater pathways on either side of Greenland is studied using numerical experiments. Freshwater export is rerouted in global coupled climate models by blocking and expanding the channels along the two routes. The sensitivity experiments are performed in two sets of models (CM2G and CM2M) with different control simulation climatology for comparison. Freshwater via the route east of Greenland is found to have a larger direct impact on Labrador Sea convection. In response to the changes of freshwater route, North Atlantic convection outside of the Labrador Sea changes in the opposite sense to the Labrador Sea. The response of the AMOC is found to be sensitive to both the model formulation and mean-state climate.</description><subject>Atlantic Meridional Overturning Circulation (AMOC)</subject><subject>Boundary layer</subject><subject>Climate</subject><subject>Climate models</subject><subject>Climatology</subject><subject>Computer simulation</subject><subject>Control simulation</subject><subject>Convection</subject><subject>Deep water</subject><subject>Deep water circulation</subject><subject>Experiments</subject><subject>Fresh water</subject><subject>Freshwater</subject><subject>Global climate</subject><subject>Inland water environment</subject><subject>Marginal seas</subject><subject>Numerical experiments</subject><subject>Ocean circulation</subject><subject>Ocean currents</subject><subject>Salinity</subject><subject>Sensitivity</subject><subject>Surface water</subject><subject>Water 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Effect of Arctic Freshwater Pathways on North Atlantic Convection and the Atlantic Meridional Overturning Circulation</title><author>Wang, He ; Legg, Sonya ; Hallberg, Robert</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c293t-628e083b8eef2a8efdc6c878cd5e6842f81ea1c510c7a7e988404556d8624de93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Atlantic Meridional Overturning Circulation (AMOC)</topic><topic>Boundary layer</topic><topic>Climate</topic><topic>Climate models</topic><topic>Climatology</topic><topic>Computer simulation</topic><topic>Control simulation</topic><topic>Convection</topic><topic>Deep water</topic><topic>Deep water circulation</topic><topic>Experiments</topic><topic>Fresh water</topic><topic>Freshwater</topic><topic>Global climate</topic><topic>Inland water environment</topic><topic>Marginal seas</topic><topic>Numerical experiments</topic><topic>Ocean circulation</topic><topic>Ocean currents</topic><topic>Salinity</topic><topic>Sensitivity</topic><topic>Surface water</topic><topic>Water circulation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, He</creatorcontrib><creatorcontrib>Legg, Sonya</creatorcontrib><creatorcontrib>Hallberg, Robert</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Aqualine</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Agricultural Science Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Military Database (Alumni Edition)</collection><collection>Science Database (Alumni Edition)</collection><collection>STEM Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology 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Circulation</atitle><jtitle>Journal of climate</jtitle><date>2018-07-01</date><risdate>2018</risdate><volume>31</volume><issue>13</issue><spage>5165</spage><epage>5188</epage><pages>5165-5188</pages><issn>0894-8755</issn><eissn>1520-0442</eissn><abstract>This study examines the relative roles of the Arctic freshwater exported via different pathways on deep convection in the North Atlantic and the Atlantic meridional overturning circulation (AMOC). Deep water feeding the lower branch of the AMOC is formed in several North Atlantic marginal seas, including the Labrador Sea, Irminger Sea, and the Nordic seas, where deep convection can potentially be inhibited by surface freshwater exported from the Arctic. The sensitivity of the AMOC and North Atlantic to two major freshwater pathways on either side of Greenland is studied using numerical experiments. Freshwater export is rerouted in global coupled climate models by blocking and expanding the channels along the two routes. The sensitivity experiments are performed in two sets of models (CM2G and CM2M) with different control simulation climatology for comparison. Freshwater via the route east of Greenland is found to have a larger direct impact on Labrador Sea convection. In response to the changes of freshwater route, North Atlantic convection outside of the Labrador Sea changes in the opposite sense to the Labrador Sea. The response of the AMOC is found to be sensitive to both the model formulation and mean-state climate.</abstract><cop>Boston</cop><pub>American Meteorological Society</pub><doi>10.1175/JCLI-D-17-0629.1</doi><tpages>24</tpages></addata></record> |
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| subjects | Atlantic Meridional Overturning Circulation (AMOC) Boundary layer Climate Climate models Climatology Computer simulation Control simulation Convection Deep water Deep water circulation Experiments Fresh water Freshwater Global climate Inland water environment Marginal seas Numerical experiments Ocean circulation Ocean currents Salinity Sensitivity Surface water Water circulation |
| title | The Effect of Arctic Freshwater Pathways on North Atlantic Convection and the Atlantic Meridional Overturning Circulation |
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