Mid-depth mixing linked to North Atlantic Current variability
Repeated observations at the subpolar front west of the Mid‐Atlantic Ridge show a link between the position of the North Atlantic Current (NAC) and the spatial distribution of fine‐scale variance, diapycnal diffusivity, and integrated energy dissipation. Observational data were collected during thre...
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| Veröffentlicht in: | Geophysical research letters 2013-09, Vol.40 (18), p.4869-4875 |
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| creator | Walter, Maren Mertens, Christian |
| description | Repeated observations at the subpolar front west of the Mid‐Atlantic Ridge show a link between the position of the North Atlantic Current (NAC) and the spatial distribution of fine‐scale variance, diapycnal diffusivity, and integrated energy dissipation. Observational data were collected during three cruises. A single branch of the NAC was found in 2008, approximately at 50°30′N, and two branches were observed in 2010 and 2011, with alternating intensities. Shear variance was elevated below the core of the NAC in all cases, resulting in an average diapycnal diffusivity that is higher by a factor of 3 compared to the averages north and south of the NAC. The integrated energy dissipation has maxima at or south of the fronts; background dissipation is highest during 2008, also the year with the highest surface eddy kinetic energy.
Key Points
Observations show enhanced open ocean mixing below North Atlantic Current coreLocation of mixing changes with position of NAC/Mid Atlantic Ridge interactionIntegrated energy dissipation corresponds to surface eddy kinetic energy |
| doi_str_mv | 10.1002/grl.50936 |
| format | Article |
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Key Points
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Key Points
Observations show enhanced open ocean mixing below North Atlantic Current coreLocation of mixing changes with position of NAC/Mid Atlantic Ridge interactionIntegrated energy dissipation corresponds to surface eddy kinetic energy</description><subject>Cruises</subject><subject>Depth</subject><subject>Diffusion coefficients</subject><subject>Diffusivity</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Eddy kinetic energy</subject><subject>Energy dissipation</subject><subject>Energy distribution</subject><subject>Energy exchange</subject><subject>Exact sciences and technology</subject><subject>fine structure</subject><subject>Fronts</subject><subject>Geophysics</subject><subject>Kinetic energy</subject><subject>Kinetics</subject><subject>Marine</subject><subject>Mid-ocean ridges</subject><subject>mixing</subject><subject>North Atlantic Current</subject><subject>Ocean currents</subject><subject>Oceans</subject><subject>Position (location)</subject><subject>Ridges</subject><subject>Shear</subject><subject>Spatial distribution</subject><subject>Variability</subject><subject>Variance</subject><subject>Vortices</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqFkc1OGzEUhS1EpQbaRd9gJIREFwPX4_8FCxTRFCkFWhWytDweT3CYzAR70pK3ryFpFkjAxrauvnN0jw9CXzAcY4DiZBqaYwaK8B00wIrSXAKIXTQAUOldCP4R7cU4AwACBA_Q6Q9f5ZVb9HfZ3D_6dpo1vr13VdZ32WUX0visb0zbe5sNlyG4ts_-mOBN6Rvfrz6hD7Vpovu8uffRzbfz38Pv-fhqdDE8G-eWKspz6aQplam5oBgEE5RbIUpc12VFiGLpgJoXBaulK2lZKVI5LCTFZYmlZcaSfXS09l2E7mHpYq_nPlrXpM1ct4wac4E5AYyL91FWKMWAcUjowQt01i1Dm4JorNKiXFIu3qQ4LYDI9NuJ-rqmbOhiDK7Wi-DnJqw0Bv3UjE7N6OdmEnu4cTTRmqYOprU-bgWFkJJx-RTlZM399Y1bvW6oR7_G_53ztcLH3j1uFSbc65REMD25HOlbyq9_TiagJ-Qf6pOoow</recordid><startdate>20130928</startdate><enddate>20130928</enddate><creator>Walter, Maren</creator><creator>Mertens, Christian</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>7SU</scope><scope>C1K</scope></search><sort><creationdate>20130928</creationdate><title>Mid-depth mixing linked to North Atlantic Current variability</title><author>Walter, Maren ; Mertens, Christian</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4946-8e8ab9af6741075746c77b1ffbd3395d330f6225f8eb4bd93de17841bb18c5ac3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Cruises</topic><topic>Depth</topic><topic>Diffusion coefficients</topic><topic>Diffusivity</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Eddy kinetic energy</topic><topic>Energy dissipation</topic><topic>Energy distribution</topic><topic>Energy exchange</topic><topic>Exact sciences and technology</topic><topic>fine structure</topic><topic>Fronts</topic><topic>Geophysics</topic><topic>Kinetic energy</topic><topic>Kinetics</topic><topic>Marine</topic><topic>Mid-ocean ridges</topic><topic>mixing</topic><topic>North Atlantic Current</topic><topic>Ocean currents</topic><topic>Oceans</topic><topic>Position (location)</topic><topic>Ridges</topic><topic>Shear</topic><topic>Spatial distribution</topic><topic>Variability</topic><topic>Variance</topic><topic>Vortices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Walter, Maren</creatorcontrib><creatorcontrib>Mertens, Christian</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environmental Engineering Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Walter, Maren</au><au>Mertens, Christian</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mid-depth mixing linked to North Atlantic Current variability</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2013-09-28</date><risdate>2013</risdate><volume>40</volume><issue>18</issue><spage>4869</spage><epage>4875</epage><pages>4869-4875</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>Repeated observations at the subpolar front west of the Mid‐Atlantic Ridge show a link between the position of the North Atlantic Current (NAC) and the spatial distribution of fine‐scale variance, diapycnal diffusivity, and integrated energy dissipation. Observational data were collected during three cruises. A single branch of the NAC was found in 2008, approximately at 50°30′N, and two branches were observed in 2010 and 2011, with alternating intensities. Shear variance was elevated below the core of the NAC in all cases, resulting in an average diapycnal diffusivity that is higher by a factor of 3 compared to the averages north and south of the NAC. The integrated energy dissipation has maxima at or south of the fronts; background dissipation is highest during 2008, also the year with the highest surface eddy kinetic energy.
Key Points
Observations show enhanced open ocean mixing below North Atlantic Current coreLocation of mixing changes with position of NAC/Mid Atlantic Ridge interactionIntegrated energy dissipation corresponds to surface eddy kinetic energy</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/grl.50936</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Cruises Depth Diffusion coefficients Diffusivity Earth sciences Earth, ocean, space Eddy kinetic energy Energy dissipation Energy distribution Energy exchange Exact sciences and technology fine structure Fronts Geophysics Kinetic energy Kinetics Marine Mid-ocean ridges mixing North Atlantic Current Ocean currents Oceans Position (location) Ridges Shear Spatial distribution Variability Variance Vortices |
| title | Mid-depth mixing linked to North Atlantic Current variability |
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