Wind-driven submesoscale subduction at the north Pacific subtropical front
Upper ocean observations from the north Pacific subtropical front during late winter demonstrate the generation of submesoscale intrusions by buoyancy loss. Prior to generation, a sharp thermohaline front was intensified by confluent flow of 1–2 × 10−5 s−1. Relative vertical vorticity, ζ, across a s...
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| Veröffentlicht in: | Journal of geophysical research. Oceans 2013-10, Vol.118 (10), p.5333-5352 |
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| creator | Hosegood, P. J. Gregg, M. C. Alford, M. H. |
| description | Upper ocean observations from the north Pacific subtropical front during late winter demonstrate the generation of submesoscale intrusions by buoyancy loss. Prior to generation, a sharp thermohaline front was intensified by confluent flow of 1–2 × 10−5 s−1. Relative vertical vorticity, ζ, across a surface‐intensified, along‐front jet on the warm side of a frontal trough was 0.5 f. During the storm, buoyancy loss arose due to cooling of ∼650 W m−2 and down‐front wind stress |
| doi_str_mv | 10.1002/jgrc.20385 |
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Key Points
Upper ocean submesoscale intrusions were observed at the subtropical front
Fronotogenesis was intensified by buoyancy loss due to cooling and wind stress
Ageostrophic circulations generated the intrusions in a narrow filament</description><identifier>ISSN: 2169-9275</identifier><identifier>EISSN: 2169-9291</identifier><identifier>DOI: 10.1002/jgrc.20385</identifier><language>eng</language><publisher>Hoboken, NJ: Blackwell Publishing Ltd</publisher><subject>Buoyancy ; Circulation ; Cooling ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Filaments ; frontogenesis ; Geophysics ; Intrusion ; intrusions ; Marine ; Oceanography ; Oceans ; Physics of the oceans ; Saline water ; Storms ; Stresses ; subduction ; submesoscale ; Upper ocean ; Wind</subject><ispartof>Journal of geophysical research. Oceans, 2013-10, Vol.118 (10), p.5333-5352</ispartof><rights>2013. The Authors. Journal of Geophysical Research: Oceans published by Wiley on behalf of the American Geophysical Union.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4595-d6e4022ef780a0eaa8c3594851cb08329a9df5edce55702d1d1380e83538f3973</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fjgrc.20385$$EPDF$$P50$$Gwiley$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fjgrc.20385$$EHTML$$P50$$Gwiley$$Hfree_for_read</linktohtml><link.rule.ids>314,776,780,1411,1427,27901,27902,45550,45551,46384,46808</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=28024624$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Hosegood, P. J.</creatorcontrib><creatorcontrib>Gregg, M. C.</creatorcontrib><creatorcontrib>Alford, M. H.</creatorcontrib><title>Wind-driven submesoscale subduction at the north Pacific subtropical front</title><title>Journal of geophysical research. Oceans</title><addtitle>J. Geophys. Res. Oceans</addtitle><description>Upper ocean observations from the north Pacific subtropical front during late winter demonstrate the generation of submesoscale intrusions by buoyancy loss. Prior to generation, a sharp thermohaline front was intensified by confluent flow of 1–2 × 10−5 s−1. Relative vertical vorticity, ζ, across a surface‐intensified, along‐front jet on the warm side of a frontal trough was 0.5 f. During the storm, buoyancy loss arose due to cooling of ∼650 W m−2 and down‐front wind stress <0.5 N m−2 that generated a southward, cross‐front Ekman transport of dense water over light. The resulting wind‐driven buoyancy flux was concentrated at the front where it exceeded that due to convection by an order of magnitude. The intrusions appeared immediately following the storm both within the surface mixed layer and beneath the seasonal pycnocline. They were approximately 20 m thick and horizontally elongated in the cross‐frontal direction. The near‐surface intrusions had cool and fresh properties characteristic of the water underlying the seasonal pycnocline, whereas the subsurface intrusions were composed of warm and saline water from the surface. The apparent vertical exchange was constrained within a thin filament of 2 km zonal extent that was characterized by O(1) Rossby and Richardson numbers, pronounced cyclonic veering in the horizontal velocity throughout the surface mixed layer, and sloping isopycnals. The intrusion properties, background environmental context, and forcing history are consistent with prior numerical modeling results for the generation of ageostrophic vertical circulations by frontogenesis intensified by buoyancy loss, possibly resulting in symmetric instability.
Key Points
Upper ocean submesoscale intrusions were observed at the subtropical front
Fronotogenesis was intensified by buoyancy loss due to cooling and wind stress
Ageostrophic circulations generated the intrusions in a narrow filament</description><subject>Buoyancy</subject><subject>Circulation</subject><subject>Cooling</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Filaments</subject><subject>frontogenesis</subject><subject>Geophysics</subject><subject>Intrusion</subject><subject>intrusions</subject><subject>Marine</subject><subject>Oceanography</subject><subject>Oceans</subject><subject>Physics of the oceans</subject><subject>Saline water</subject><subject>Storms</subject><subject>Stresses</subject><subject>subduction</subject><subject>submesoscale</subject><subject>Upper ocean</subject><subject>Wind</subject><issn>2169-9275</issn><issn>2169-9291</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>24P</sourceid><recordid>eNqFkU9LAzEQxRdRULQXP8GCCF5Wk8mfTY5atFqKWtEWvISYzWrqdrcmu2q_vbu29ODFucyE-b0HkxdFhxidYoTgbPbqzSkgIthWtAeYy0SCxNubOWW7US-EGWpLYEGp3IuGU1dmSebdpy3j0LzMbaiC0YXtHlljaleVsa7j-s3GZeXrt_heG5c70-1rXy1cC8e5r8r6INrJdRFsb933o6ery8f-dTK6G9z0z0eJpkyyJOOWIgCbpwJpZLUWhjBJBcPmBQkCUsssZzYzlrEUQYYzTASygjAiciJTsh-drHwXvvpobKjV3AVji0KXtmqCwpwCgOSS_49SCZxiLmSLHv1BZ1Xjy_aQ1pAIggGhzvB4Tenul3KvS-OCWng3136pQCCgHGjL4RX35Qq73OwxUl1SqktK_SalhoOH_u_UapKVxoXafm802r8rnpKUqentQF2w8eQaxhP1TH4Aa8uVyw</recordid><startdate>201310</startdate><enddate>201310</enddate><creator>Hosegood, P. J.</creator><creator>Gregg, M. C.</creator><creator>Alford, M. H.</creator><general>Blackwell Publishing Ltd</general><general>Wiley</general><scope>BSCLL</scope><scope>24P</scope><scope>IQODW</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>201310</creationdate><title>Wind-driven submesoscale subduction at the north Pacific subtropical front</title><author>Hosegood, P. J. ; Gregg, M. C. ; Alford, M. H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4595-d6e4022ef780a0eaa8c3594851cb08329a9df5edce55702d1d1380e83538f3973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Buoyancy</topic><topic>Circulation</topic><topic>Cooling</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Filaments</topic><topic>frontogenesis</topic><topic>Geophysics</topic><topic>Intrusion</topic><topic>intrusions</topic><topic>Marine</topic><topic>Oceanography</topic><topic>Oceans</topic><topic>Physics of the oceans</topic><topic>Saline water</topic><topic>Storms</topic><topic>Stresses</topic><topic>subduction</topic><topic>submesoscale</topic><topic>Upper ocean</topic><topic>Wind</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hosegood, P. J.</creatorcontrib><creatorcontrib>Gregg, M. C.</creatorcontrib><creatorcontrib>Alford, M. H.</creatorcontrib><collection>Istex</collection><collection>Wiley Online Library Open Access</collection><collection>Pascal-Francis</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of geophysical research. Oceans</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hosegood, P. J.</au><au>Gregg, M. C.</au><au>Alford, M. H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Wind-driven submesoscale subduction at the north Pacific subtropical front</atitle><jtitle>Journal of geophysical research. Oceans</jtitle><addtitle>J. Geophys. Res. Oceans</addtitle><date>2013-10</date><risdate>2013</risdate><volume>118</volume><issue>10</issue><spage>5333</spage><epage>5352</epage><pages>5333-5352</pages><issn>2169-9275</issn><eissn>2169-9291</eissn><abstract>Upper ocean observations from the north Pacific subtropical front during late winter demonstrate the generation of submesoscale intrusions by buoyancy loss. Prior to generation, a sharp thermohaline front was intensified by confluent flow of 1–2 × 10−5 s−1. Relative vertical vorticity, ζ, across a surface‐intensified, along‐front jet on the warm side of a frontal trough was 0.5 f. During the storm, buoyancy loss arose due to cooling of ∼650 W m−2 and down‐front wind stress <0.5 N m−2 that generated a southward, cross‐front Ekman transport of dense water over light. The resulting wind‐driven buoyancy flux was concentrated at the front where it exceeded that due to convection by an order of magnitude. The intrusions appeared immediately following the storm both within the surface mixed layer and beneath the seasonal pycnocline. They were approximately 20 m thick and horizontally elongated in the cross‐frontal direction. The near‐surface intrusions had cool and fresh properties characteristic of the water underlying the seasonal pycnocline, whereas the subsurface intrusions were composed of warm and saline water from the surface. The apparent vertical exchange was constrained within a thin filament of 2 km zonal extent that was characterized by O(1) Rossby and Richardson numbers, pronounced cyclonic veering in the horizontal velocity throughout the surface mixed layer, and sloping isopycnals. The intrusion properties, background environmental context, and forcing history are consistent with prior numerical modeling results for the generation of ageostrophic vertical circulations by frontogenesis intensified by buoyancy loss, possibly resulting in symmetric instability.
Key Points
Upper ocean submesoscale intrusions were observed at the subtropical front
Fronotogenesis was intensified by buoyancy loss due to cooling and wind stress
Ageostrophic circulations generated the intrusions in a narrow filament</abstract><cop>Hoboken, NJ</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/jgrc.20385</doi><tpages>20</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Buoyancy Circulation Cooling Earth, ocean, space Exact sciences and technology External geophysics Filaments frontogenesis Geophysics Intrusion intrusions Marine Oceanography Oceans Physics of the oceans Saline water Storms Stresses subduction submesoscale Upper ocean Wind |
| title | Wind-driven submesoscale subduction at the north Pacific subtropical front |
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