The geometry of mesoscale eddies in the South China Sea: characteristics and implications
The symmetrical circular shape of mesoscale eddies has been widely used in their scientific researches. Recently, an elliptical average eddy shape has been confirmed for eddies in the global ocean using multi-satellite altimeter data. As a regional extension of a previous study on the geometry of gl...
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| Veröffentlicht in: | International journal of digital earth 2021-04, Vol.14 (4), p.464-479 |
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| creator | Han, Guiyan Tian, Fenglin Ma, Chunyong Chen, Ge |
| description | The symmetrical circular shape of mesoscale eddies has been widely used in their scientific researches. Recently, an elliptical average eddy shape has been confirmed for eddies in the global ocean using multi-satellite altimeter data. As a regional extension of a previous study on the geometry of global eddies, a mean eddy shape in the South China Sea (SCS) has been derived by averaging a large number of orientational eddy boundaries. The mean shape is approximately a mathematic ellipse with a semimajor axis of 101.3 km and a semiminor axis of 61.3 km. Its size is larger than the global one. The principal eddy orientation in the SCS is 74°/254° (nearly northeast-southwest), different from that of eddies in the global ocean (171°/351°, nearly east-west). Composite analyses of chlorophyll (CHL) concentrations and sea surface temperature anomalies (SSTA) indicate a dipole structure for circular eddies in the non-rotated coordinate system. While a monopole structure for elliptical eddies in the eddy-centric coordinate system is obtained. The results demonstrate that the elliptical shape of eddies affects oceanographical variables. The findings provide a new approach for exploring the role of air-sea interactions on oceanic eddies. |
| doi_str_mv | 10.1080/17538947.2020.1842523 |
| format | Article |
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Recently, an elliptical average eddy shape has been confirmed for eddies in the global ocean using multi-satellite altimeter data. As a regional extension of a previous study on the geometry of global eddies, a mean eddy shape in the South China Sea (SCS) has been derived by averaging a large number of orientational eddy boundaries. The mean shape is approximately a mathematic ellipse with a semimajor axis of 101.3 km and a semiminor axis of 61.3 km. Its size is larger than the global one. The principal eddy orientation in the SCS is 74°/254° (nearly northeast-southwest), different from that of eddies in the global ocean (171°/351°, nearly east-west). Composite analyses of chlorophyll (CHL) concentrations and sea surface temperature anomalies (SSTA) indicate a dipole structure for circular eddies in the non-rotated coordinate system. While a monopole structure for elliptical eddies in the eddy-centric coordinate system is obtained. The results demonstrate that the elliptical shape of eddies affects oceanographical variables. The findings provide a new approach for exploring the role of air-sea interactions on oceanic eddies.</description><identifier>ISSN: 1753-8947</identifier><identifier>EISSN: 1753-8955</identifier><identifier>DOI: 10.1080/17538947.2020.1842523</identifier><language>eng</language><publisher>Abingdon: Taylor & Francis</publisher><subject>Altimeters ; Anomalies ; Chlorophyll ; Chlorophylls ; Coordinate systems ; Coordinates ; Dipoles ; Eddies ; eddy orientation ; eddy shape ; Mathematical analysis ; Mathematics ; Mesoscale eddies ; Mesoscale phenomena ; Ocean circulation ; Oceanic eddies ; Sea surface ; Sea surface temperature ; Shape ; South China Sea ; Temperature anomalies ; Vortices</subject><ispartof>International journal of digital earth, 2021-04, Vol.14 (4), p.464-479</ispartof><rights>2021 Informa UK Limited, trading as Taylor & Francis Group 2021</rights><rights>2021 Informa UK Limited, trading as Taylor & Francis Group</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c451t-f99e082f4ff60874a0899ebc2c0a1468815ad575c488fc350426db666446dbf83</citedby><cites>FETCH-LOGICAL-c451t-f99e082f4ff60874a0899ebc2c0a1468815ad575c488fc350426db666446dbf83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,778,782,27911,27912</link.rule.ids></links><search><creatorcontrib>Han, Guiyan</creatorcontrib><creatorcontrib>Tian, Fenglin</creatorcontrib><creatorcontrib>Ma, Chunyong</creatorcontrib><creatorcontrib>Chen, Ge</creatorcontrib><title>The geometry of mesoscale eddies in the South China Sea: characteristics and implications</title><title>International journal of digital earth</title><description>The symmetrical circular shape of mesoscale eddies has been widely used in their scientific researches. Recently, an elliptical average eddy shape has been confirmed for eddies in the global ocean using multi-satellite altimeter data. As a regional extension of a previous study on the geometry of global eddies, a mean eddy shape in the South China Sea (SCS) has been derived by averaging a large number of orientational eddy boundaries. The mean shape is approximately a mathematic ellipse with a semimajor axis of 101.3 km and a semiminor axis of 61.3 km. Its size is larger than the global one. The principal eddy orientation in the SCS is 74°/254° (nearly northeast-southwest), different from that of eddies in the global ocean (171°/351°, nearly east-west). Composite analyses of chlorophyll (CHL) concentrations and sea surface temperature anomalies (SSTA) indicate a dipole structure for circular eddies in the non-rotated coordinate system. While a monopole structure for elliptical eddies in the eddy-centric coordinate system is obtained. The results demonstrate that the elliptical shape of eddies affects oceanographical variables. The findings provide a new approach for exploring the role of air-sea interactions on oceanic eddies.</description><subject>Altimeters</subject><subject>Anomalies</subject><subject>Chlorophyll</subject><subject>Chlorophylls</subject><subject>Coordinate systems</subject><subject>Coordinates</subject><subject>Dipoles</subject><subject>Eddies</subject><subject>eddy orientation</subject><subject>eddy shape</subject><subject>Mathematical analysis</subject><subject>Mathematics</subject><subject>Mesoscale eddies</subject><subject>Mesoscale phenomena</subject><subject>Ocean circulation</subject><subject>Oceanic eddies</subject><subject>Sea surface</subject><subject>Sea surface temperature</subject><subject>Shape</subject><subject>South China Sea</subject><subject>Temperature anomalies</subject><subject>Vortices</subject><issn>1753-8947</issn><issn>1753-8955</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>DOA</sourceid><recordid>eNp9kctKAzEUhgdRsF4eQQi4ruY6k3GlFG8guFAXrsKZXNqUmUlNUqRvb2rVpasTPv7z5cBfVWcEXxAs8SVpBJMtby4opgVJTgVle9Vky6eyFWL_782bw-oopSXGNeacTar314VFcxsGm-MGBYcGm0LS0FtkjfE2IT-iXDIvYZ0XaLbwI6AXC1dILyCCzjb6lL1OCEaD_LDqvYbsw5hOqgMHfbKnP_O4eru7fZ09TJ-e7x9nN09TzQXJU9e2FkvquHM1lg0HLAvpNNUYCK-lJAKMaITmUjrNBOa0Nl1d15yX6SQ7rh53XhNgqVbRDxA3KoBX3yDEuYJYLuyt6hwvXgOsYzWXnZG0sxIXSnjTNJ0orvOdaxXDx9qmrJZhHcdyvqICt4TglrGSEruUjiGlaN3frwSrbSPqtxG1bUT9NFL2rnd7fnQhDvAZYm9Uhk0fooswap8U-1_xBaR_kX8</recordid><startdate>20210403</startdate><enddate>20210403</enddate><creator>Han, Guiyan</creator><creator>Tian, Fenglin</creator><creator>Ma, Chunyong</creator><creator>Chen, Ge</creator><general>Taylor & Francis</general><general>Taylor & Francis Ltd</general><general>Taylor & Francis Group</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>SOI</scope><scope>DOA</scope></search><sort><creationdate>20210403</creationdate><title>The geometry of mesoscale eddies in the South China Sea: characteristics and implications</title><author>Han, Guiyan ; 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Recently, an elliptical average eddy shape has been confirmed for eddies in the global ocean using multi-satellite altimeter data. As a regional extension of a previous study on the geometry of global eddies, a mean eddy shape in the South China Sea (SCS) has been derived by averaging a large number of orientational eddy boundaries. The mean shape is approximately a mathematic ellipse with a semimajor axis of 101.3 km and a semiminor axis of 61.3 km. Its size is larger than the global one. The principal eddy orientation in the SCS is 74°/254° (nearly northeast-southwest), different from that of eddies in the global ocean (171°/351°, nearly east-west). Composite analyses of chlorophyll (CHL) concentrations and sea surface temperature anomalies (SSTA) indicate a dipole structure for circular eddies in the non-rotated coordinate system. While a monopole structure for elliptical eddies in the eddy-centric coordinate system is obtained. 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| subjects | Altimeters Anomalies Chlorophyll Chlorophylls Coordinate systems Coordinates Dipoles Eddies eddy orientation eddy shape Mathematical analysis Mathematics Mesoscale eddies Mesoscale phenomena Ocean circulation Oceanic eddies Sea surface Sea surface temperature Shape South China Sea Temperature anomalies Vortices |
| title | The geometry of mesoscale eddies in the South China Sea: characteristics and implications |
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