Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension
The three-dimensional structure of a supercharged cold eddy, which showed strong temperature anomaly, was continuously investigated for 83 days based on current- and pressure-equipped inverted echo sounder observations in the Kuroshio Extension region. The eddy was generated on December 9, 2004, she...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-12-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.1079178/full |
| _version_ | 1811203165894213632 |
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| author | Xinyu Zhang Hua Zheng Hua Zheng Xiao-Hua Zhu Xiao-Hua Zhu Xiao-Hua Zhu Ruixiang Zhao Cong Xiao Min Wang Min Wang Juntian Chen Juntian Chen |
| author_facet | Xinyu Zhang Hua Zheng Hua Zheng Xiao-Hua Zhu Xiao-Hua Zhu Xiao-Hua Zhu Ruixiang Zhao Cong Xiao Min Wang Min Wang Juntian Chen Juntian Chen |
| author_sort | Xinyu Zhang |
| collection | DOAJ |
| description | The three-dimensional structure of a supercharged cold eddy, which showed strong temperature anomaly, was continuously investigated for 83 days based on current- and pressure-equipped inverted echo sounder observations in the Kuroshio Extension region. The eddy was generated on December 9, 2004, shed from the Kuroshio approximately 30 days later, and moved out of the observation area on March 1, 2005. During the stable period, the eddy had a radius of approximately 60–80 km, a depth of approximately 3,000 m, and a westward speed of 7.4 km/d. The maximum temperature anomaly in the eddy center reached -9.1°C at 360 dbar, whereas the minimum (maximum) salinity anomaly reached -0.68 (0.20) psu at 340 (780) dbar. Under the stream function coordinate, the kinetic energy of the eddy first increased and then decreased from the center to boundary, whereas the vorticity decreased overall. Energy budget analysis showed that eddy energy mainly originated from the Kuroshio during eddy formation by advection, whereas the baroclinic conversion (BC) and barotropic conversion (BT) played a dissipative role. After the eddy had been completely separated from the Kuroshio, the mean flow energy was transferred to eddy energy through BC and BT, which further enhanced eddy potential energy and eddy kinetic energy. |
| first_indexed | 2024-04-12T02:49:54Z |
| format | Article |
| id | doaj.art-bfe9277f8fd04c4888f64b470e8e93de |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-12T02:49:54Z |
| publishDate | 2022-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-bfe9277f8fd04c4888f64b470e8e93de2022-12-22T03:51:01ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-12-01910.3389/fmars.2022.10791781079178Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio ExtensionXinyu Zhang0Hua Zheng1Hua Zheng2Xiao-Hua Zhu3Xiao-Hua Zhu4Xiao-Hua Zhu5Ruixiang Zhao6Cong Xiao7Min Wang8Min Wang9Juntian Chen10Juntian Chen11State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaSchool of Oceanography, Shanghai Jiao Tong University, Shanghai, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaSchool of Oceanography, Shanghai Jiao Tong University, Shanghai, ChinaOcean College, Zhejiang University, Zhoushan, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaSchool of Oceanography, Shanghai Jiao Tong University, Shanghai, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaOcean College, Zhejiang University, Zhoushan, ChinaThe three-dimensional structure of a supercharged cold eddy, which showed strong temperature anomaly, was continuously investigated for 83 days based on current- and pressure-equipped inverted echo sounder observations in the Kuroshio Extension region. The eddy was generated on December 9, 2004, shed from the Kuroshio approximately 30 days later, and moved out of the observation area on March 1, 2005. During the stable period, the eddy had a radius of approximately 60–80 km, a depth of approximately 3,000 m, and a westward speed of 7.4 km/d. The maximum temperature anomaly in the eddy center reached -9.1°C at 360 dbar, whereas the minimum (maximum) salinity anomaly reached -0.68 (0.20) psu at 340 (780) dbar. Under the stream function coordinate, the kinetic energy of the eddy first increased and then decreased from the center to boundary, whereas the vorticity decreased overall. Energy budget analysis showed that eddy energy mainly originated from the Kuroshio during eddy formation by advection, whereas the baroclinic conversion (BC) and barotropic conversion (BT) played a dissipative role. After the eddy had been completely separated from the Kuroshio, the mean flow energy was transferred to eddy energy through BC and BT, which further enhanced eddy potential energy and eddy kinetic energy.https://www.frontiersin.org/articles/10.3389/fmars.2022.1079178/fullmesoscale eddythree-dimensional structureeddy-flow interactioneddy evolutionkuroshio extension |
| spellingShingle | Xinyu Zhang Hua Zheng Hua Zheng Xiao-Hua Zhu Xiao-Hua Zhu Xiao-Hua Zhu Ruixiang Zhao Cong Xiao Min Wang Min Wang Juntian Chen Juntian Chen Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension Frontiers in Marine Science mesoscale eddy three-dimensional structure eddy-flow interaction eddy evolution kuroshio extension |
| title | Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension |
| title_full | Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension |
| title_fullStr | Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension |
| title_full_unstemmed | Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension |
| title_short | Anatomical study of the three-dimensional structure of a supercharged cold eddy generated in the Kuroshio Extension |
| title_sort | anatomical study of the three dimensional structure of a supercharged cold eddy generated in the kuroshio extension |
| topic | mesoscale eddy three-dimensional structure eddy-flow interaction eddy evolution kuroshio extension |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.1079178/full |
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