Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation
The North Pacific Subtropical Countercurrent area (STCC) is high in mesoscale eddy activities. According to the rotation direction of the eddy flow field and the sign of temperature anomaly within the eddy, they can be divided into four categories: cyclonic cold-core eddy (CCE), anticyclonic warm-co...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1121731/full |
| _version_ | 1797944944707502080 |
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| author | Wenjin Sun Wenjin Sun Wenjin Sun Wenjin Sun Mengxuan An Jishan Liu Jie Liu Jingsong Yang Jingsong Yang Wei Tan Kenny T. C. Lim Kam Sian Jinlin Ji Jinlin Ji Yu Liu Yu Liu Changming Dong Changming Dong |
| author_facet | Wenjin Sun Wenjin Sun Wenjin Sun Wenjin Sun Mengxuan An Jishan Liu Jie Liu Jingsong Yang Jingsong Yang Wei Tan Kenny T. C. Lim Kam Sian Jinlin Ji Jinlin Ji Yu Liu Yu Liu Changming Dong Changming Dong |
| author_sort | Wenjin Sun |
| collection | DOAJ |
| description | The North Pacific Subtropical Countercurrent area (STCC) is high in mesoscale eddy activities. According to the rotation direction of the eddy flow field and the sign of temperature anomaly within the eddy, they can be divided into four categories: cyclonic cold-core eddy (CCE), anticyclonic warm-core eddy (AWE), cyclonic warm-core eddy (CWE) and anticyclonic cold-core eddy (ACE). CCE and AWE are called normal eddies, and CWE and ACE are named abnormal eddies. Based on the OFES data and vector geometry automatic detection method, we find that at the sea surface, the maximum monthly number of the CCE, AWE, CWE, and ACE occurs in December (765.70 ± 52.05), January (688.20 ± 82.53), August (373.40 ± 43.09) and August (533.00 ± 56.92), respectively. The number of normal eddies is more in winter and spring, and less in summer and autumn, while abnormal eddies have the opposite distribution. The maximum rotation velocity of the four types of eddies appears in June (11.71 ± 0.75 cm/s), June (12.24 ± 0.86 cm/s), May (10.63 ± 0.99 cm/s) and June (9.97 ± 0.91 cm/s), which is fast in winter and spring. The moving speed of the four types of eddies is almost similar (about 10 ~ 11 cm/s). The amplitude of normal and abnormal eddies is both high in summer and autumn, and low in winter and spring, with larger amplitudes in normal than abnormal eddies. The eccentricity (defined as the eccentricity of the ellipse obtained by fitting the eddy boundary) of the four types of eddies is also close to each other, and their variation ranges from 0.7 to 0.8, with no apparent seasonal variation. The vertical penetration depth, which has no significant seasonal difference, is 675.13 ± 67.50 m in cyclonic eddies (CCE and CWE), which is deeper than that 622.32 ± 81.85 m in anticyclonic eddies (ACE and AWE). In addition, increasing the defined temperature threshold for abnormal eddies can significantly reduce their numbers but does not change their seasonal variation trend. |
| first_indexed | 2024-04-10T20:47:36Z |
| format | Article |
| id | doaj.art-0358c5043015401bbe45d19028bfcff1 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-10T20:47:36Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-0358c5043015401bbe45d19028bfcff12023-01-24T05:49:48ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-01-011010.3389/fmars.2023.11217311121731Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variationWenjin Sun0Wenjin Sun1Wenjin Sun2Wenjin Sun3Mengxuan An4Jishan Liu5Jie Liu6Jingsong Yang7Jingsong Yang8Wei Tan9Kenny T. C. Lim Kam Sian10Jinlin Ji11Jinlin Ji12Yu Liu13Yu Liu14Changming Dong15Changming Dong16School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaGEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanySchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaCollege of Ocean Science and Engineering, Shandong University of Science and Technology, Qingdao, ChinaSchool of Atmospheric Science and Remote Sensing, Wuxi University, Wuxi, ChinaSchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, ChinaMarine Science and Technology College, Zhejiang Ocean University, Zhoushan, ChinaSchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, ChinaThe North Pacific Subtropical Countercurrent area (STCC) is high in mesoscale eddy activities. According to the rotation direction of the eddy flow field and the sign of temperature anomaly within the eddy, they can be divided into four categories: cyclonic cold-core eddy (CCE), anticyclonic warm-core eddy (AWE), cyclonic warm-core eddy (CWE) and anticyclonic cold-core eddy (ACE). CCE and AWE are called normal eddies, and CWE and ACE are named abnormal eddies. Based on the OFES data and vector geometry automatic detection method, we find that at the sea surface, the maximum monthly number of the CCE, AWE, CWE, and ACE occurs in December (765.70 ± 52.05), January (688.20 ± 82.53), August (373.40 ± 43.09) and August (533.00 ± 56.92), respectively. The number of normal eddies is more in winter and spring, and less in summer and autumn, while abnormal eddies have the opposite distribution. The maximum rotation velocity of the four types of eddies appears in June (11.71 ± 0.75 cm/s), June (12.24 ± 0.86 cm/s), May (10.63 ± 0.99 cm/s) and June (9.97 ± 0.91 cm/s), which is fast in winter and spring. The moving speed of the four types of eddies is almost similar (about 10 ~ 11 cm/s). The amplitude of normal and abnormal eddies is both high in summer and autumn, and low in winter and spring, with larger amplitudes in normal than abnormal eddies. The eccentricity (defined as the eccentricity of the ellipse obtained by fitting the eddy boundary) of the four types of eddies is also close to each other, and their variation ranges from 0.7 to 0.8, with no apparent seasonal variation. The vertical penetration depth, which has no significant seasonal difference, is 675.13 ± 67.50 m in cyclonic eddies (CCE and CWE), which is deeper than that 622.32 ± 81.85 m in anticyclonic eddies (ACE and AWE). In addition, increasing the defined temperature threshold for abnormal eddies can significantly reduce their numbers but does not change their seasonal variation trend.https://www.frontiersin.org/articles/10.3389/fmars.2023.1121731/fullabnormal eddymesoscale eddyseasonal variationSTCC regionOFES data |
| spellingShingle | Wenjin Sun Wenjin Sun Wenjin Sun Wenjin Sun Mengxuan An Jishan Liu Jie Liu Jingsong Yang Jingsong Yang Wei Tan Kenny T. C. Lim Kam Sian Jinlin Ji Jinlin Ji Yu Liu Yu Liu Changming Dong Changming Dong Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation Frontiers in Marine Science abnormal eddy mesoscale eddy seasonal variation STCC region OFES data |
| title | Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation |
| title_full | Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation |
| title_fullStr | Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation |
| title_full_unstemmed | Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation |
| title_short | Comparative analysis of four types of mesoscale eddies in the North Pacific Subtropical Countercurrent region - part II seasonal variation |
| title_sort | comparative analysis of four types of mesoscale eddies in the north pacific subtropical countercurrent region part ii seasonal variation |
| topic | abnormal eddy mesoscale eddy seasonal variation STCC region OFES data |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1121731/full |
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