Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension
Vigorous mesoscale eddies are broadly distributed in the Kuroshio Extension and can generally be identified from sea surface height (SSH) and sea surface temperature (SST) fields. Nevertheless, the changes in SSH and SST caused by mesoscale eddies and their seasonal correlation in the Kuroshio Exten...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/22/5776 |
| _version_ | 1797464075832131584 |
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| author | Wei Cui Jungang Yang Yongjun Jia Jie Zhang |
| author_facet | Wei Cui Jungang Yang Yongjun Jia Jie Zhang |
| author_sort | Wei Cui |
| collection | DOAJ |
| description | Vigorous mesoscale eddies are broadly distributed in the Kuroshio Extension and can generally be identified from sea surface height (SSH) and sea surface temperature (SST) fields. Nevertheless, the changes in SSH and SST caused by mesoscale eddies and their seasonal correlation in the Kuroshio Extension are not clear, as well as the difference between identified eddy results from the two data. Combining in situ Argo float profiles data, the correlation between SSH anomaly (SSHA) and SST anomaly (SSTA) signals in mesoscale eddies are analyzed. The result shows that SSTA–SSHA signals inside eddies are generally more correlated in winter than in summer. Argo subsurface temperature anomalies <i>θ′</i> and SSHA signals inside eddies show a high correlation, with a regression coefficient <i>θ′</i>/SSHA of about 7 °C·m<sup>−1</sup>, while correlations of Argo <i>θ′</i>–SSTA inside eddies are low. Generally, the lifetime and propagation distance of SSTA-based eddies are shorter and smaller than those of SSHA-based eddies, which may be related to the rapid changes in SSTA field and the interference of small-scale oceanic signal in the SST field. Comparing with SSHA-based eddies, which exist primarily around the region of the Kuroshio mainstream (33°–36°N), SSTA-based eddies are concentrated in the Oyashio Extension (39°–42°N), where SST gradient is large, and changes in SST fields caused by mesoscale eddies are more obvious and more likely to be captured by satellites there. In addition, the geographical distributions of SSHA- and SSTA-based eddy amplitudes are consistent with the absolute dynamic topography and SST gradient. |
| first_indexed | 2024-03-09T18:01:46Z |
| format | Article |
| id | doaj.art-2be0aec65d4248e89cd3f5101fd7bf0e |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T18:01:46Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-2be0aec65d4248e89cd3f5101fd7bf0e2023-11-24T09:50:16ZengMDPI AGRemote Sensing2072-42922022-11-011422577610.3390/rs14225776Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio ExtensionWei Cui0Jungang Yang1Yongjun Jia2Jie Zhang3First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, ChinaFirst Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, ChinaNational Satellite Ocean Application Service, Beijing 100081, ChinaFirst Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, ChinaVigorous mesoscale eddies are broadly distributed in the Kuroshio Extension and can generally be identified from sea surface height (SSH) and sea surface temperature (SST) fields. Nevertheless, the changes in SSH and SST caused by mesoscale eddies and their seasonal correlation in the Kuroshio Extension are not clear, as well as the difference between identified eddy results from the two data. Combining in situ Argo float profiles data, the correlation between SSH anomaly (SSHA) and SST anomaly (SSTA) signals in mesoscale eddies are analyzed. The result shows that SSTA–SSHA signals inside eddies are generally more correlated in winter than in summer. Argo subsurface temperature anomalies <i>θ′</i> and SSHA signals inside eddies show a high correlation, with a regression coefficient <i>θ′</i>/SSHA of about 7 °C·m<sup>−1</sup>, while correlations of Argo <i>θ′</i>–SSTA inside eddies are low. Generally, the lifetime and propagation distance of SSTA-based eddies are shorter and smaller than those of SSHA-based eddies, which may be related to the rapid changes in SSTA field and the interference of small-scale oceanic signal in the SST field. Comparing with SSHA-based eddies, which exist primarily around the region of the Kuroshio mainstream (33°–36°N), SSTA-based eddies are concentrated in the Oyashio Extension (39°–42°N), where SST gradient is large, and changes in SST fields caused by mesoscale eddies are more obvious and more likely to be captured by satellites there. In addition, the geographical distributions of SSHA- and SSTA-based eddy amplitudes are consistent with the absolute dynamic topography and SST gradient.https://www.mdpi.com/2072-4292/14/22/5776mesoscale eddysea surface heightsea surface temperatureKuroshio Extension |
| spellingShingle | Wei Cui Jungang Yang Yongjun Jia Jie Zhang Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension Remote Sensing mesoscale eddy sea surface height sea surface temperature Kuroshio Extension |
| title | Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension |
| title_full | Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension |
| title_fullStr | Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension |
| title_full_unstemmed | Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension |
| title_short | Oceanic Eddy Detection and Analysis from Satellite-Derived SSH and SST Fields in the Kuroshio Extension |
| title_sort | oceanic eddy detection and analysis from satellite derived ssh and sst fields in the kuroshio extension |
| topic | mesoscale eddy sea surface height sea surface temperature Kuroshio Extension |
| url | https://www.mdpi.com/2072-4292/14/22/5776 |
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