The eddy pair off eastern Vietnam: Interannual variability and impact on thermohaline structure |
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Authors: | Gengxin Chen Yijun Hou Qilong Zhang Xiaoqing Chu |
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Institution: | 1. Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, Shandong, China;2. Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China;3. Graduate University of Chinese Academy of Sciences, Beijing 100039,China |
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Abstract: | The main features, interannual variability of the eddy pair (an anti-cyclonic southern eddy and a cyclonic northern eddy) off eastern Vietnam and its impact on local thermohaline structure are analyzed using altimeter data, the Simple Ocean Data Assimilation (SODA) data, and the Medium-Range Weather Forecasts (ECWMF) data. The results show that the eddy pair is a seasonal phenomenon usually found in the summer to fall. It can reach downward to about 400 m depth but is strongest at the upper 100 m depth. In addition, the eddy pair displays a remarkable interannual variability with periods of 5.6 and 3.6 years. The local wind stress curl plays an important role in the interannual variability of eddy pair. Moreover, the eddy pair has an obvious impact on the thermohaline structure of the local upper ocean. The eddy pair can lead to stronger temperature variability in the upper 380 m but stronger salinity variability only in the upper 150 m depth. When the eddy pair is strong, the anti-cyclonic eddy deepens the thermocline, while the cyclonic eddy shoals the thermocline. Taking the depth of 20 °C isotherm as the thermocline depth, we find that in September, the thermocline drops downward to 110–140 m depth in the anti-cyclonic eddy but rises up to 50–80 m depth in the cyclonic eddy. |
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Keywords: | Eddy pair Interannual variability Thermohaline structure Off eastern Vietnam |
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