A subsurface thermohaline front semi-permanently formed in association with near-bottom cyclonic circulation in the northern East China Sea was newly found from detailed hydrographic data collected during two cruises in February 2017 (winter) and April 2018 (spring) along with supplementary satellite remote sensing and historical hydrographic data. An alternate intruding frontal structure in water properties was observed across the cyclonic circulation in both seasons as formed by two contrasting water masses-low-temperature and low-salinity (i.e., low spiciness) water transported by the East China Sea Current and high-temperature and high-salinity (i.e., high spiciness) water transported by the Tsushima Warm Current. Consistent structures were confirmed from current observations during the two cruises, historical hydrographic observations, and satellite altimetry-derived sea surface height and surface frontal structure, indicative of retroflection of the Cheju Warm Current as deemed by the seasonal development of thermal stratification in spring. Our results reveal significant heat and material exchanges between the open Pacific and the broad shelf, particularly via diapycnal mixing and cross-front transports associated with across-front flow and cyclonic circulation, in the northern East China Sea.

译文

:在2017年2月(冬季)和2018年4月(春季)的两次航行中收集的详细水文数据中,新发现了与东海北部近底气旋循环半永久结合形成的地下热盐线前体。遥感和历史水文数据。在两个季节的整个气旋循环中,观察到了交替的侵入性锋面结构,这是由东海洋流和高温输送的两个相反的水团形成的,即低温和低盐度(即低辣度)水形成的。以及对马暖流输送的高盐度(即高辣度)水。两次航行中的当前观测,历史水文观测以及卫星测高仪得出的海面高度和表面锋面结构都证实了一致的结构,这表明了春季热分层的季节性发展表明了济州暖流的逆转。我们的研究结果揭示了东太平洋北部太平洋与大陆架之间存在大量的热和物质交换,特别是通过二叠氮混合和跨前沿流动和旋风循环相关的跨前沿运输。

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