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首页> 外文期刊>Journal of oceanography >Long-term variability of winter mixed layer depth and temperature along the Kuroshio jet in a high-resolution ocean general circulation model
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Long-term variability of winter mixed layer depth and temperature along the Kuroshio jet in a high-resolution ocean general circulation model

机译：高分辨率海洋总环流模型中冬季混合层深度和温度沿黑潮的长期变化

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摘要

To explore the causes of the winter shallow mixed layer and high sea surface temperature (SST) along the strong Kuroshio jet from the East China Sea to the upstream Kuroshio extension (25.5°N–150°E) during 1988–1994 when the Japanese sardine stocks collapsed, high-resolution ocean general circulation model (OGCM) hindcast data are analyzed with a bulk mixed layer model which traces particles at the mixed layer base. The shallow mixed layer and high SST along the Kuroshio jet are mainly caused by the acceleration of the Kuroshio current velocity and the reduction of the surface cooling. Because the acceleration reduces the time during which the mixed layer is exposed to wintertime cooling, deepening and cooling of the winter mixed layer are restricted. The weaker surface cooling due to less severe meteorological forcing also causes the shallow mixed layer and the high SST. The impact of the strong heat transport along the Kuroshio extends to the southern recirculation gyre of the Kuroshio/Kuroshio extension regions; previous indications that the Japanese sardine recruitment is correlated with the winter SST and the mixed layer depth (MLD) in the Kuroshio extension recirculation region could be related to the velocity, SST, and MLD near the Kuroshio axis which also could affect the variability of North Pacific subtropical water.
机译：研究1988-1994年日本沙丁鱼期间从东海到黑潮延伸段（25.5°N–150°E）沿黑潮强烈的喷流造成冬季浅层混合层和海表温度高（SST）的原因种群崩溃后，使用大体积混合层模型分析高分辨率海洋总环流模型（OGCM）的后预报数据，该模型在混合层底部追踪颗粒。沿黑潮射流的浅层混合层和较高的海温，主要是由于黑潮流速度的加快和表面冷却的减少所致。因为加速度减少了混合层暴露于冬季冷却的时间，所以冬季混合层的加深和冷却受到限制。由于不太强的气象强迫而导致的表面冷却较弱，也会导致混合层浅和海温升高。沿黑潮强烈的热传输的影响扩展到了黑潮/黑潮延伸区的南部回流环流。先前的迹象表明，日本沙丁鱼的募集与冬季的海面温度相关，而黑潮延伸回流区的混合层深度（MLD）可能与黑潮轴附近的速度，海面温度和MLD有关，这也可能影响北半球的变异性。太平洋亚热带水。

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