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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Seasonal heat budget in the mixed layer of the southeastern tropical Indian Ocean in a high-resolution ocean general circulation model
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Seasonal heat budget in the mixed layer of the southeastern tropical Indian Ocean in a high-resolution ocean general circulation model

机译：东南热带印度洋混合层的季节性热预算在高分辨率海洋通用循环模型中

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摘要

Using results from a high-resolution ocean general circulation model, this study identifies the impact of ocean dynamics on the mean seasonal cycle of sea surface temperature (SST) in the southeastern tropical Indian Ocean. An important question about the mechanisms of regional SST variation arises in a quick look at satellite-observed SST and ocean color. Although ocean color indicates a distinctive upwelling season from July to September, the SST depression off Java and Sumatra is small, forming a sharp contrast with other eastern boundary regions. The model results suggest an explanation of the process responsible for the small SST depression. Our analysis indicates that there are three dynamically different regimes within the region. First, near the coast of northwest Australia, surface heat flux controls the seasonal variation of SST, while horizontal advection and vertical entrainment are relatively weak. This result is consistent with previous studies. Second, south of Java and farther to the east, warm horizontal advection of the Indonesian throughflow (ITF) neutralizes the cold upwelling. The transport of the ITF, especially the outflow from the Lombok Strait, reaches its seasonal maximum in July–September, at the same time that the maximum upwelling occurs. Third, west of Sumatra, a thick barrier layer exists, which impedes the cold thermocline water from entering the mixed layer (ML). Although upwelling occurs, it has no significant effect on the SST as a result of the small vertical temperature gradient at the bottom of the ML.
机译：本研究采用高分辨率海洋通用循环模型的结果标识了海洋动力学对东南热带印度洋海面温度（SST）的平均季节性循环的影响。关于区域SST变异机制的一个重要问题出现在快速看卫星观察到的SST和海洋颜色。虽然海洋颜色表明7月至9月的独特上升季，但爪哇和苏门答腊的SST凹陷很小，与其他东部边界地区形成鲜明对比。模型结果表明对负责小SST抑郁症负责的过程的解释。我们的分析表明该地区内部有三个动态不同的制度。首先，靠近西北澳大利亚海岸，表面热通量控制SST的季节变化，而横向平流和垂直夹带相对较弱。该结果与先前的研究一致。其次，Java南部和东部进入东部，温暖横向平流印度尼西亚流行（ITF）中和冷藏。 ITF的运输，特别是龙目岛海峡的流出，于9月至9月达到了季节性最大，同时发生最大的升值。第三，苏门答腊西部，存在厚屏障层，其将冷热管水从进入混合层（m1）。虽然发生升值，但由于ML底部的垂直温度梯度小，因此对SST没有显着影响。

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