Seasonal sea surface temperature variability in the Indonesian Seas
Seasonal sea surface temperature variability in the Indonesian Seas
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DOI：
10.1029/2008jc005150
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发表时间：
2009-06-17
影响因子：
3.6
通讯作者：
Richards, K. J.
中科院分区：
文献类型：
--
作者：
Kida, S.;Richards, K. J.
印度尼西亚海洋季风风的响应进行了研究，重点是了解所观察到的季节性海表温度（SST）变率背后的机制，使用区域海洋模式。由于大气深对流直接位于这些海洋上方，因此了解印度尼西亚海的季节性SST变化对于了解热带气候变化至关重要。我们的模式结果表明，季风风起主导作用，在创造空间SST的变化，并负责诱导约一半的流域平均SST的变化。剩下的一半是由辐射和大气温度和湿度引起的表面加热条件引起的。西南夏季的西北风在整个海盆大致均匀，因此风混合大致均匀，没有显著的空间SST变率。而南方冬季的东南风则有明显的空间变化，最大风速出现在盆地中部。这种空间变化导致Ekman上升流和下降流在印度尼西亚海的北部和南部，分别，并建立了一个冷的SST区域在东北部。东部浅海陆架区的存在也是这次冷SST事件形成的关键。在没有陆架的情况下，来自西部的暖水的横向平流将把冷SST区困在东部边界。
The response of the Indonesian Seas to the monsoonal winds is investigated using a regional ocean model with an emphasis on understanding the mechanisms behind the observed seasonal sea surface temperature (SST) variability. Understanding the seasonal SST variability in the Indonesian Seas is crucial for understanding tropical climate variability since atmospheric deep convection is located directly above these seas. Our model results suggest that the monsoonal winds play a dominant role in creating the spatial SST variability and are responsible for inducing about half of the basin-averaged SST variability. The remaining half is found to be caused by conditions in surface heating, which is brought about by radiation and atmospheric temperature and humidity. The northwesterly wind during Austral summer is roughly uniform over the basin so wind mixing occurs roughly uniformly and no significant spatial SST variability is forced. The southeasterly wind during Austral winter, on the other hand, has a significant spatial variation with a maximum wind speed located in the middle of the basin. This spatial variability causes Ekman upwelling and downwelling in the north and south of the Indonesian Seas, respectively, and establishes a cold SST region in the northeast. The presence of the shallow shelf region in the east is also found critical to the formation of this cold SST event. Without the shelf, lateral advection of warm water from the west will trap the cold SST region to the eastern boundary.