Seasonal and Interannual Variations of the SST above the Seychelles Dome
Seasonal and Interannual Variations of the SST above the Seychelles Dome
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DOI：
10.1175/jcli-d-10-05001.1
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发表时间：
2012-01
影响因子：
4.9
通讯作者：
Takaaki Yokoi;T. Tozuka;T. Yamagata
中科院分区：
文献类型：
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作者：
Takaaki Yokoi;T. Tozuka;T. Yamagata
摘要利用OGCM观测资料，研究了塞舌尔冰穹（SD）上空海表温度（SST）的季节和年际变化。SST从8月到4月变暖，5月到7月变冷。地表热通量在季节变化中起着最重要的作用，主要是由短波辐射引起的。水平平流使南半球冬季的海温偏暖，这是由于与印度夏季风有关的向南的Ekman热输送。在南半球夏季，由于混合层较薄，垂直湍流扩散的冷却作用最有效。在年际时间尺度上，当海温场弱（强）时，海温异常暖（冷）。与季节变化相反，垂直扩散起着最重要的作用，并导致异常变暖（冷却）。这种变暖（变冷）是由于混合层下面的异常温暖（寒冷）的水，这是由于更深（更浅）的温跃层的响应。
AbstractThe seasonal and interannual variations of the sea surface temperature (SST) above the Seychelles Dome (SD) are investigated using outputs from an OGCM. The SST warms from August to April and cools from May to July. The surface heat flux plays the most important role in the seasonal variation, and it is mostly due to shortwave radiation. The horizontal advection tends to warm the SST in austral winter owing to the southward Ekman heat transport associated with the Indian summer monsoon. The cooling by the vertical turbulent diffusion becomes most effective in austral summer owing to the thin mixed layer during that time. On the interannual time scale, the SST becomes anomalously warm (cool) when the SD is weak (strong). In contrast to the seasonal variation, the vertical diffusion plays the most important role and causes anomalous warming (cooling). This warming (cooling) is due to the anomalously warm (cold) water below the mixed layer as a result of the deeper (shallower) thermocline in response...