Atmospheric response to interannual variability of sea surface temperature front in the East China Sea in early summer
Atmospheric response to interannual variability of sea surface temperature front in the East China Sea in early summer
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DOI：
10.1007/s00382-017-4025-y
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发表时间：
2018-10
期刊：
影响因子：
4.6
通讯作者：
Y. Sasaki;Yuko Yamada
中科院分区：
文献类型：
--
作者：
Y. Sasaki;Yuko Yamada
利用1982 - 2010年的再分析资料、卫星资料和雨量计资料，分析了初夏东海黑潮锋面海温年际变化对大气尤其是梅雨-白浪雨带的响应。结果表明，东海强（弱）SST锋与东海中部和日本南部强（弱）降水相伴。由于强海温锋主要是由陆架海温负距平引起的，东海局地蒸发量的变化并没有被这种增强的降水所平衡。东海中部水平风辐合的年际变化为降水的增强提供了水汽。除了降水的变化外，强SST锋还伴随着东海上空对流层低层天气扰动的加强。这可能是由于大陆架海温负距平增强了对流层低层的斜压性。东海上空天气扰动的增强可以解释东海中部降水对海温锋年际变化的响应。由于大陆架上的SST异常主要决定了SST锋的年际变化，它持续了几个月，这些结果意味着与梅雨-白浪雨带有关的降水的可预报性。
The atmospheric response, especially the response of the meiyu-baiu rainband, to interannual variability of the sea surface temperature (SST) front associated with the Kuroshio in the East China Sea in early summer is examined by using reanalysis, satellite, and rain-gauge datasets from 1982 to 2010. It is revealed that the strong (weak) SST front in the East China Sea is accompanied by the heavy (weak) precipitation over the central East China Sea and the southern Japan. Because the strong SST front largely results from the negative SST anomaly over the continental shelf, the local evaporation change in the East China Sea is not balanced by this enhanced precipitation. The moisture for this enhanced precipitation is supplied by interannual variability of horizontal wind convergence over the central East China Sea. In addition to the precipitation change, the strong SST front is also accompanied by the intensification of weather disturbances in the lower troposphere over the East China Sea. This is probably because the negative SST anomaly over the continental shelf enhances the baroclinicity in the lower troposphere. This intensification of the weather disturbances over the East China Sea can explain the enhanced precipitation over the central East China Sea in response to the interannual variability of the SST front. Because the SST anomaly over the continental shelf, which primarily determines the interannual variability of the SST front, persists for a couple of months, these results imply the predictability of the precipitation associated with the meiyu-baiu rainband.