A striking early-summer event of a convective rainband persistent along the warm Kuroshio in the East China Sea
A striking early-summer event of a convective rainband persistent along the warm Kuroshio in the East China Sea
复制标题
DOI：
10.3402/tellusa.v64i0.18962
复制
发表时间：
2012-01-01
影响因子：
2
通讯作者：
Kuwano-Yoshida, Akira
中科院分区：
文献类型：
--
作者：
Miyama, Toru;Nonaka, Masami;Kuwano-Yoshida, Akira
2010年5月19日至20日，一条狭窄而清晰的雨带一直笼罩在东中国海面上，与其以北的白云/梅雨锋完全分开。雨带是沿着黑潮形成的，这让我们认为，黑潮的高海面温度(SST)有助于在温暖、潮湿的南面地区组织和维持对流降水。这一假设通过区域大气模式的两个实验得到了验证。用高分辨率海温作为下界条件的实验成功地再现了观测到的雨带。然而，在另一个实验中，这种复制是不成功的，在该实验中，通过平滑处理，人为地消除了黑潮沿岸的SST极大值窄带。这些实验表明，黑潮沿岸的高海温对于形成与白云/梅雨锋分离的对流雨带具有重要作用，从而提供了中纬度西边界流影响上覆大气的证据。其他实验表明，台湾的地形也可以通过加强温暖的黑潮上空表面偏南风的辐合，对雨带的组织起到积极的作用。
A narrow, well-defined rainband persisted over the East China Sea on 19-20 May 2010, well separated from the Baiu/Meiyu front to its north. The rainband formed along the Kuroshio, leading us to the hypothesis that its high sea-surface temperature (SST) helped organise and maintain convective precipitation within the warm, moist surface southerlies. This hypothesis is verified through a pair of experiments with a regional atmospheric model. An experiment where high-resolution SST is prescribed as the lower-boundary condition is successful in reproducing the observed rainband. The reproduction is, however, unsuccessful in the other experiment where the narrow band of SST maxima along the Kuroshio has been artificially eliminated by smoothing. These experiments demonstrate that the high SST along the Kuroshio was of critical importance in organising the convective rainband separated from the Baiu/Meiyu front, thus presenting evidence that a mid-latitude western boundary current can influence the overlying atmosphere. Additional experiments suggest that the orography of Taiwan can also contribute positively to the organisation of the rainband by enhancing the convergence of the surface southerlies over the warm Kuroshio.