Evidence for the significant role of sea surface temperature distributions over remote tropical oceans in tropical cyclone intensity
Evidence for the significant role of sea surface temperature distributions over remote tropical oceans in tropical cyclone intensity
复制标题
偏远热带海洋海面温度分布对热带气旋强度的重要作用的证据
DOI：
10.1007/s00382-015-2859-8
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发表时间：
2016
期刊：
影响因子：
4.6
通讯作者：
and T. Kawano
中科院分区：
文献类型：
--
作者：
Hegde;A. K.;R. Kawamura;and T. Kawano
通过一个区域尺度模式的数值试验，研究了远洋海温(SST)对热带气旋(TC)特征的调节作用。在我们的个例研究中，在印度洋和南中国海的各种海温条件下，进行了模式模拟来模拟台风曼怡(2007年7月)。在对该地区冷暖海温的敏感性模拟中，气旋的强度和路径在其峰值阶段之后发生了系统的变化。温暖的海洋可以大大减少北太平洋西部气旋的加强，而寒冷的海洋可以增强其强度。这与对流层低层水汽输送带从印度洋和南中国海进入气旋中心附近的水汽输送带的水汽供应增强/减弱密切相关。当南中国海温偏暖时，海温偏暖时，大尺度水汽输送进入气旋系统的水汽输送明显减少，导致气旋强度减弱，路径东移。这项研究表明，热带远洋海温的变化也可以调制热带气旋，从而有助于改进热带气旋强度和路径的预报。
The role of remote ocean sea surface temperature (SST) in regulating tropical cyclone (TC) characteristics has been examined by performing numerical experiments with a regional scale model. Model simulations have been carried out to simulate typhoon Man-yi (July 2007), in our case study, under a range of SST conditions over the Indian Ocean and the South China Sea. The intensity and track of the cyclone have been systematically changed in sensitivity simulations of cool and warm SSTs over that region, following its peak phase. Warm oceans can substantially reduce the intensification of western North Pacific cyclones, whereas cool oceans can enhance their strength. This is intimately associated with the enhancement/weakening of the moisture supply through the moisture conveyor belt (MCB) in the lower troposphere, from the Indian Ocean and South China Sea into the vicinity of the cyclone center. When the MCB is interrupted over the South China Sea in warm SST occurrences, the large-scale transport of moisture into the cyclone system is significantly reduced, leading to the weakening of the cyclone intensity and to the eastward shift of its track. This study shows that changes in remote tropical ocean SST can also modulate TCs and thus can help in improving the forecasting of TC intensities and tracks.