陈红专,叶成志. 2020. 中国近30年有/无大气河伴随的登陆台风气候学特征对比分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.058
中国近30年有/无大气河伴随的登陆台风气候学特征对比分析
Comparative analysis of water vapor field characteristics of landing typhoon with or without atmosphere and river in recent 30 years in China
投稿时间:2020-03-09  修订日期:2020-05-09
DOI:10.11676/qxxb2020.058
中文关键词:  大气河,登陆台风,水汽场特征,动态合成
英文关键词:Atmospheric river, landing typhoon, characteristics of water vapor field, dynamic synthesis
基金项目:
作者单位E-mail
陈红专 湖南省怀化市气象局 dktanqx@tom.com 
叶成志 湖南省怀化市气象局 yechengzhi_hunan@hotmail.com 
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中文摘要:
      利用JRA55再分析资料和近30年台风资料,采用动态合成分析方法对1986年~2015年有无大气河伴随的登陆台风大尺度环流和水汽场特征进行了合成分析,以探讨大气河对登陆台风维持和衰减的影响,主要结论如下:30年内登陆我国大陆的台风中,有大气河伴随和无大气河伴随的台风大约各占50%,平均陆上维持时间前者(38 h)长于后者(22.5 h)。有大气河伴随的台风登陆后,台风与副高之间等高线密集,台风在中纬度槽前移动过程中有逐渐向斜压锋区靠近的趋势,而无大气河伴随的台风登陆后,台风与副高之间等高线稀疏,也无长波槽靠近;有大气河伴随的台风登陆后,仍然与西南风低空急流和超低空急流水汽输送通道相连,台风涡施区大风核伸展高度高,而无大气河伴随的台风登陆后与强水汽通道断开;登陆台风是水汽汇的一个高值中心,夏季印度季风环流和南海夏季风是向台风输送水汽的主要通道。有大气河伴随的台风,水汽输送的大小和辐合的强度明显大于无大气河伴随的台风,且其水汽辐合呈准对称结构,而无大气河伴随的台风其水汽辐合呈不对称结构,北侧的偏冷性强水汽输送会加速台风的填塞;有大气河伴随的台风登陆后,其南边界一直维持较强的水汽输送,台风区域总的水汽收入减小缓慢,而无大气河伴随的台风登陆后,台风区域的总的水汽收入迅速减小;从垂直分布来看,有大气河伴随的台风在登陆后48小时内,其低层气旋式环流结构较完整,四个边界均有净的水汽输入,随着高度增加,结构趋于松散。而无大气河伴随的台风在登陆24小时后其气旋式环流结构已不完整。
英文摘要:
      In this paper, the dynamic synthesis analysis method is used to analyze the characteristics of large-scale circulation and water vapor field of landing typhoon with or without atmospheric rivers (AR) from 1986 to 2015 based on JRA55 reanalysis product and typhoon data. The main conclusions are as follows: Of the typhoons that landed on the mainland of China within 30 years, the number of the typhoon with AR and without AR is roughly equal, and the average duration of former (38 h) is longer than the latter (22.5 h). After the typhoon with AR landed, the contour lines between the typhoon and the subtropical high were dense, and the typhoon tended to approach the baroclinic front zone gradually as it moved in front of the mid-latitude trough; as for the typhoon without AR, the contour lines between the typhoon and the subtropical high are sparse, and there is no long wave trough approaching; After the typhoon with AR landed, it was still connected with the southwesterly Low-Level Jet (LLJ) and the Ultra-Low-Level Jet rapid water vapor transport channel. the strong wind core of the typhoon vortex wet area extended highly, while the typhoon without AR were disconnected from the strong water vapor channel after landing; Landing typhoon is a high-value center of water vapor sink. The Indian monsoon circulation in summer and the South China Sea summer monsoon are the main channels for transporting water vapor to the typhoon. As the typhoon with AR, the magnitude of water vapor transport and the intensity of the convergence were significantly larger than those of the typhoon without AR, and the water vapor convergence had a quasi-symmetric structure. While the typhoon without AR had asymmetric structure, thus the colder and stronger water vapor transport on the north side would accelerate the filling of typhoon; After the typhoon with AR has landed, its southern boundary has always maintained a strong water vapor transport, and the total water vapor income in the typhoon region has slowly decreased. As for the typhoon without AR, the total water vapor income in the typhoon region has decreased rapidly; From the perspective of vertical distribution, within 48 hours after landing, the typhoon with AR has a relatively complete low-level cyclonic circulation structure, and there was net water vapor input in the four boundaries. As the height increased, the structure tended to become loose. The cyclonic circulation structure of the typhoon without AR was incomplete after 24 hours of landing.
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