本文主要研究内容
作者冯锡斌（2019）在《登陆我国热带气旋降水分布的演变及其环境场影响的机理分析》一文中研究指出：热带气旋(tropical cyclone,下文简称为TC)是复杂激烈的天气系统之一,其带来的大风和强降水等,常给登陆地区带来严重的气象灾害。西北太平洋是全球TC活动最为活跃的海域,我国是世界上受台风侵袭最严重的国家之一。因此,本文以登陆我国TC为研究对象,利用十年(2005-2014)热带降水测量任务卫星(Tropical Rainfall Measuring Mission,TRMM)资料,探究登陆我国TC降水的时空分布演变特征及其垂直结构的变化,并着重从天气尺度环境影响的角度出发,分析在中层干环境场或者TC本身强度较弱的情况下,TC仍能产生强降水的机理,以及环境场在此过程中的重要作用。基于TRMM资料的观测分析表明,TC外核区的降水受环境场的影响最为显著,尤其是强度较弱的TC。登陆后虽然TC的强度在减弱,但是弱TC的降水强度与强TC降水强度相近,并未有明显的减弱趋势。在天气尺度环境场的配置作用下,TC外核区对流强度随登陆有增强趋势,甚至发展出深对流,并拥有最大的对流降水面积比例及对流降水贡献比例。结合天气学的机理分析表明,TC登陆我国时,受副热带高压干暖气流及大陆上空干空气的影响,TC环流将与环境场发生相互作用,干空气会被逐渐卷入并切断TC南侧的中层水汽供应,使得TC登陆时的降水面积减小。干空气主要影响TC外核区的降水分布,而内核区(眼墙区与主雨带)仍能产生强降水。当多天气系统呈现出“两高夹一低”的配置时,环境干空气的影响最为显著。一方面TC将更大程度处于被干空气包围的干环境中,另一方面,TC将受到逐渐增强、并指向东南方向的环境场垂直风切变(vertical wind shear,下文简称VWS)的影响。随着VWS的增强,TC移动产生的边界层摩擦辐合上升被增强的VWS上风切方向的下沉异常抵消,使得强降水呈非对称分布且主要聚集在VWS的下风切方向。TC登陆后的降水,还会受到热力作用的影响。在有利的环境场配置作用下,登陆弱TC虽然降水面积较小,但仍能产生强降水。研究表明,这类TC常登陆我国广东海南沿岸,并处于这样的环境场中:副热带高压较强,呈稳定的块状分布;南亚高压中心偏北,使得TC中心位于南亚高压南侧高空东风急流入口区的右侧。通过高层强辐散及其抽吸作用,中高层垂直上升运动增强,对流发展旺盛,最终使得弱TC产生强降水。同时,高层强东风急流的存在增大了TC环境场的VWS。一方面,使得TC在垂直方向上向下风切方向倾斜,另一方面,VWS激发的次级环流上升运动得到进一步增强,使强降水最终聚集在下风切方向的有限区域内。
Abstract
re dai qi xuan (tropical cyclone,xia wen jian chen wei TC)shi fu za ji lie de tian qi ji tong zhi yi ,ji dai lai de da feng he jiang jiang shui deng ,chang gei deng liu de ou dai lai yan chong de qi xiang zai hai 。xi bei tai ping xiang shi quan qiu TChuo dong zui wei huo yue de hai yu ,wo guo shi shi jie shang shou tai feng qin xi zui yan chong de guo jia zhi yi 。yin ci ,ben wen yi deng liu wo guo TCwei yan jiu dui xiang ,li yong shi nian (2005-2014)re dai jiang shui ce liang ren wu wei xing (Tropical Rainfall Measuring Mission,TRMM)zi liao ,tan jiu deng liu wo guo TCjiang shui de shi kong fen bu yan bian te zheng ji ji chui zhi jie gou de bian hua ,bing zhao chong cong tian qi che du huan jing ying xiang de jiao du chu fa ,fen xi zai zhong ceng gan huan jing chang huo zhe TCben shen jiang du jiao ruo de qing kuang xia ,TCreng neng chan sheng jiang jiang shui de ji li ,yi ji huan jing chang zai ci guo cheng zhong de chong yao zuo yong 。ji yu TRMMzi liao de guan ce fen xi biao ming ,TCwai he ou de jiang shui shou huan jing chang de ying xiang zui wei xian zhe ,you ji shi jiang du jiao ruo de TC。deng liu hou sui ran TCde jiang du zai jian ruo ,dan shi ruo TCde jiang shui jiang du yu jiang TCjiang shui jiang du xiang jin ,bing wei you ming xian de jian ruo qu shi 。zai tian qi che du huan jing chang de pei zhi zuo yong xia ,TCwai he ou dui liu jiang du sui deng liu you zeng jiang qu shi ,shen zhi fa zhan chu shen dui liu ,bing yong you zui da de dui liu jiang shui mian ji bi li ji dui liu jiang shui gong suo bi li 。jie ge tian qi xue de ji li fen xi biao ming ,TCdeng liu wo guo shi ,shou fu re dai gao ya gan nuan qi liu ji da liu shang kong gan kong qi de ying xiang ,TChuan liu jiang yu huan jing chang fa sheng xiang hu zuo yong ,gan kong qi hui bei zhu jian juan ru bing qie duan TCna ce de zhong ceng shui qi gong ying ,shi de TCdeng liu shi de jiang shui mian ji jian xiao 。gan kong qi zhu yao ying xiang TCwai he ou de jiang shui fen bu ,er nei he ou (yan qiang ou yu zhu yu dai )reng neng chan sheng jiang jiang shui 。dang duo tian qi ji tong cheng xian chu “liang gao ga yi di ”de pei zhi shi ,huan jing gan kong qi de ying xiang zui wei xian zhe 。yi fang mian TCjiang geng da cheng du chu yu bei gan kong qi bao wei de gan huan jing zhong ,ling yi fang mian ,TCjiang shou dao zhu jian zeng jiang 、bing zhi xiang dong na fang xiang de huan jing chang chui zhi feng qie bian (vertical wind shear,xia wen jian chen VWS)de ying xiang 。sui zhao VWSde zeng jiang ,TCyi dong chan sheng de bian jie ceng ma ca fu ge shang sheng bei zeng jiang de VWSshang feng qie fang xiang de xia chen yi chang di xiao ,shi de jiang jiang shui cheng fei dui chen fen bu ju zhu yao ju ji zai VWSde xia feng qie fang xiang 。TCdeng liu hou de jiang shui ,hai hui shou dao re li zuo yong de ying xiang 。zai you li de huan jing chang pei zhi zuo yong xia ,deng liu ruo TCsui ran jiang shui mian ji jiao xiao ,dan reng neng chan sheng jiang jiang shui 。yan jiu biao ming ,zhe lei TCchang deng liu wo guo an dong hai na yan an ,bing chu yu zhe yang de huan jing chang zhong :fu re dai gao ya jiao jiang ,cheng wen ding de kuai zhuang fen bu ;na ya gao ya zhong xin pian bei ,shi de TCzhong xin wei yu na ya gao ya na ce gao kong dong feng ji liu ru kou ou de you ce 。tong guo gao ceng jiang fu san ji ji chou xi zuo yong ,zhong gao ceng chui zhi shang sheng yun dong zeng jiang ,dui liu fa zhan wang cheng ,zui zhong shi de ruo TCchan sheng jiang jiang shui 。tong shi ,gao ceng jiang dong feng ji liu de cun zai zeng da le TChuan jing chang de VWS。yi fang mian ,shi de TCzai chui zhi fang xiang shang xiang xia feng qie fang xiang qing xie ,ling yi fang mian ,VWSji fa de ci ji huan liu shang sheng yun dong de dao jin yi bu zeng jiang ,shi jiang jiang shui zui zhong ju ji zai xia feng qie fang xiang de you xian ou yu nei 。
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论文作者分别是来自南京大学的冯锡斌，发表于刊物南京大学2019-07-02论文，是一篇关于登陆热带气旋论文,降水分布论文,环境场论文,干空气论文,南京大学2019-07-02论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自南京大学2019-07-02论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：登陆热带气旋论文; 降水分布论文; 环境场论文; 干空气论文; 南京大学2019-07-02论文;