doi:  10.3878/j.issn.1006-9895.1804.17291
不同微物理方案对台风“彩虹”(2015)降水影响的比较性研究

Comparative study on the effects of different microphysics schemes on precipitation in typhoon “”Mujigae“”
摘要点击 1025  全文点击 175  投稿时间:2017-11-29  修订日期:2018-03-21
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基金:  国家重点基础研究发展计划(2013CB430105),国家自然科学(41675059, 41375066 , 41530427).Supported by: the National Basic Research Program of China(2013CB430105), the National Natural Science Foundation of China (41675059, 41375066 and 41530427).
中文关键词:  台风降水,云微物理过程,数值模拟,“彩虹”台风
英文关键词:  Typhoon  rainfall, cloud  microphysical process, numerical  simulation, Mujigae
           
作者中文名作者英文名单位
庞琦烨PANG Qiye南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心
平凡PING Fan中国科学院大气物理研究所
沈新勇SHEN Xinyong南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心;中国科学院大气物理研究所云降水物理与强风暴重点实验室LACS
刘靓珂liu jiangke南京信息工程大學
引用:庞琦烨,平凡,沈新勇,刘靓珂.2018.不同微物理方案对台风“彩虹”(2015)降水影响的比较性研究[J].大气科学
Citation:PANG Qiye,PING Fan,SHEN Xinyong,liu jiangke.2018.Comparative study on the effects of different microphysics schemes on precipitation in typhoon “”Mujigae“”[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      采用GFS资料作为初始场,运用中尺度数值模式v3.6.1针对2015年秋台风“彩虹”进行数值模拟。利用CMA台风最佳路径资料、MTSAT卫星、自动站降水资料,对比了4个微物理方案(Lin、WSM6、Gce和Morrison)对“彩虹”路径、强度、结构台风降水分布以及水成物的模拟效果。研究发现所选的云微物理方案都较好地模拟出了“彩虹”西行登陆过程,而台风强度、结构及降水对云微物理参数化方案的选择比路径更敏感;就水成物而言,除Gce方案对雨水的模拟偏高以外,各方案对暖雨过程模拟近似,差异主要存在于对云冰、雪、霰粒子的模拟上;从云微物理角度出发,分析了WSM6和Morrison两个方案模拟的不同是WSM6方案下雪和霰粒子融化过程要强于Morrison方案,但冰相粒子之间的相互转化过程的强度要弱于Morrison方案;此外WSM6方案下眼区附近潜热释放更强,暖心结构更为显著,模拟出的台风中心气压更低。此次台风降水过程的主要云微物理过程首先是水汽凝结成云水或凝华为云冰,生成的云水一方面被雨水碰收集直接转化为雨水,另一方面先被雪粒子碰并收集转化为霰, 随着霰粒子下沉到融化层生成雨水;生成的云冰则通过碰并增长转化为雪,一部分雪粒子碰并收集过冷水滴并淞附增长为霰粒子,然后霰粒子被下沉气流带到低层融化转化为雨水,另有相当一部分雪粒子直接融化形成地面降水。
Abstract:
      Using GFS data as the initial field, numerical simulation of typhoon "Mujigae" in 2015 was conducted using the WRF3.6.1 (mesoscale weather research and forecasting model). Comparative study of the four microphysical schemes (Lin, WSM6, Gce and Morrison) ,which concerns the typhoon track, intensity, precipitation and contents of hydrometeors was carried out using best-track dataset from CMA, MTSAT satellite data and automatic station precipitation data. The study found that four cloud microphysical schemes have both simulated the westward moving process of typhoon landing, while the intensity, structure and precipitation of typhoon are more sensitive to the choice of cloud microphysics parameterization; In terms of the water content, except the overestimated precipitation in Gce scheme, the other three schemes has the similar simulation in warm rain process, which means the differences mainly exists in the simulation of cloud ice, snow and graupel particles. Comparing the simulation of cloud physical transformation process in WSM6 and Morrison scheme, it is found the melting snow and graupel particles in WSM6 scheme is superior to the Morrison, but the strength of the conversion process between ice phase particles is weaker than Morrison. Besides, the strong diabatic heating is more focus to the eye area in WSM6 scheme, resulting in lower central pressure. The main cloud microphysics process of the typhoon precipitation process is as follows. Firstly, the water vapor condenses into cloud water or sublimated to cloud ice. Some generated cloud water is then collected directly into rainwater by the rainwater collection, and the other part is accreted by snow particles and collected into graupel, which finally generate rainwater as the graupel particles sink to the melting layer. Through accretion the cloud ice is generated into snow, part of snow particles collect super-cooled water droplets and rimming into graupel, the graupel particles are then sink to lower with the airflow and melt into rain, a considerable part of snow particles directly melt to form the precipitation.
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