齐彦斌,冉令坤,洪延超. 2009. 云凝结物平流输送对降水云系发展影响的数值模拟研究[J]. 气象学报, 67(6):1045-1057, doi:10.11676/qxxb2009.101
云凝结物平流输送对降水云系发展影响的数值模拟研究
Numerical study of influence of clo ud hydrometeor advections on precipitable cloud system
投稿时间:2008-04-07  修订日期:2008-10-22
DOI:10.11676/qxxb2009.101
中文关键词:  宏观动力过程, 云凝结物, 平流输送, 数值研究
英文关键词:Macroscopically dynamical process, Cloud hydrometeors, Advection transport, Nume rical simulation
基金项目:国家自然科学基金项目(40475006、40775007)、吉林省气象局开放式基 金课题、中国气象局、吉林省人民政府人工影响天气联合开放实验室课题
作者单位
齐彦斌 中国科学院大气物理研究所北京100029中国科学院研究生院北京100049吉林省人工影响天气办公室长春130062 
冉令坤 中国科学院大气物理研究所北京 100029 
洪延超 中国科学院大气物理研究所北京 100029 
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中文摘要:
      大气动力学中“平流输送”是非常重要的宏观动力学过程,云凝结物的平流输送与 降水云系的发展演变密切相关,它把宏观动力过程与各种云凝结物粒子的时空演变联系起来 ,云凝结物的平流输送可以增加或减少局地大气中云凝结物的含量,改变云凝结物的空间分 布状况,影响云凝结物的微观物理过程,进而促进或抑制降水云系的发展演变。本文在数 值模拟研究中,通过改变云凝结物平流输送的状况来研究宏观动力过程对云微观物理过 程的影响,因而利用ARPS模式开展3个分别排除云凝结物水平平流输送、垂直平流输送和三 维平流输送的敏感试验,进行关于云凝结物平流输送对降水云系发展演变影响的敏感性数值 模拟研究。结果表明,云凝结物的平流输送对水汽比湿的影响很小。云凝结物的三维平流输 送有利于增加降水云系中雪和霰的混合比含量,抑制云水、雨水和云冰混合比含量的增长。 云凝结物的水平平流输送可以降低降水云系中云水和雨水的混合比含量,增加云冰和雪的混合比含量;云凝结物垂直平流输送的作用是增加降水云系中雨水、雪和霰的混合比含量,减少云与冰混合比含量。云凝结物三维平流输送效应的分析表明,云凝结物的三维平流输送主要通过调整云凝结物的微物理过程源汇项以及降水粒子(雨水、雪和霰)的下落末速项来改变降水云系中云凝结物的垂直结构;另外,雪的三维平流输送对雪本身的分布也有一定影响。
英文摘要:
      Advection transport effects by wind field is a very important macrosco pically dynamical process for weather systems in real atmosphere. Cloud hydromet eor advections by three dimensional velocity vector are closely related to evol ution of precipitable cloud system and connect the macroscopically dynamical pro cess with the temporal and spatial variations of cloud hydrometeors. The advecti on transport of cloud hydrometeors may increase or decrease the contents of clou d hydrometeors and change their spatial distributions so that the development of precipitable cloud system may be prompted or broken up. The purpose of this pap er is to investigate the influence of macroscopically dynamical process on cloud microphysical process by changing the cloud hydrometeor advection transports in the numeric simulation of a heavy rainfall event occurring in North China duri ng 00:00 UTC 12-00:00 UTC 13 August 2004. Combining the NCEP/NCAR real analysi s data and routine observations of surface level and sounding, the ARPS model is employed to carry out simulations of the heavy rainfall event, including one co ntrolli ng experiment and three numerical experiments in which the horizontal, vertical and total three dimensional advection transports of cloud hydrometeors were exc luded, respectively. The result showed that the simulated specific humidity was little influenced by the cloud hydrometeor advection transports. The three dime nsional advection transports of cloud hydrometeors was propitious to enrich the mixing ratios of snow and graupel, while the contents of cloud water, rain water and ice were held back. The horizontal advection transports of cloud hydrometeo rs contributed to the mixing ratios of ice and snow, and diminished the contents of cloud water and rain water. The vertical advection transports of cloud hydro meteors improved the mixing ratios of rain water, snow and graupel and at the sa me time, worsened the content of ice. The analysis of three dimensional advecti on transport effects showed that the influence of three dimensional advection t ransports of cloud hydrometeors on precipitable cloud system was realized via ad justing the source or sink of cloud hydrometeors produced by cloud microphysical processes and the sedimentation of precipitable hydrometeors (rain water, snow and graupel), and then changing the vertical spatial structures of cloud hydrome teors. In addition, the contribution of the advection transport of snow to itsel f was also important.
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