李娟,毛节泰,胡志晋,游来光,张蔷. 2004. 冰核浓度变化对云辐射的模拟试验[J]. 气象学报, 62(1):77-86, doi:10.11676/qxxb2004.009
冰核浓度变化对云辐射的模拟试验
NUMERICAL SIMULATION EXPERIMENTS FOR THE EFFECTS OF CHANGES OF ATMOSPHERIC ICE NUCLEI CONCENTRATIONS ON RADIANT PROPERTIES OF CLOUD
投稿时间:2003-08-10  修订日期:2003-09-10
DOI:10.11676/qxxb2004.009
中文关键词:  冰核  观测  数值模拟  气候  辐射
英文关键词:Ice nuclei  Observatton  Numerical simulation  Climate  Radiation
基金项目:国家科技攻关计划项目“卫星资料在人工影响天气作业中的应用”
作者单位
李娟 北京大学物理学院大气科学系, 北京, 100871 
毛节泰 北京大学物理学院大气科学系, 北京, 100871 
胡志晋 中国气象科学研究院人工影响天气研究所, 北京, 100081 
游来光 中国气象科学研究院人工影响天气研究所, 北京, 100081 
张蔷 北京市气象局人工影响天气办公室, 北京, 100089 
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中文摘要:
      文中利用中国气象科学研究院2000年版三维对流云模式,假设冰核浓度比现在模式中通常用来计算实际降水量的Fletcher给出的冰核浓度增大了5倍,对北京地区1996年6~9月18次降水过程作了模拟的对比分析。结果发现,80%的模拟云在冰核浓度增大后都出现降水减小,云顶卷云毡面积扩大,云顶升高;95%的模拟云出现冰晶尺度变小,数量增多的现象。说明冰核浓度增大后,云的物理特性会有一些改变,并可能通过直接和间接作用改变辐射过程从而产生一定的气候效应。
英文摘要:
      Research on the possible effects of Cloud Condensation Nuclei(CNN) on radiant properties of cloud and climate has been investigated in many papers,but the effects of Ice Nuclei(IN)have not been well analyzed.In fact,ice nuclei are very importantin many weather events for the reason that IN can affect the initial concentrations of ice particles in cold cloud and then change the physical characteristics of cold cloud.Recently,with more and more human activities,numerical concentrations of IN have increased a lot in at mosphere in some places. Observations in Beijing show that the concentrations of IN in Beijing have increased a lotin about 32 years from 1963 to 1995.The IN concentrations which can been activated at -20℃ increase about 15 times.Since,ice nuclei concentrations athigh altitudes and the concentrations and scales of ice crystal in cloud can not be observed sy nchronous easily now,so the relation between concentrations of IN and ice crystal by observation we can not be tested in reality.Thus,numerical simulations are adopted.In this thesis,all simulations used 3-D convective cloud model of CAMS(Chinese Academy of Meteorological Sciences,version 2000).First of all,a single test which used the sounding data of June,10,1996 was completed.In the simulation,it is supposed that the concentration of IN had increased 5 times and 10 times and got the same results that ice particles concentration increased and the size of them decreased.What is more,cloud tops heightened when IN concentrations increased although the change ranges were notentirely the same.Then numerical simulations of 18 precipitation days from June to September in 1996 were conducted.The conclusions were that when ice nuclei concentrations increased, in 80 percents simulated precipitation processes,the amounts of precipitation decreased,the cloud tops heigh-tened and the areas of cloud top height increased.rather more,in 95 percents processes,the scales of ice crystal in the cloud decreased and the quantities increased.That is,physical properties of cold cloud changed when IN concentrations changed.From some analysis including a simulation using SBDART radiative model,some results could be achieved.That is,cloud reflectance increased when cloud top increased,ice particles concentration increased and size of them decreased when cloud reflectance increased.In conclusion,radiant properties of cloud changed when IN concentrations increased.For the reason that cold cloud plays an importantrole in global radiative balance,the climatic effects caused by cold cloud can be modified directly and indirectly.
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