中国物理B ›› 2010, Vol. 19 ›› Issue (10): 109201-109201.doi: 10.1088/1674-1056/19/10/109201

• • 上一篇    

Spectral dispersion of cloud droplet size distributions and radar threshold reflectivity for drizzle

刘晓东1, 解小宁2   

  1. (1)State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong U; (2)State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2009-11-18 修回日期:2010-05-24 出版日期:2010-10-15 发布日期:2010-10-15
  • 基金资助:
    Project supported by the Special Foundation for China Nonprofit Industry (Grant No. GYHY200706036), the National Excellent Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 40825008), and the National Basic Research Program of China (Grant No. 2010CB833406).

Spectral dispersion of cloud droplet size distributions and radar threshold reflectivity for drizzle

Xie Xiao-Ning(解小宁)a)b)^†ger and Liu Xiao-Dong(刘晓东)a)c)   

  1. a State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; b Graduate University of the Chinese Academy of Sciences, Beijing 100049, China; c  Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2009-11-18 Revised:2010-05-24 Online:2010-10-15 Published:2010-10-15
  • Supported by:
    Project supported by the Special Foundation for China Nonprofit Industry (Grant No. GYHY200706036), the National Excellent Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 40825008), and the National Basic Research Program of China (Grant No. 2010CB833406).

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摘要： From first principles, we find that the radar threshold reflectivity between nonprecipitating clouds and precipitating clouds is strongly related to not only the cloud droplet number concentration but also the spectral dispersion of cloud droplet size distributions. The further investigation indicates that the threshold value is an increasing function of spectral dispersion and cloud droplet number concentration. These results may improve our understanding of the cloud-precipitation interaction and the aerosol indirect effect.

Abstract: From first principles, we find that the radar threshold reflectivity between nonprecipitating clouds and precipitating clouds is strongly related to not only the cloud droplet number concentration but also the spectral dispersion of cloud droplet size distributions. The further investigation indicates that the threshold value is an increasing function of spectral dispersion and cloud droplet number concentration. These results may improve our understanding of the cloud-precipitation interaction and the aerosol indirect effect.

Key words: radar threshold reflectivity, spectral dispersion, cloud droplet number concentration

中图分类号:  (Water in the atmosphere)

  • 92.60.Jq
92.60.Mt (Particles and aerosols) 92.60.Nv (Cloud physics and chemistry)