globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.atmosres.2017.09.013
Scopus记录号: 2-s2.0-85032463298
论文题名:
Observational study of the relationship between entrainment rate and relative dispersion in deep convective clouds
作者: Guo X.; Lu C.; Zhao T.; Liu Y.; Zhang G.J.; Luo S.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 199
起始页码: 186
结束页码: 192
语种: 英语
Scopus关键词: Atmospheric thermodynamics ; Clouds ; Dispersions ; Drops ; Mixing ; Conceptual model ; Deep convective clouds ; Droplet concentration ; Entrainment rates ; Number concentration ; Observational study ; Relative dispersion ; Standard deviation ; Drop formation ; cloud droplet ; concentration (composition) ; convective cloud ; entrainment ; evaporation ; observational method ; size distribution
英文摘要: This study investigates the influence of entrainment rate (λ) on relative dispersion (ε) of cloud droplet size distributions (CDSD) in the 99 growing precipitating deep convective clouds during TOGA-COARE. The results show that entrainment suppresses ε, which is opposite to the traditional understanding that entrainment-mixing broadens CDSD. To examine how the relationship between ε and λ is affected by droplets with different sizes, CDSDs are divided into three portions with droplet radius < 3.75 μm (N1), radius in the range of 3.75–12.75 μm (N2) and 12.75–23.25 μm (N3), respectively. The results indicate that although the droplet concentration at different sizes generally decrease simultaneously as λ increases, the variation of standard deviation (σ) depends mainly on N3, while the mean radius (rm) decreases with decreasing N3, but increases with decreasing N1. So the influence of entrainment on CDSD causes a more dramatical decrease in σ than that in rm, and further leads to the decrease of ε as entrainment enhances. In addition, a conceptual model of CDSD evolution during entrainment-mixing processes is developed to illustrate the possible scenarios entailing different relationships between ε and λ. The number concentration of small droplets and the degree of evaporation of small droplets are found to be key factors that shift the sign (i.e., positive or negative) of the ε-λ relationship. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109033
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education (ELME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Education of Meteorological Disasters (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China; Suzhou Meteorological Bureau, Suzhou, China; Ministry of Education Key Laboratory for Earth System Modeling, Department for Earth System Science, Tsinghua University, Beijing, China; Environmental and Climate Science Department, Brookhaven National Laboratory, Upton, United States; Scripps Institution of Oceanography, University of California, San Diego, United States

Recommended Citation:
Guo X.,Lu C.,Zhao T.,et al. Observational study of the relationship between entrainment rate and relative dispersion in deep convective clouds[J]. Atmospheric Research,2018-01-01,199
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