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DOI | 10.1016/j.atmosres.2017.09.013 |
Observational study of the relationship between entrainment rate and relative dispersion in deep convective clouds | |
Guo, Xiaohao1,2; Lu, Chunsong1,3; Zhao, Tianliang1; Liu, Yangang4; Zhang, Guang Jun5; Luo, Shi1 | |
2018 | |
发表期刊 | ATMOSPHERIC RESEARCH
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ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 199页码:186-192 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | This study investigates the influence of entrainment rate (lambda) on relative dispersion (epsilon) of cloud droplet size distributions (CDSD) in the 99 growing precipitating deep convective clouds during TOGA-COARE. The results show that entrainment suppresses epsilon, which is opposite to the traditional understanding that entrainment-mixing broadens CDSD. To examine how the relationship between epsilon and lambda is affected by droplets with different sizes, CDSDs are divided into three portions with droplet radius < 3.75 mu m (N-1), radius in the range of 3.75-12.75 mu m (N-2) and 12.75-23.25 mu m (N-3), respectively. The results indicate that although the droplet concentration at different sizes generally decrease simultaneously as lambda increases, the variation of standard deviation (sigma) depends mainly on N-3, while the mean radius (r(m)) decreases with decreasing N-3, but increases with decreasing N-1. So the influence of entrainment on CDSD causes a more dramatical decrease in a than that in r(m), and further leads to the decrease of a 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 a and lambda. 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 epsilon-lambda relationship. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000415908300014 |
WOS关键词 | DROPLET SIZE DISTRIBUTIONS ; SPECTRAL DISPERSION ; CUMULUS CLOUDS ; AIRCRAFT MEASUREMENTS ; STRATOCUMULUS CLOUDS ; THRESHOLD BEHAVIOR ; VERTICAL VELOCITY ; EFFECTIVE RADIUS ; PARAMETERIZATION ; AUTOCONVERSION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/38440 |
专题 | 地球科学 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster,China Meterol Adm, Minist Educ ELME,CIC FEMD,Key Lab Aerosol Cloud P, Joint Int Res Lab Climate & Environm Change ILCEC, Nanjing, Jiangsu, Peoples R China; 2.Suzhou Meteorol Bur, Suzhou, Peoples R China; 3.Tsinghua Univ, Minist Educ, Key Lab Earth Syst Modeling, Dept Earth Syst Sci, Beijing, Peoples R China; 4.Brookhaven Natl Lab, Environm & Climate Sci Dept, Upton, NY 11973 USA; 5.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 92103 USA |
推荐引用方式 GB/T 7714 | Guo, Xiaohao,Lu, Chunsong,Zhao, Tianliang,et al. Observational study of the relationship between entrainment rate and relative dispersion in deep convective clouds[J]. ATMOSPHERIC RESEARCH,2018,199:186-192. |
APA | Guo, Xiaohao,Lu, Chunsong,Zhao, Tianliang,Liu, Yangang,Zhang, Guang Jun,&Luo, Shi.(2018).Observational study of the relationship between entrainment rate and relative dispersion in deep convective clouds.ATMOSPHERIC RESEARCH,199,186-192. |
MLA | Guo, Xiaohao,et al."Observational study of the relationship between entrainment rate and relative dispersion in deep convective clouds".ATMOSPHERIC RESEARCH 199(2018):186-192. |
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