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DOI | 10.1175/JAS-D-19-0107.1 |
Condensational and Collisional Growth of Cloud Droplets in a Turbulent Environment | |
Li, Xiang-Yu1,2,3,4,5,6,7; Brandenburg, Axel3,4,6,7,8; Svensson, Gunilla1,2,5; Haugen, Nils E. L.9,10; Mehlig, Bernhard11; Rogachevskii, Igor3,4,12 | |
2020 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:1页码:337-353 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; USA; Norway; Israel |
英文摘要 | We investigate the effect of turbulence on the combined condensational and collisional growth of cloud droplets by means of high-resolution direct numerical simulations of turbulence and a superparticle approximation for droplet dynamics and collisions. The droplets are subject to turbulence as well as gravity, and their collision and coalescence efficiencies are taken to be unity. We solve the thermodynamic equations governing temperature, water vapor mixing ratio, and the resulting supersaturation fields together with the Navier-Stokes equation. We find that the droplet size distribution broadens with increasing Reynolds number and/or mean energy dissipation rate. Turbulence affects the condensational growth directly through supersaturation fluctuations, and it influences collisional growth indirectly through condensation. Our simulations show for the first time that, in the absence of the mean updraft cooling, supersaturation-fluctuation-induced broadening of droplet size distributions enhances the collisional growth. This is contrary to classical (nonturbulent) condensational growth, which leads to a growing mean droplet size, but a narrower droplet size distribution. Our findings, instead, show that condensational growth facilitates collisional growth by broadening the size distribution in the tails at an early stage of rain formation. With increasing Reynolds numbers, evaporation becomes stronger. This counteracts the broadening effect due to condensation at late stages of rain formation. Our conclusions are consistent with results of laboratory experiments and field observations, and show that supersaturation fluctuations are important for precipitation. |
英文关键词 | Cloud droplets Cloud microphysics |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000504707800001 |
WOS关键词 | PART II ; STOCHASTIC CONDENSATION ; NUMERICAL-SIMULATION ; MICROSCOPIC APPROACH ; AEROSOL-PARTICLES ; SIZE DISTRIBUTION ; HEAVY-PARTICLES ; DROPS ; FLOW ; FLUCTUATIONS |
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/280263 |
专题 | 地球科学 |
作者单位 | 1.Stockholm Univ, Dept Meteorol, Stockholm, Sweden; 2.Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden; 3.KTH Royal Inst Technol, NORDITA, Stockholm, Sweden; 4.Stockholm Univ, Stockholm, Sweden; 5.Swedish E Sci Res Ctr, Stockholm, Sweden; 6.Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA; 7.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 8.Stockholm Univ, Dept Astron, Stockholm, Sweden; 9.SINTEF Energy Res, Trondheim, Norway; 10.Norwegian Univ Sci & Technol NTNU, Dept Energy & Proc Engn, Trondheim, Norway; 11.Gothenburg Univ, Dept Phys, Gothenburg, Sweden; 12.Ben Gurion Univ Negev, Dept Mech Engn, Beer Sheva, Israel |
推荐引用方式 GB/T 7714 | Li, Xiang-Yu,Brandenburg, Axel,Svensson, Gunilla,et al. Condensational and Collisional Growth of Cloud Droplets in a Turbulent Environment[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(1):337-353. |
APA | Li, Xiang-Yu,Brandenburg, Axel,Svensson, Gunilla,Haugen, Nils E. L.,Mehlig, Bernhard,&Rogachevskii, Igor.(2020).Condensational and Collisional Growth of Cloud Droplets in a Turbulent Environment.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(1),337-353. |
MLA | Li, Xiang-Yu,et al."Condensational and Collisional Growth of Cloud Droplets in a Turbulent Environment".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.1(2020):337-353. |
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