Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-1241-2017 |
Growth of ice particle mass and projected area during riming | |
Erfani, Ehsan1,2,3; Mitchell, David L.1 | |
2017-01-27 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | There is a long-standing challenge in cloud and climate models to simulate the process of ice particle riming realistically, partly due to the unrealistic parameterization of the growth of ice particle mass (m) and projected area (A) during riming. This study addresses this problem, utilizing ground-based measurements of m and ice particle maximum dimension (D) as well as theory to formulate simple expressions describing the dependence of m and A on riming. It was observed that beta in the m - D power law m = alpha D-beta appears independent of riming during the phase 1 (before the formation of graupel), with alpha accounting for the ice particle mass increase due to riming. This semi-empirical approach accounts for the degree of riming and renders a gradual and smooth ice particle growth process from unrimed ice particles to graupel, and thus avoids discontinuities in m and A during accretional growth. Once the graupel with quasi-spherical shape forms, D increases with an increase in m and A (phase 2 of riming). The treatment for riming is explicit, and includes the parameterization of the ice crystal-cloud droplet collision efficiency (E-c) for hexagonal columns and plates using hydrodynamic theory. In particular, E-c for cloud droplet diameters less than 10 mu m are estimated, and under some conditions observed in mixed-phase clouds, these droplets can account for roughly half of the mass growth rate from riming. These physically meaningful yet simple methods can be used in models to improve the riming process. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394604000001 |
WOS关键词 | COMMUNITY ATMOSPHERE MODEL ; SUPERCOOLED LIQUID WATER ; CLOUD MICROPHYSICS ; COLLISION EFFICIENCIES ; IMPROVED REPRESENTATION ; COLLECTION EFFICIENCY ; TERMINAL VELOCITIES ; CONVECTIVE CLOUDS ; GRAUPEL PARTICLES ; CYCLONIC STORMS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; 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/30389 |
专题 | 地球科学 |
作者单位 | 1.Desert Res Inst, Reno, NV USA; 2.Univ Nevada, Grad Program Atmospher Sci, Reno, NV USA; 3.George Mason Univ, Ctr Ocean Land Atmosphere Studies, Fairfax, VA 22030 USA |
推荐引用方式 GB/T 7714 | Erfani, Ehsan,Mitchell, David L.. Growth of ice particle mass and projected area during riming[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(2). |
APA | Erfani, Ehsan,&Mitchell, David L..(2017).Growth of ice particle mass and projected area during riming.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(2). |
MLA | Erfani, Ehsan,et al."Growth of ice particle mass and projected area during riming".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.2(2017). |
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