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DOI | 10.1175/JAS-D-17-0305.1 |
Using a Variability Factor to Account for Cloud Microphysical Inhomogeneity in Mesoscale Models | |
Kogan, Yefim | |
2018-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:8页码:2549-2561 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Different formulations of the joint probability distribution function (JPDF) based on large-eddy simulation (LES) studies of shallow cumulus and cumulus congestus clouds were evaluated. It was shown that inhomogeneity in both cloud types can be quantified by their respective JPDFs calculated using datasets from the entire simulation time period (generic JPDFs). The generic JPDF can be a priori integrated and yield a one-dimensional variability factor (V factor) specific for each cloud type. A quite accurate approximation of V factors by an analytical function in the form of a third-order polynomial was obtained and can be easily implemented in mesoscale models. The effect on precipitation of conversion rates modified by V factors was also evaluated in LES sensitivity studies of shallow cumulus (Cu) and congestus Cu clouds. The surface precipitation increased significantly when V factors were taken into account. The sensitivity experiments revealed that most of the increase resulted from the modified autoconversion process. The effect of accretion rates modified by V factors was much less significant, primarily because of the nearly linear dependence of accretion on its parameters. This fact shows the importance of the most accurate formulation of the autoconversion process. |
英文关键词 | Cloud microphysics Clouds Cumulus clouds Cloud parameterizations Microscale processes variability |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438489200004 |
WOS关键词 | PROBABILITY DENSITY-FUNCTIONS ; LARGE-EDDY SIMULATION ; BOUNDARY-LAYER CLOUDS ; SHALLOW CUMULUS ; EXPLICIT MICROPHYSICS ; RESOLVING MODELS ; SMALL-SCALE ; PART I ; PARAMETERIZATION ; STRATOCUMULUS |
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/29539 |
专题 | 地球科学 |
作者单位 | NorthWest Res Associates, Redmond, WA 98052 USA |
推荐引用方式 GB/T 7714 | Kogan, Yefim. Using a Variability Factor to Account for Cloud Microphysical Inhomogeneity in Mesoscale Models[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(8):2549-2561. |
APA | Kogan, Yefim.(2018).Using a Variability Factor to Account for Cloud Microphysical Inhomogeneity in Mesoscale Models.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(8),2549-2561. |
MLA | Kogan, Yefim."Using a Variability Factor to Account for Cloud Microphysical Inhomogeneity in Mesoscale Models".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.8(2018):2549-2561. |
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