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DOI | 10.1175/MWR-D-14-00251.1 |
A Dynamically Computed Convective Time Scale for the Kain-Fritsch Convective Parameterization Scheme | |
Bullock, O. Russell, Jr.1; Alapaty, Kiran1; Herwehe, Jerold A.1; Kain, John S.2 | |
发表日期 | 2015-06-01 |
ISSN | 0027-0644 |
卷号 | 143期号:6页码:2105-2120 |
英文摘要 | Many convective parameterization schemes define a convective adjustment time scale tau as the time allowed for dissipation of convective available potential energy (CAPE). The Kain-Fritsch scheme defines tau based on an estimate of the advective time period for deep convective clouds within a grid cell, with limits of 1800 and 3600 s, based on practical cloud-lifetime considerations. In simulations from the Weather Research and Forecasting (WRF) Model using 12-km grid spacing, the value of tau often defaults to the lower limit, resulting in relatively rapid thermodynamics adjustments and high precipitation rates. Herein, a new computation for tau in the Kain-Fritsch scheme is implemented based on the depth of the buoyant layer and the convective velocity scale. This new tau formulation is applied using 12- and 36-km model grid spacing in conjunction with a previous modification that takes into account the radiation effects of parameterized convective clouds. The dynamically computed convective adjustment time scale is shown to reduce the precipitation bias by approximately 15% while also providing improved simulations of inland rainfall from tropical storms. |
语种 | 英语 |
WOS记录号 | WOS:000355190900008 |
来源期刊 | MONTHLY WEATHER REVIEW |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/57381 |
作者单位 | 1.US EPA, Natl Exposure Res Lab, Res Triangle Pk, NC 27711 USA; 2.NOAA, Natl Severe Storms Lab, Norman, OK 73069 USA |
推荐引用方式 GB/T 7714 | Bullock, O. Russell, Jr.,Alapaty, Kiran,Herwehe, Jerold A.,et al. A Dynamically Computed Convective Time Scale for the Kain-Fritsch Convective Parameterization Scheme[J]. 美国环保署,2015,143(6):2105-2120. |
APA | Bullock, O. Russell, Jr.,Alapaty, Kiran,Herwehe, Jerold A.,&Kain, John S..(2015).A Dynamically Computed Convective Time Scale for the Kain-Fritsch Convective Parameterization Scheme.MONTHLY WEATHER REVIEW,143(6),2105-2120. |
MLA | Bullock, O. Russell, Jr.,et al."A Dynamically Computed Convective Time Scale for the Kain-Fritsch Convective Parameterization Scheme".MONTHLY WEATHER REVIEW 143.6(2015):2105-2120. |
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