The relationship between large-scale and convective states in the tropics - Towards an improved representation of convection in large-scale models

doi:10.2172/1171131

GSTDTAP > 地球科学

DOI	10.2172/1171131
报告编号	DOE-MONASH--0002731-1
来源ID	OSTI ID: 1171131
	The relationship between large-scale and convective states in the tropics - Towards an improved representation of convection in large-scale models
	Jakob, Christian
	2015-02-26
出版年	2015
页数	166
语种	英语
国家	美国
领域	地球科学
英文摘要	This report summarises an investigation into the relationship of tropical thunderstorms to the atmospheric conditions they are embedded in. The study is based on the use of radar observations at the Atmospheric Radiation Measurement site in Darwin run under the auspices of the DOE Atmospheric Systems Research program. Linking the larger scales of the atmosphere with the smaller scales of thunderstorms is crucial for the development of the representation of thunderstorms in weather and climate models, which is carried out by a process termed parametrisation. Through the analysis of radar and wind profiler observations the project made several fundamental discoveries about tropical storms and quantified the relationship of the occurrence and intensity of these storms to the large-scale atmosphere. We were able to show that the rainfall averaged over an area the size of a typical climate model grid-box is largely controlled by the number of storms in the area, and less so by the storm intensity. This allows us to completely rethink the way we represent such storms in climate models. We also found that storms occur in three distinct categories based on their depth and that the transition between these categories is strongly related to the larger scale dynamical features of the atmosphere more so than its thermodynamic state. Finally, we used our observational findings to test and refine a new approach to cumulus parametrisation which relies on the stochastic modelling of the area covered by different convective cloud types.
英文关键词	Tropical convection Climate models
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/7065
专题	地球科学
推荐引用方式 GB/T 7714	Jakob, Christian. The relationship between large-scale and convective states in the tropics - Towards an improved representation of convection in large-scale models,2015.