气候变化领域集成服务门户(CCPortal): Simulated Precipitation Diurnal Variation With a Deep Convective Closure Subject to Shallow Convection in Community Atmosphere Model Version 5 Coupled With CLUBB

CCPortal

DOI	10.1029/2020MS002050
	Simulated Precipitation Diurnal Variation With a Deep Convective Closure Subject to Shallow Convection in Community Atmosphere Model Version 5 Coupled With CLUBB
	Yang B.; Wang M.; Zhang G.J.; Guo Z.; Qian Y.; Huang A.; Zhang Y.
发表日期	2020
ISSN	19422466
卷号	12 期号:7
英文摘要	In order to improve the physical consistency between shallow and deep convection, we modify the deep convective closure in the Community Atmosphere Model version 5 (CAM5) coupled with a third-order turbulence closure parameterization (i.e., Cloud Layers Unified by Binormals [CLUBB]). The revised closure reserves a portion of the total convective available potential energy for shallow convection via utilizing the heating and moistening profiles from CLUBB to distribute moisture and energy between shallow and deep convection. Simulations at two resolutions (i.e., 2° and 0.5°, respectively) are conducted to investigate the impacts of convective closure on the simulated precipitation diurnal variations. Results from low-resolution simulations show that the revised closure suppresses deep convection until the lower troposphere is sufficiently moistened by shallow convection, which improves the precipitation diurnal variation simulations compared with the default closure, with the precipitation diurnal peak over tropical lands delayed from 12LST to 19LST. The revised closure better simulates the diurnal variations for precipitation over the Asian monsoon region, such as the delayed precipitation onset, but still fails to well capture the nighttime peak for precipitation there. This deficiency is alleviated to some extent when applying the revised closure in high-resolution simulations, but nighttime precipitation is still underestimated probably because key processes responsible for nighttime convection are missing. Overall, our results indicate that establishing the consistency between shallow and deep convection is critical for the precipitation diurnal cycle simulations. ©2020. The Authors.
英文关键词	CLUBB; convective closure; precipitation diurnal variation; shallow and deep convection
语种	英语
scopus关键词	Potential energy; Community atmosphere model; Convective available potential energies; Deep convection; Diurnal variation; High resolution simulations; Lower troposphere; Shallow convection; Turbulence closures; Natural convection; atmospheric modeling; convective system; diurnal variation; monsoon; parameterization; precipitation assessment; simulation; spatial resolution; troposphere; Asia
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156694
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, China; CMA-NJU Joint Laboratory for Climate Prediction Studies, Nanjing University, Nanjing, China; Joint International Research Laboratory of Atmospheric and Earth System Sciences and Institute for Climate and Global Change Research, Nanjing University, Nanjing, China; Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Yang B.,Wang M.,Zhang G.J.,et al. Simulated Precipitation Diurnal Variation With a Deep Convective Closure Subject to Shallow Convection in Community Atmosphere Model Version 5 Coupled With CLUBB[J],2020,12(7).
APA	Yang B..,Wang M..,Zhang G.J..,Guo Z..,Qian Y..,...&Zhang Y..(2020).Simulated Precipitation Diurnal Variation With a Deep Convective Closure Subject to Shallow Convection in Community Atmosphere Model Version 5 Coupled With CLUBB.Journal of Advances in Modeling Earth Systems,12(7).
MLA	Yang B.,et al."Simulated Precipitation Diurnal Variation With a Deep Convective Closure Subject to Shallow Convection in Community Atmosphere Model Version 5 Coupled With CLUBB".Journal of Advances in Modeling Earth Systems 12.7(2020).