气候变化领域集成服务门户(CCPortal): Unified Parameterization of Convective Boundary Layer Transport and Clouds With the Thermal Plume Model

CCPortal

DOI	10.1029/2019MS001666
	Unified Parameterization of Convective Boundary Layer Transport and Clouds With the Thermal Plume Model
	Hourdin F.; Jam A.; Rio C.; Couvreux F.; Sandu I.; Lefebvre M.-P.; Brient F.; Idelkadi A.
发表日期	2019
ISSN	19422466
起始页码	2910
结束页码	2933
卷号	11 期号:9
英文摘要	The representation of stratocumulus clouds, and of the stratocumulus to cumulus transitions which are ubiquitous features of marine boundary layer clouds, remains a challenge for climate models. We show how a mass flux representation of boundary layer convective structures combined with an eddy diffusivity scheme, the “thermal plume model,” first developed to represent cumulus clouds, can also adequately simulate stratocumulus and the stratocumulus to cumulus transition in a climate model. To achieve this, the detrainment formulation, in which detrainment increases for increasing negative buoyancy, has to be slightly modified: the buoyancy of a thermal plume parcel of air is computed by comparing the virtual potential temperature θv,th of the parcel with that of the surrounding environment θv,env at a given distance above instead of at the same level. This is consistent with the picture of detrained air parcels that experience some overshoot and reach a final destination at a level lower than the one at which they effectively leave the cloud or organized convective plume. The impacts of this modification are documented both for selected cases of stratocumulus, in comparison with large-eddy simulations, and in full 3-D climate simulations, in comparison with satellite observations of cloud cover. The modified scheme provides a uniform treatment of the dry convective boundary layer, of cumulus clouds, of stratocumulus, and of the transition from stratocumulus to cumulus. It is included in the most recent version of the LMDZ atmospheric general circulation model. ©2019. The Authors.
英文关键词	convective boundary layer; global climate model; mass flux scheme; stratocumulus
语种	英语
scopus关键词	Boundary layer flow; Boundary layers; Buoyancy; Clouds; Large eddy simulation; Thermal plumes; Atmospheric general circulation models; Convective boundary layers; Dry convective boundary layer; Global climate model; Marine boundary layer clouds; Satellite observations; stratocumulus; Surrounding environment; Climate models; atmospheric general circulation model; atmospheric modeling; boundary layer; climate modeling; cloud cover; convective boundary layer; global climate; potential temperature; stratocumulus
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/156864
作者单位	Laboratoire de Météorologie Dynamique, IPSL, Sorbonne-Université, CNRS, Paris, France; CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; Research Department, European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
推荐引用方式 GB/T 7714	Hourdin F.,Jam A.,Rio C.,et al. Unified Parameterization of Convective Boundary Layer Transport and Clouds With the Thermal Plume Model[J],2019,11(9).
APA	Hourdin F..,Jam A..,Rio C..,Couvreux F..,Sandu I..,...&Idelkadi A..(2019).Unified Parameterization of Convective Boundary Layer Transport and Clouds With the Thermal Plume Model.Journal of Advances in Modeling Earth Systems,11(9).
MLA	Hourdin F.,et al."Unified Parameterization of Convective Boundary Layer Transport and Clouds With the Thermal Plume Model".Journal of Advances in Modeling Earth Systems 11.9(2019).