气候变化领域集成服务门户(CCPortal): Evaluating Marine Stratocumulus Clouds in the CNRM-CM6-1 Model Using Short-Term Hindcasts

CCPortal

DOI	10.1029/2018MS001461
	Evaluating Marine Stratocumulus Clouds in the CNRM-CM6-1 Model Using Short-Term Hindcasts
	Brient F.; Roehrig R.; Voldoire A.
发表日期	2019
ISSN	19422466
起始页码	127
结束页码	148
卷号	11 期号:1
英文摘要	The representation of stratocumulus by the atmospheric component of the Centre National de Recherches Météorologiques model version 6 (CNRM-CM6-1) is assessed. An Atmospheric Model Intercomparison Project-type simulation is first used to document the main model errors, namely, a large lack of stratocumulus over the eastern part of tropical ocean basins. Short-term hindcasts, following the Transpose-Atmospheric Model Intercomparison Project framework, are then used to better assess the timescales associated with the cloud bias growth and to highlight the processes leading to them. These biases are shown to appear within only a few hours, independently of errors in the large-scale circulation that set up within a few days. Key processes underlying the low-cloud formation are thus mainly local and, to the first order, do not imply any feedback between the model physics and the large-scale dynamics. As a consequence, short-term hindcasts provide a relevant framework to investigate whether the low-cloud underestimate is related to errors in the large-scale state variables or to errors in the model parameterizations. Sensitivity tests highlight that the involved processes arise (1) mostly from misrepresentation of subgrid effects on cloud formation and (2) partly from biases in drying induced by cloud-top entrainment mixing. Improvements in the representation of stratocumulus in the CNRM-CM6-1 model might thus be expected by including a more realistic subgrid-scale temperature and moisture distribution, that would link convective and turbulence processes. Finally, this study confirms the potential of short-term hindcasts, which provide a trustworthy framework to evaluate and develop climate model parameterizations. ©2018. The Authors.
英文关键词	climate model; parameterization; short-term hindcasts; stratocumulus
语种	英语
scopus关键词	Clouds; Errors; Parameterization; Atmospheric components; Atmospheric model intercomparison projects; Hindcasts; Large-scale circulation; Large-scale dynamics; Marine stratocumulus clouds; Moisture distribution; stratocumulus; Climate models; atmospheric modeling; climate modeling; entrainment; error analysis; hindcasting; model validation; moisture transfer; parameterization; sampling bias; stratocumulus; turbulence
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/156994
作者单位	CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France
推荐引用方式 GB/T 7714	Brient F.,Roehrig R.,Voldoire A.. Evaluating Marine Stratocumulus Clouds in the CNRM-CM6-1 Model Using Short-Term Hindcasts[J],2019,11(1).
APA	Brient F.,Roehrig R.,&Voldoire A..(2019).Evaluating Marine Stratocumulus Clouds in the CNRM-CM6-1 Model Using Short-Term Hindcasts.Journal of Advances in Modeling Earth Systems,11(1).
MLA	Brient F.,et al."Evaluating Marine Stratocumulus Clouds in the CNRM-CM6-1 Model Using Short-Term Hindcasts".Journal of Advances in Modeling Earth Systems 11.1(2019).