Arid
DOI10.1007/s00382-012-1506-x
Control of deep convection by sub-cloud lifting processes: the ALP closure in the LMDZ5B general circulation model
Rio, Catherine1; Grandpeix, Jean-Yves2; Hourdin, Frederic2; Guichard, Francoise3; Couvreux, Fleur3; Lafore, Jean-Philippe3; Fridlind, Ann4; Mrowiec, Agnieszka4; Roehrig, Romain2; Rochetin, Nicolas2; Lefebvre, Marie-Pierre5; Idelkadi, Abderrahmane2
通讯作者Rio, Catherine
来源期刊CLIMATE DYNAMICS
ISSN0930-7575
出版年2013
卷号40期号:9-10页码:2271-2292
英文摘要

Recently, a new conceptual framework for deep convection scheme triggering and closure has been developed and implemented in the LMDZ5B general circulation model, based on the idea that deep convection is controlled by sub-cloud lifting processes. Such processes include boundary-layer thermals and evaporatively-driven cold pools (wakes), which provide an available lifting energy that is compared to the convective inhibition to trigger deep convection, and an available lifting power (ALP) at cloud base, which is used to compute the convective mass flux assuming the updraft vertical velocity at the level of free convection. While the ALP closure was shown to delay the local hour of maximum precipitation over land in better agreement with observations, it results in an underestimation of the convection intensity over the tropical ocean both in the 1D and 3D configurations of the model. The specification of the updraft vertical velocity at the level of free convection appears to be a key aspect of the closure formulation, as it is weaker over tropical ocean than over land and weaker in moist mid-latitudes than semi-arid regions. We propose a formulation making this velocity increase with the level of free convection, so that the ALP closure is adapted to various environments. Cloud-resolving model simulations of observed oceanic and continental case studies are used to evaluate the representation of lifting processes and test the assumptions at the basis of the ALP closure formulation. Results favor closures based on the lifting power of sub-grid sub-cloud processes rather than those involving quasi-equilibrium with the large-scale environment. The new version of the model including boundary-layer thermals and cold pools coupled together with the deep convection scheme via the ALP closure significantly improves the representation of various observed case studies in 1D mode. It also substantially modifies precipitation patterns in the full 3D version of the model, including seasonal means, diurnal cycle and intraseasonal variability.


英文关键词Deep convection parameterization Triggering and closure Oceanic versus continental convection Diurnal cycle of precipitation High resolution simulations to evaluate parameterizations assumptions
类型Article
语种英语
国家France ; USA
收录类别SCI-E
WOS记录号WOS:000318278700008
WOS关键词SHALLOW CUMULUS CONVECTION ; VERTICAL VELOCITY EVENTS ; LARGE-SCALE MODELS ; MASS-FLUX ; BOUNDARY-LAYER ; PART I ; WAKE PARAMETERIZATION ; OCEANIC CONVECTION ; SCHEME ; SIMULATIONS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176445
作者单位1.UPMC, Lab Meteorol Dynam, CNRS, IPSL, F-75005 Paris, France;
2.LMD, Paris, France;
3.GAME, CNRM, Toulouse, France;
4.NASA, Goddard Inst Space Studies, New York, NY 10025 USA;
5.CNRM, LMD, Paris, France
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Rio, Catherine,Grandpeix, Jean-Yves,Hourdin, Frederic,et al. Control of deep convection by sub-cloud lifting processes: the ALP closure in the LMDZ5B general circulation model[J],2013,40(9-10):2271-2292.
APA Rio, Catherine.,Grandpeix, Jean-Yves.,Hourdin, Frederic.,Guichard, Francoise.,Couvreux, Fleur.,...&Idelkadi, Abderrahmane.(2013).Control of deep convection by sub-cloud lifting processes: the ALP closure in the LMDZ5B general circulation model.CLIMATE DYNAMICS,40(9-10),2271-2292.
MLA Rio, Catherine,et al."Control of deep convection by sub-cloud lifting processes: the ALP closure in the LMDZ5B general circulation model".CLIMATE DYNAMICS 40.9-10(2013):2271-2292.
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