globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017MS000915
Scopus记录号: 2-s2.0-85019957620
论文题名:
Uncertainties related to the representation of momentum transport in shallow convection
作者: Schlemmer L; , Bechtold P; , Sandu I; , Ahlgrimm M
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期:2
起始页码: 1269
结束页码: 1291
语种: 英语
英文关键词: Clouds ; Heat convection ; Large eddy simulation ; Momentum transfer ; Weather forecasting ; CONSTRAIN ; Convective clouds ; European centre for medium-range weather forecasts ; Integrated forecasting systems ; Momentum transports ; Parametrizations ; RICO ; Shallow convection ; Momentum ; cloud cover ; convection ; large eddy simulation ; parameterization ; uncertainty analysis ; Colorado ; Rico ; United States
英文摘要: Convective momentum transport (CMT) has mostly been studied for deep convection, whereas little is known about its characteristics and importance in shallow convection. In this study, CMT by shallow convection is investigated by analyzing both data from large-eddy simulations (LESs) and reforecasts performed with the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts (ECMWF). In addition, the central terms underlying the bulk mass-flux parametrization of CMT are evaluated offline. Further, the uncertainties related to the representation of CMT are explored by running the stochastically perturbed parametrizations (SPP) approach of the IFS. The analyzed cases exhibit shallow convective clouds developing within considerable low-level wind shear. Analysis of the momentum fluxes in the LES data reveals significant momentum transport by the convection in both cases, which is directed downgradient despite substantial organization of the cloud field. A detailed inspection of the convection parametrization reveals a very good representation of the entrainment and detrainment rates and an appropriate representation of the convective mass and momentum fluxes. To determine the correct values of mass-flux and in-cloud momentum at the cloud base in the parametrization yet remains challenging. The spread in convection-related quantities generated by the SPP is reasonable and addresses many of the identified uncertainties. © 2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75782
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom

Recommended Citation:
Schlemmer L,, Bechtold P,, Sandu I,et al. Uncertainties related to the representation of momentum transport in shallow convection[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)
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