DOI: 10.1175/JCLI-D-13-00718.1
Scopus记录号: 2-s2.0-84907830945
论文题名: Evaluation of trigger functions for convective parameterization schemes using observations
作者: Suhas E. ; Zhang G.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 20 起始页码: 7647
结束页码: 7666
语种: 英语
Scopus关键词: Convective parameterization schemes
; Trigger functions
; annual variation
; atmospheric general circulation model
; convective system
; diurnal variation
; forecasting method
; parameterization
; trigger mechanism
英文摘要: Realistic simulation of different modes of atmospheric variability ranging from diurnal cycle to interannual variation in global climate models (GCMs) depends crucially on the convection trigger criteria. In this study, using the data from constrained variational analysis by the Atmospheric System Research program for singlecolumn models (SCM), the performance of the commonly used convective trigger functions in GCMs is evaluated based on the equitable threat score (ETS) value, a widely used forecast verification metric. From the ETS score, three consistently better-performing trigger functions were identified. They are based on the dilute and undilute convective available potential energy (CAPE) generation rate from large-scale forcing in the free troposphere (hereafter dCAPE) and parcel buoyancy at the lifting condensation level (Bechtold scheme). The key variables used to define these trigger functions are examined in detail. It is found that the dilute dCAPE trigger function performs the best consistently in both the tropical and midlatitude convective environment. Analysis of the composite fields of key variables of the trigger functions, based on the correct prediction, overprediction and underprediction of convection, and correct prediction of no-convection cases for convective onset, brings to light some critical factors responsible for the performance of the trigger functions. The lower-tropospheric advective forcing in dilute dCAPE trigger and vertical velocity in Bechtold trigger are identified to be the most importance ones. Suggestions are offered for further improvements. © 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51267
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, La Jolla, CA, United States
Recommended Citation:
Suhas E.,Zhang G.J.. Evaluation of trigger functions for convective parameterization schemes using observations[J]. Journal of Climate,2014-01-01,27(20)