DOI: 10.1175/JCLI-D-12-00134.1
Scopus记录号: 2-s2.0-84869795715
论文题名: On the Correspondence between short- and long-time-scale systematic errors in CAM4/CAM5 for the year of tropical convection
作者: Xie S. ; Ma H.-Y. ; Boyle J.S. ; Klein S.A. ; Zhang Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 22 起始页码: 7937
结束页码: 7955
语种: 英语
Scopus关键词: Absorbed radiation
; Chemical process
; Community atmospheric model
; Convergence zones
; Extratropical
; Hindcasts
; Large-scale flows
; Leadtime
; Lower stratosphere
; Model errors
; Model evaluation
; Model parameterization
; Moist process
; Parameterized
; Sea level pressure
; Southern ocean
; Stratocumulus clouds
; Subtropical ocean
; Tropical convection
; Climate models
; Parameterization
; Precipitation (meteorology)
; Sea level
; Tropical engineering
; Errors
; climate modeling
; climate prediction
; error analysis
; hindcasting
; parameterization
; weather forecasting
英文摘要: The correspondence between short- and long-time-scale systematic errors in the Community Atmospheric Model, version 4 (CAM4) and version 5 (CAM5), is systematically examined. The analysis is based on the annual-mean data constructed from long-term "free running" simulations and short-range hindcasts. The hindcasts are initialized every day with the ECMWF analysis for the Year(s) of Tropical Convection. It has been found that most systematic errors, particularly those associated with moist processes, are apparent in day 2 hindcasts. These errors steadily grow with the hindcast lead time and typically saturate after five days with amplitudes comparable to the climate errors. Examples include the excessive precipitation inmuch of the tropics and the overestimate of net shortwave absorbed radiation in the stratocumulus cloud decks over the eastern subtropical oceans and the Southern Ocean at about 608S. This suggests that these errors are likely the result of model parameterization errors as the large-scale flow remains close to observed in the first few days of the hindcasts. In contrast, other climate errors are present in the hindcasts, but with amplitudes that are significantly smaller than and do not approach their climate errors during the 6-day hindcasts. These include the cold biases in the lower stratosphere, the unrealistic double-intertropical convergence zone pattern in the simulated precipitation, and an annular mode bias in extratropical sea level pressure. This indicates that these biases could be related to slower processes such as radiative and chemical processes, which are important in the lower stratosphere, or the result of poor interactions of the parameterized physics with the large-scale flow. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52158
Appears in Collections: 气候变化事实与影响
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作者单位: Lawrence Livermore National Laboratory, Livermore, CA, United States
Recommended Citation:
Xie S.,Ma H.-Y.,Boyle J.S.,et al. On the Correspondence between short- and long-time-scale systematic errors in CAM4/CAM5 for the year of tropical convection[J]. Journal of Climate,2012-01-01,25(22)