DOI: 10.1175/JCLI-D-12-00650.1
Scopus记录号: 2-s2.0-84881628575
论文题名: Evaluating low-cloud simulation from an upgraded multiscale modeling framework model. Part III: Tropical and subtropical cloud transitions over the Northern Pacific
作者: Cheng A. ; Xu Dr. K.-M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 16 起始页码: 5761
结束页码: 5781
语种: 英语
Scopus关键词: Boundary layer clouds
; Community atmosphere model
; Multi-scale Modeling
; Precipitable water
; Sea ice distribution
; Sea surface temperature (SST)
; Shortwave radiative flux
; Transition locations
; Atmospheric temperature
; Clouds
; Computer simulation
; Sea ice
; Tropics
; Water wells
; Precipitation (meteorology)
; boundary layer
; climate modeling
; climatology
; cloud cover
; marine atmosphere
; numerical model
; parameterization
; sea ice
; sea surface temperature
; stratocumulus
; California
; Pacific Ocean
; Pacific Ocean (North)
; United States
英文摘要: An analysis of simulated cloud regime transitions along a transect from the subtropical California coast to the tropics for the northern summer season (June-August) is presented in this study. The Community Atmosphere Model, version 5 (CAM5), superparameterized CAM (SPCAM), and an upgraded SPCAM with intermediately prognostic higher-order closure (SPCAM-IPHOC) are used to perform global simulations by imposing climatological sea surface temperature and sea ice distributions. The seasonal-mean properties are compared with recent observations of clouds, radiation, and precipitation and with multimodel intercomparison results. There are qualitative agreements in the characteristics of cloud regimes along the transect among the three models. CAM5 simulates precipitation and shortwave radiative fluxes well but the stratocumulus-to-cumulus transition occurs too close to the coast of California. SPCAM-IPHOC simulates longwave radiative fluxes and precipitable water well, but with systematic biases in shortwave radiative fluxes. The broad, stronger ascending band in SPCAM is related to the large biases in the convective region but the characteristics of the stratocumulus region are still more realistic and the transition occurs slightly farther away from the coast than in CAM5. Even though SPCAM-IPHOC produces the most realistic seasonal-mean transition, it underestimates the mean gradient in low-cloud cover (LCC) across the mean transition location because of an overestimate of LCC in the transition and convective regions that shifts the transition locations farther from the coast. Analysis of two decoupling measures shows consistency in the mean location and the histogram of decoupling locations with those of LCC transition. CAM5, however, lacks such a consistency, suggesting a need for further refinement of its boundary layer cloud parameterization. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51726
Appears in Collections: 气候变化事实与影响
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作者单位: Climate Science Branch, NASA Langley Research Center, Science Systems and Applications, Inc., Hampton, VA, United States; Climate Science Branch, NASA Langley Research Center, Mail Stop 420, Hampton, VA 23681, United States
Recommended Citation:
Cheng A.,Xu Dr. K.-M.. Evaluating low-cloud simulation from an upgraded multiscale modeling framework model. Part III: Tropical and subtropical cloud transitions over the Northern Pacific[J]. Journal of Climate,2013-01-01,26(16)