DOI: 10.1175/JCLI-D-13-00555.1
Scopus记录号: 2-s2.0-84906860932
论文题名: Evaluation of cloud fraction simulated by seven SCMs against the ARM observations at the SGP site
作者: Song H. ; Lin W. ; Lin Y. ; Wolf A.B. ; Donner L.J. ; Del Genio A.D. ; Neggers R. ; Endo S. ; Liu Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 17 起始页码: 6698
结束页码: 6719
语种: 英语
Scopus关键词: Climate models
; Climatology
; Cloud cover
; Cloud fraction
; Community atmosphere model
; Convective clouds
; Single-column model
; Stratiform clouds
; Upper atmosphere
英文摘要: This study evaluates the performances of seven single-column models (SCMs) by comparing simulated cloud fraction with observations at theAtmospheric RadiationMeasurement Program(ARM) SouthernGreat Plains (SGP) site fromJanuary 1999 toDecember 2001.Comparedwith the 3-yrmean observational cloud fraction, the ECMWF SCM underestimates cloud fraction at all levels and the GISS SCM underestimates cloud fraction at levels below 200 hPa. The two GFDL SCMs underestimate lower-to-middle level cloud fraction but overestimate upper-level cloud fraction. The three Community Atmosphere Model (CAM) SCMs overestimate upper-level cloud fraction and produce lower-level cloud fraction similar to the observations but as a result of compensating overproduction of convective cloud fraction and underproduction of stratiform cloud fraction. Besides, the CAM3 and CAM5 SCMs both overestimate midlevel cloud fraction, whereas the CAM4 SCM underestimates. The frequency and partitioning analyses show a large discrepancy among the seven SCMs: Contributions of nonstratiform processes to cloud fraction production are mainly in upper-level cloudy events over the cloud cover range 10%-80%in SCMs with prognostic cloud fraction schemes and in lower-level cloudy events over the cloud cover range 15%-50%in SCMs with diagnostic cloud fraction schemes. Further analysis reveals different relationships between cloud fraction and relative humidity (RH) in the models and observations. The underestimation of lower-level cloud fraction inmost SCMs ismainly due to the larger threshold RH used in models. The overestimation of upper-level cloud fraction in the threeCAMSCMs and twoGFDL SCMs is primarily due to the overestimation of RH and larger mean cloud fraction of cloudy events plus more occurrences of RH around 40%-80%, respectively. © 2014 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51456
Appears in Collections: 气候变化事实与影响
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作者单位: Brookhaven National Laboratory, Upton, NY, United States; Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, China; Columbia University, New York, NY, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Royal Netherlands Meteorological Institute, De Bilt, Netherlands
Recommended Citation:
Song H.,Lin W.,Lin Y.,et al. Evaluation of cloud fraction simulated by seven SCMs against the ARM observations at the SGP site[J]. Journal of Climate,2014-01-01,27(17)