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《Climatic and Environmental Research》 2010-01
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A Study of Systematical Error about Cloud Cover Diagnosis Scheme in General Circulation Model

WANG Yongqing1,ZHANG Nan1,LIU Min2,3,and WANG Bizheng21 Key Laboratory of Meteorological Disaster of Ministry of Education,School of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 2100442 International Center for Climate and Environmental Sciences,Institute of Atmosphere Physics,Chinese Academy of Sciences,Beijing 1000293 Jiangsu Provincial Meteorological Bureau,Nanjing 210008  
The diagnosis scheme of cloud cover is analyzed deeply. No matter how the relationship between cloud cover and other variables is,the discrete or continuous type,the conclusion is the same,that is,the simulated cloud cover will be systematically less than the actual value if their relationship is described by the convex function,and the simulated cloud cover will be systematically more than the actual value if their relationship is described by the concave function. Therefore,in the case of Slingo cloud cover scheme,large-scale cloud cover will be systematically less than the actual cloud cover,and in the case of cumulus convection,the corresponding cloud cover will be more than the actual cloud cover. It is also showed that the relationship between the cloud cover and this meteorological variable has high correlation locally and the degree of correlation declines sharply after long-time average if the other variables are the high frequency oscillation type. And the relationship between the cloud cover and this meteorological variable has high correlation locally after long-time average but low correlation after short-time average if the other variables are the stable type. Thus,there are systematical errors about the cloud cover scheme,including Slingo scheme,and it is expected that the existing schemes should be replaced by a new scheme which is more reasonable on physics.
【Fund】: 国家自然科学基金项目40875033;; 中国科学院重大项目KZCX2-YW-217;; 中国科学院大气物理研究所创新前沿重点项目IAP070116;; 国家重点基础研究发展计划2009CB421503
【CateGory Index】: P426.53
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【References】
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1 Wang Bizheng and Zeng Qingcun (State Key Laboratory of Numerical Modeling Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029);Observational Fact of Non-Convective Clouds and Its Significance on the Design of Atmospheric General Circulation Model[J];Climatic and Environmental Research;2001-01
【Co-citations】
Chinese Journal Full-text Database 1 Hits
1 ZHANG Qi1,2,LI Yueqing2,YANG Yunyun3(1.College of Atmospheric Science,Chengdu University of Information Technology,Chengdu,610225; 2.Institute of Plateau Meteorology,CMA,Chengdu,610072; 3.Hunan Provincial Meteorological Bureau,Changsha,410007);Research Progress on the Cloudage and Its Relation with Precipitation in China[J];Plateau and Mountain Meteorology Research;2011-01
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