NEW METHOD FOR LOW ORDER SPECTRAL MODEL AND ITS APPLICATION  

作　　者：曹杰 尤亚磊 

机构地区：[1]Department of Atmospheric Science Yunnan University,Kunming 650091,P. R. China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2006年第4期477-484,共8页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.40475040)the Major State Basic Development Program of China(No.2003CB415100)

摘　　要：In order to overcome the deficiency in classical method of low order spectral model, a new method for low order spectral model was advanced. Through calculating the multiple correlation coefficients between combinations of different functions and the recorded data under the least square criterion, the truncated functions which can mostly reflect the studied physical phenomenon were objectively distilled from these data. The new method overcomes the deficiency of artificially selecting the truncated functions in the classical low order spectral model. The new method being applied to study the inter-annual variation of summer atmospheric circulation over Northern Hemisphere, the truncated functions were obtained with the atmospheric circulation data of June 1994 and June 1998. The mechanisms for the two-summer atmospheric circulation variations over Northern Hemisphere were obtained with two-layer quasi-geostrophic baroclinic equation.In order to overcome the deficiency in classical method of low order spectral model, a new method for low order spectral model was advanced. Through calculating the multiple correlation coefficients between combinations of different functions and the recorded data under the least square criterion, the truncated functions which can mostly reflect the studied physical phenomenon were objectively distilled from these data. The new method overcomes the deficiency of artificially selecting the truncated functions in the classical low order spectral model. The new method being applied to study the inter-annual variation of summer atmospheric circulation over Northern Hemisphere, the truncated functions were obtained with the atmospheric circulation data of June 1994 and June 1998. The mechanisms for the two-summer atmospheric circulation variations over Northern Hemisphere were obtained with two-layer quasi-geostrophic baroclinic equation.

关 键 词：low order spectral model least square criterion truncated function atmospheric circulation in summer physical mechanism 

分 类 号：O433[机械工程—光学工程]