摘要
针对经典低阶谱模式存在的不足,提出了在最小二乘准则下通过计算不同函数组合与实测资料间的复相关系数,从实际观测资料中客观提取能反映具体物理现象的截断函数的新方案.克服了应用低阶谱模式研究物理现象时选取截断函数时的主观任意性.将此方法用于研究北半球夏季大气环流年际变化,利用1994年和1998年6月大气环流资料客观确定相应的函数组合,从描述大尺度大气运动的准地转两层斜压方程出发,揭示了造成这两年夏季大气环流演变存在差异的物理机制.
In order to overcome the deficiency existing 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 function and the recorded data under the least square criterion, the truncated functions which can mostly reflect the studied physical phenomenon was objectively distilled from these data. The new method overcame the deficiency of artificially selecting the mmcated functions in the classical low order spectral model. The new method being applied to study the inter-annual variation of summer atmospheric circulation over Northem 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.
出处
《应用数学和力学》
CSCD
北大核心
2006年第4期424-430,共7页
Applied Mathematics and Mechanics
基金
国家自然科学基金资助项目(40475040)
国家重点基础研究发展计划资助项目(2003CB415100)
关键词
低阶谱模式
最小二乘准则
截断函数基
夏季大气环流
物理机制
low order spectral model
least square criterion
truncated function
atmosphericnc circulation in summer
physical mechanism
