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南、北半球环状模月内活动的主要时间尺度
引用本文:李晓峰,李建平.南、北半球环状模月内活动的主要时间尺度[J].大气科学,2009,33(2):215-231.
作者姓名:李晓峰  李建平
作者单位:1.中国科学院大气物理研究所大气科学和地球流体力学国家重点实验室, 北京,100029;中国科学院研究生院, 北京,100049
基金项目:国家重点基础研究发展规划项目2006CB403600,国家自然科学基金资助项目40675046、40528006
摘    要:基于“大气环状活动带” 的概念, 利用逐日再分析资料对南、 北半球环状模 (简称SAM、 NAM) 的季节活动特征及月内活动的主要时间尺度 (Submonthly timescales) 进行了研究, 结果表明, NAM具有冬季强、 夏季弱的年循环特征, 而SAM则表现出明显的准半年循环特征。并且, 逐年的功率谱分析进一步显示: NAM的月内活动的主要时间尺度以准1周和准2周为主, 且它们具有共生性, 准3周为相对次要的周期; 而SAM的月内活动周期与NAM相似, 准2周和准1周较强, 准3周次之。NAM和SAM的月内活动在不同特征时间尺度上的空间特征及其时间演变值得进一步研究。

关 键 词:大气环状活动带  南、北半球环状模  月内时间尺度

Main Submonthly Timescals of Northern and Southern Hemispheres Annual Modes
LI Xiaofeng and LI Jianping.Main Submonthly Timescals of Northern and Southern Hemispheres Annual Modes[J].Chinese Journal of Atmospheric Sciences,2009,33(2):215-231.
Authors:LI Xiaofeng and LI Jianping
Institution:1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics. Chinese Academy of Sciences, Beijing,100029;Graduate University of Chinese Academy of Sciences, Beijing,1000492.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics. Chinese Academy of Sciences, Beijing,100029
Abstract:Based on the conception of "Annular Belts of Action (ABAs)" ,characteristics of the seasonal variation and main submonthly timescales of Northern and Southern hemispheres annular modes (SAM and NAM) are studied in this paper using NCEP/NCAR reanalysis daily data. The results show that NAM is strong in winter and weak in summer while SAM's intensity has semi-annual cycle. Furthermore,power spectrum analysis is applied year by year to detect the main submonthly timescals of anular modes,the result shows that ...
Keywords:annular belts of action  Northern and Southern hemispheres annual modes  submonthly timescales  
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