摘要
利用经验正交函数分解（EOF）方法对57a（1948-2004年）NCEP／NCAR全球对流层顶月平均温度场进行分析，并讨论了57a的主要特征向量空间分布及其对应的时间系数的演变，结果分析表明：第1模态的时空分布特征能够较好地反映对流层顶温度场结构的分布状况，且具有明显的季节变化；南北半球的温度场的空间分布结构不太一致，南半球纬向分布较为平稳，而北半球经向和纬向活动都比较强，且有明显的温度槽脊结构；南北半球的极地对流层顶温度结构在不同的季节有不同的变化趋势；南北半球热带对流层的第1模态温度场全年具有整体一致型分布；温度场各个季节的时间系数变化具有明显的多时间尺度特征．
The monthly averaged global tropopause temperature data in recent 57 years （from 1948 to 2004） is analyzed by the EOF method, the spatial distribution and corresponding temporal variation are also discussed, The result indicates that the first EOF mode can better reflect the structure distribution of tropopause temperature, and has obvious season variety; the spatial distribution of temperature fields is different in southern and northern hemisphere, the longitudinal distribution is steady in southern hemisphere but the meridional and longitudinal activity is stronger in northern hemisphere, the structure of trough and ridge is also obvious; Polar tropopause temperature structure has different trend in two hemisphere; The first EOF mode of tropical tropopause temperature has the same distribution character all year round;Temporal variation of temperature field in each season appears multi-timescale features obviously.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第4期323-332,共10页
Journal of Yunnan University(Natural Sciences Edition)
基金
云南省自然科学基金资助项目(2003D0011M
2005D0006M)
中国气象局成都高原气象开放实验室基金课题资助(LPM2005001)
关键词
对流层顶
温度场
BOF方法
小波分析
tropopause
temperature field
EOF method
wavelet analysis
