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| 青藏高原及东亚邻近区域对流层顶气压场的时空演变结构分析 |
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王卫国1, 孙绩华2, 吴涧1, 杨利群3, 金建德4, 杨茜1, 王颢樾1, 陈新梅1,2, 左群杰1, 樊雯璇1
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1.云南大学大气科学系, 云南, 昆明, 650091;2.云南省气象科学研究所, 云南, 昆明, 650034;3.贵州省气象局, 贵州, 贵阳, 550002;4.贵阳市气象局, 贵州, 贵阳, 550002
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| 摘要: |
| 利用经验正交函数分解(EOF)方法,对1948～2004年青藏高原及东亚邻近区域对流层顶气压场的时空演变结构进行了分析。由EOF分解得到的第1模态所占的方差贡献率较大,对应的空间分布场及其时间系数变化均能有效地反映气压场的主要演变特征。各季节不同模态呈现的高纬度、副热带和热带地区的空间场结构形态具有共性与季节性特征,且对流层顶断裂带位置变化也较为清晰。零等值线的季节性摆动,在冬季处于最北端。热带气压场随时间的变化与时间系数的变化相似性最大,不同模态的时间系数变化具有明显周期振荡现象。同时,对各季节第1模态的时间系数变化进行Morlet小波分析,进一步得到了不同季节气压场年际和年代际变化的结构特征。对流层顶冬半年的时域演变尺度大于夏半年,并具有复杂的多时间尺度结构。 |
| 关键词: 对流层顶 青藏高原 东亚邻近区域 气压场 EOF分析 小波分析 |
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| 基金项目:中国气象局气候变化专项(CCSF2007–46);国家自然科学基金(40675007);云南省自然科学基金(2005D0006M);中国气象局成都高原气象开放实验室基金课题(LPM2007007)共同资助 |
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| STRUCTURE ANALYSIS OF THE SPATIAL-TEMPORAL FEATURE OF TROPOPAUSE PRESSURE FIELD OVER THE TIBETAN PLATEAU AND ADJACENT AREAS OF EAST ASIA |
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WANG Wei-guo1, SUN Ji-hua2, WU Jian1, YANG Li-qun3, JIN Jian-de4, YANG Qian1, WANG Hao-yun1, CHEN Xin-mei1,2, ZUO Qun-jie1, FAN Wen-xuan1
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1.Department of Atmosphere Science, Yunnan University, Kunming 650091, China;2.Yunnan Research Institute of Meteorological Science, Kunming 650034, China;3.Meteorological Bureau of Guizhou Province, Guiyang 550002, China;4.Guiyang Meteorological Bureau, Guiyang 550002, China
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| Abstract: |
| The spatial-temporal distribution feature of tropopause pressure field over the Tibetan Plateau and adjacent areas from 1948 to 2004 is analyzed using the method of Empirical Orthogonal Function(EOF).The spatial distributions and time coefficients of the first mode of EOF can effectively denote the main characteristics of the pressure field.The spatial structures in different seasons of different modes of EOF show common characteristics in the high latitude,subtropical and tropical area,and the variations of the location of tropopause break are relatively clear.The zero isolines are at the northernmost in the winter.The change of the tropical pressure field is most similar with that of the time coefficients,and the time coefficients of different modes present obvious characteristics of periodical oscillation.In addition,the Morlet wavelet method is used to analyze the change of time coefficients of the first mode in each season,and the interannual and interdecadal characteristics of pressure field structure in different seasons are obtained.At the tropopause the period of time in winter is larger than that in summer,and it has complicated multi-time scale structure. |
| Key words: Tropopause Tibetan Plateau adjacent areas of East Asia pressure field EOF analysis wavelet analysis |