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
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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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。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.
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Key words:
- Tropopause /
- Tibetan Plateau /
- adjacent areas of East Asia /
- pressure field /
- EOF analysis /
- wavelet analysis
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[1] 王卫国,樊雯璇,吴涧,等.全球平流层-对流层之间臭氧通量的时空演变研究[J].地球物理学报,2006,49(6):1 595-1 607. [2] 王卫国,秦芳.臭氧层季节变化与对流层顶的关系[J].云南大学学报:自然科学版,1994,16(S1):29-34. [3] 王卫国,郭世昌,杨利群.大气臭氧垂直分布及其变化的研究[J].地球物理学报,1990,33(6):639-646. [4] 陈洪滨,卞建春,吕达仁.上对流层-下平流层交换过程研究的进展与展望[J].大气科学,2006,30(5):813-820. [5] 王卫国,袁敏,吴涧,等.大气对流层顶的臭氧时空分布变化[J].云南大学学报:自然科学版,2006,28(6):509-517. [6] 吴涧,杨茜,王卫国,等.全球对流层顶温度场演变的气候学特征分析[J].云南大学学报:自然科学版,2006,28(4):323-332. [7] 王卫国,樊雯璇,吴涧,等.全球对流层顶气压场和温度场的时空演变结构特征[J].云南大学学报:自然科学版,2006,28(2):127-135. [8] 王卫国,吴涧,刘红年,等.中国及邻近地区污染排放对对流层臭氧变化与辐射影响的研究?[J].大气科学,2005,29(5):734-746. [9] 吴涧,蒋维楣,陈新梅,等.生物质燃烧对东南亚及中国南方对流层臭氧含量影响的模拟研究[J].环境科学,2004,25(2):1-6. [10] 陈新梅,王卫国,吴涧,等.对流层垂直臭氧分布变化量对生物质燃烧响应的模拟研究[J].云南大学学报:自然科学版,2006,28(1):45-50. [11] World Meteorological Organization.Manual on Codes[J].WMO,2001,306(2):Part B. [12] SANTER B D,WEHNER M F,WIGLEY T M L,et al.Contributions of Anthropogenic and Natural Forcing to Recent Tropopause Height Changes[J].Science,2003,301:479-483. [13] 李国平,刘红武.地面热源强迫对青藏高原低涡作用的动力学分析[J].热带气象学报,2006,22(6):632-637. [14] 戴晓燕,过仲阳,吴健平,等.夏季青藏高原上影响MCS东移的动力场特征研究[J].热带气象学报,2006,22 (6):600-604. [15] 魏凤英.现代气候统计诊断预测技术[M].北京:气象出版社,1999:114-122. [16] 赵松年,熊小芸.子波变换与子波分析[M].电子工业出版社,1996:97-141.
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