華北冬季氣溫變化及背景場分析
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Variation of Winter Air Temperature in North China and Physical Background
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    摘要:

    利用國家氣候中心1951~2003年全國160站月平均氣溫資料和NCEP/NCAR全球再分析資料,采用經驗正交函數(EOF)、線性趨勢變化、MK突變檢驗、相關分析、t檢驗等方法揭示50多年來華北地區冬季氣溫的時空分布特征,探討華北冬季氣溫的年代際變化與大尺度環流特征。結果表明:①華北地區冬季氣溫常表現出一致的偏低或偏高,偏低年份主要集中在20世紀80年代中期以前,80年代后期華北冬季氣溫明顯升高,由冷變暖的突變點為1987年;②華北地區冬季氣溫偏低、偏高年的北半球環流形勢存在明顯的差異,亞洲區極渦面

    Abstract:

    The spatial and temporal distribution characteristics of winter temperature over North China and the spatial distribution features of atmospheric general circulation and sea surface temperature (SST) are studied by using the monthly mean temperature of 160 stations over China from 1951 to 2003, the global NCEP/NCAR analyzed data, and the SST data from the climate diagnostic center of NOAA, through such analysis methods as EOF, linear tendency variation, MK examination, correlation, and t test. The results indicate: (1) the winter temperature over North China had a unanimous spatial variation trend, greater than normal or less than normal unanimously, with the cold years being in the period of 1951 to 1987 and the warm years in the period of 1987 to 2003; (2) there were differences in atmospheric general circulation patterns between cold and warm years, and polar vortex, with the highpressure ridge around Ural Mountains, the East Asian trough, and the Mongolian high pressure being important influence factors; (3) there was good relationship between winter temperature of North China and SST along the offshore of China.

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孔凡超,史印山,尤鳳春,池俊成.華北冬季氣溫變化及背景場分析[J].氣象科技,2007,35(2):198~203

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  • 收稿日期:2005-12-19
  • 定稿日期:2006-02-28
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