韦志刚,董文杰,惠小英. 2000. 中国西北地区降水的演变趋势和年际变化[J]. 气象学报, 58(2):234-243, doi:10.11676/qxxb2000.024
中国西北地区降水的演变趋势和年际变化
EVOLUTION OF TREND AND INTERANNUAL OSCILLA-TORY VARIABILITIES OF PRECIPITATION OVER NORTHWEST CHINA
投稿时间:1998-01-21  修订日期:1995-06-26
DOI:10.11676/qxxb2000.024
中文关键词:  演变趋势  甚低频变化  西北地区降水
英文关键词:Trend  Interannual oscillatory variability  Precipitation over NW China
基金项目:国家重点基础研究发展规划(G1998040904-2);中国科学院KZ952-81-418项目
作者单位
韦志刚 中国科学院寒区旱区环境与工程研究所, 兰州, 730000 
董文杰 中国科学院寒区旱区环境与工程研究所, 兰州, 730000 
惠小英 中国科学院寒区旱区环境与工程研究所, 兰州, 730000 
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中文摘要:
      将PCA和SSA相结合,分析了中国西北地区降水量的演变趋势和年际变化,结果表明:西北地区的降水变化的主要趋势是1960年代初多雨,到1970年代初演变为少雨,1980年代又多雨,1990年代少雨。这种趋势在陇南和陕西中南部是最显著的,天山北麓区也是相对显著区。西北地区降水主要存在准8.5a、准3~4a和准5.1a的甚低频振荡。甚低频振荡在降水中的重要性依次为准8.5a、准3~4a和准5.1a。准8.5a振荡的振幅要比准3~4a和准5.1a振荡的振幅变化大。振荡位相在空间的分布并不完全一致。
英文摘要:
      Combinations of statistical analysesincluding principal component analysis, and singular spectrum analyses, were carried out the evolution of trend and interannual oscillatory of precipitation over N W China.From the beginning of 1960s to the initial of 1970s, the monthly precipitation appeared a downward trend; From the initial of 1970s to the initial of 1980s, the monthly precipitation appeared an upward trend ; The monthly precipitation was much in 1980s and less in 1990s.This trend was the strongest in the south of Gansu province and the south and middle of Shanxi province, was stronger in the north of Tianshan ridge.On the interannual timescales, signals of quasi-8.5a oscillation, 3-4a oscillation and quasi-5.1a oscillation whose importance were weakened in turn were found in the space-time-dependent precipitation series.The amplitude of quasi-8.5a oscillation was stronger than one of any of the other two oscillations.On any of the three oscillations, the dist ribution of phase wasn't completely same in space.
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