| 中国西北地区降水的演变趋势和年际变化 |
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| 引用本文： | 韦志刚,董文杰,惠小英.中国西北地区降水的演变趋势和年际变化[J].气象学报,2000,58(2):234-243. |
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| 作者姓名： | 韦志刚 董文杰 惠小英 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所,兰州,730000 |
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| 基金项目： | 国家重点基础研究发展规划!( G1 9980 4 0 90 4 -2 )，中国科学院 KZ952 -81 -4 1 8项目 |
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| 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 1 960年代初多雨 ,到 1 970年代初演变为少雨 ,1 980年代又多雨 ,1 990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 5.1 a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 5.1 a。准 8.5a振荡的振幅要比准 3～ 4a和准5.1 a振荡的振幅变化大。振荡位相在空间的分布并不完全一致。
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| 关 键 词： | 演变趋势 甚低频变化 西北地区降水 |
| 收稿时间： | 1998/1/21 0:00:00 |
| 修稿时间： | 1995/6/26 0:00:00 |
EVOLUTION OF TREND AND INTERANNUAL OSCILLA-TORY VARIABILITIES OF PRECIPITATION OVER NORTHWEST CHINA |
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| Wei Zhigang,Dong Wenjie and Hui Xiaoying.EVOLUTION OF TREND AND INTERANNUAL OSCILLA-TORY VARIABILITIES OF PRECIPITATION OVER NORTHWEST CHINA[J].Acta Meteorologica Sinica,2000,58(2):234-243. |
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| Authors: | Wei Zhigang Dong Wenjie and Hui Xiaoying |
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| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciencs, Lanzhou, 730000;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciencs, Lanzhou, 730000;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciencs, Lanzhou, 730000 |
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| Abstract: | Combinations of statistical analyses including principal component analysis, and singular spectrum analyses, were carried out the evolution of trend and interannual oscillatory of precipitation over NW 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 distribution of phase wasn't completely same in space. |
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| Keywords: | Trend Interannual oscillatory variability Precipitation over NW China |
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