| 滇西北高原降水量时空变化特征 |
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| 引用本文： | 姚平,;陈先刚,;杨宇明,;唐寿岚.滇西北高原降水量时空变化特征[J].云南地理环境研究,2014(1):1-7. |
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| 作者姓名： | 姚平 ;陈先刚 ;杨宇明 ;唐寿岚 |
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| 作者单位： | [1]西南林业大学环境科学与工程学院,云南昆明650224; [2]云南省林业科学院,云南昆明650201; [3]香格里拉县碧塔海自然保护区管理所,云南香格里拉674400 |
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| 基金项目： | 国家自然科学基金“滇西北高原湿地湖滨带演变规律及其驱动机制研究”（U0933601）资助. |
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| 摘 要： | 利用滇西北高原1961-2009年逐月降水量资料,采用多种统计分析方法,研究滇西北高原降水量的时空变化特征。结果表明:滇西北高原冬季、夏季和年平均降水量空间分布的主要特征是一致多雨或少雨型,且均具有经向分布特征,其次为"西北部-东南部"或者"西部-东部"反位相振荡型。冬季、夏季和年平均降水量的两种主要空间分布型所对应的时间系数均以年际变化为主,周期变化主要集中在4年以下的高频振荡时域内,其次是周期为12年的年代际变化。近48年来,滇西北高原冬季和年平均降水量随时间变化总体上均以增加趋势为主,增加趋势不明显,夏季降水量变化则呈减少趋势,其中香格里拉县夏季降水量减少趋势明显。
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| 关 键 词： | 滇西北高原 降水 时空变化 |
THE TEMPORAL-SPATIAL VARIATIONS OF PRECIPITATION OVER THE PLATEAU REGION,NORTHWESTERN YUNNAN |
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| Institution: | YAO Ping , CHEN Xian - gang , YANG Yu - ming, TANG Shou - lan ( 1. Department of Environmental Science and Engineering, Southwest Forestry University, Kunming 650224, Yunnan, China ; 2. Yunnan Academy of Forestry, Kunming 650201, Yunnan, China; 3. Administrative Office of Bitahai Lake Nature Reserve in Shangri - La, Shangri - La 674400, Yunnan, China) |
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| Abstract: | Based on the monthly precipitation data from 1961 to 2009, the temporal - spatial variations of precipitation over the plateau of northwestern Yunnan were studied by using some statistical analysis methods. The results show that the most significant spatial pattern of winter, summer and annual average temperature is consistent distribution, with meridional characteristic. The second spatial pattern shows ＂northwestern - southeastern＂ or ＂western - eastern＂ anti - phase oscillation distribution. The two time series of EOF modes are mainly dominated by interannual oscillation period, variation period mainly concentrated on 4 years of high frequency oscillation, followed by a period of 12 years decadal changes. The winter and annual precipitation over the plateau of north- western Yunnan have increased in the past 48 years, but not significant, while the summer precipitation over the plateau of northwestern Yunnan, have decreased, especially, precipitation of Shangri - La decreased significantly. |
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| Keywords: | the plateau of northwestern Yunnan precipitation temporal- spatial variation |
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