| 摘要: |
| 温室效应引起的全球变暖是近几十年来气候变化的主要特征，但不同区域降水量变化差异较大，温湿变化的差异对生态环境产生了不同影响。探讨江河源区气候变化趋势，是研究该区域生态环境变化的重要内容。文章利用江河源区气象观测资料，分析了近42年来该区域不同站点和整个区域的平均气温、降水量、蒸发量等气象要素的变化情况。结果表明，1961年以来，江河源区全区及各站点的年、季平均气温均呈明显上升趋势，升幅随站点位置、季节的不同而变化，气温最高年份大多出现在最近十多年间；1980年以来，源区和大多数站点的平均年降水量呈减少趋势，暖季降水量普遍减少，冷季降水量则有不同程度增加；蒸发量年际问波动大，变化规律复杂，但20世纪90年代以来，源区大多数站点和整个源区的平均年蒸发量均表现为上升趋势。气温上升，降水量减少，蒸发量增大，使江河源区气候呈暖干化趋势。 |
| 关键词: 江河源区 气温 降水量 气候暖干化 |
| DOI： |
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| 基金项目:青海省重大科技攻关项目（2002-N-106） |
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| Tendency research of climate warm-dry in source regions of the Yangtse River,the Yellow River and the Lantsang River |
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| Abstract: |
| By using the data of meteorological stations in source regions of the Yangtse River,the Yellow River and the Lantsang River,the variation of air temperature,precipitation and evaporation of every seasons and annual in the regions are analyzed.The result indicates that the mean annual air temperature rises obviously all over the region at every station since 1961,and rising values vary with its location and season.The years with the highest air temperature are in the near decade.Annual precipitation has showed the tendency of reducing in the region and at most of stations since 1980.The precipitation decreases in warm seasons and increases in cool seasons.Evaporation rises in the region and most of stations after 1990's.The rising of air temperature,decreasing of precipitation and increasing of evaporation conduce to the climate warm-dry tendency in the source regions of the Yangtse River,the Yellow River and the Lantsang River. |
| Key words: the source regions of the Yangtse River,the Yellow River and the Lantsang River air perature precipitation climate warm-dry tendency |
