Changes of Pan Evaporation in the Recent 40 Years in the Yellow River Basin
Changes of Pan Evaporation in the Recent 40 Years in the Yellow River Basin
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DOI：
10.1080/02508060408691814
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发表时间：
2004-12
影响因子：
2.6
通讯作者：
Chang-Wu Liu;Yan Zeng
中科院分区：
文献类型：
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作者：
Chang-Wu Liu;Yan Zeng
利用黄河流域附近123个气象站1960—2000年的监测资料，分析了黄河流域蒸发皿蒸发量的时空分布特征及其变化趋势。结果表明：近40 a来，黄河流域年平均气温虽然平均升高了0.6°，但PE的速率呈稳定下降趋势，特别是在夏季和春季。与60 ~ 70年代相比，80 ~ 90年代蒸发皿年蒸发量减少了126mm，减少了7.0%。变化速率的空间分布表明，这种变化趋势具有普遍性，但不具有普遍性，黄河上游和下游PE显著降低，中游PE略有增加。进一步分析表明，由于云和气溶胶增多，PE的减少主要与日照时数和太阳辐照度的减少有关。
Abstract Based on monitoring data of 123 meteorological stations from 1960 to 2000 near or in the Yellow River Basin, the spatial and temporal distributions and their trends for pan evaporation (PE) are investigated in this study. The results indicate that, despite the annual mean air temperature over the Yellow River Basin has, on average, increased by 0.6° over the past 40 years, the rate of PE has steadily decreased, especially in summer and spring. Compared with the period of 1960s to 1970s, the rate of annual pan evaporation during 1980s to 1990s has decreased by 126mm or 7.0 percent. Spatial distribution of the rate of change show that this kind of trend is general but not universal, PE has significantly decreased over the upper and lower reaches of the Yellow River, but increased to a small degree over the middle reaches. Further analyses show that the decrease of PE is mainly related to reductions in sunshine durations and solar irradiance, owing to more clouds and aerosols.