云南省蒸发量时空分布及年际变化分析

Analysis on Temporal and Spatial Distribution and Inter-annual Change of the Evaporation Capacity in Yunnan Province

根据56个蒸发站E-601型蒸发器的蒸发观测资料,分析了云南省蒸发量的时空分布规律及年际变化特点。云南省东部和西部边缘地带年蒸发量较小,滇中一带以及金沙江流域河谷地带年蒸发量较大。蒸发量年际变化具有春夏季较大、秋冬季较小的特点。近30年来,云南省蒸发量有普遍减小的趋势,20世纪90年代蒸发量普遍减小的可能原因是日照时数减少和风速减小。

According to the data coming from56sampling stations,characteristics of temporal and spatial distribution and inter-annual change of the evaporation capacity(observed by evaporation pan of type E-601)in Yunnan Province are analyzed and researched.The values of annual evaporation capacity in the edge of the east and west of Yunnan Province are less than those in the valley of the Jinshajiang River basin and in the central region of Yunnan Province.The evaporation capacity in spring and summer is greater than that in autumn and winter.It shows a tendency of reducing for recent 30years.The possible reasons that cause the evaporation capacity wide decreased in1990s are the lessening of sunshine duration and wind speed.