【摘要】 利用河西走廊20个气象观测站1958~2005年20 cm口径蒸发皿资料,分析河西走廊蒸发量的气候变化趋势。结果表明:近48年来河西走廊蒸发量年代际平均值在20世纪60年代最大,之后逐渐减小,至80年代初达最小值,80年代中期开始转为上升,从目前演变趋势看,其值仍处于上升阶段;月平均蒸发量分布规律表现为单峰型分布,最大值出现在5月,最小值出现在1月;季节蒸发量的大小排列依次为:夏季>春季>秋季>冬季;蒸发量与气温的相关系数最大,与风速和湿度的相关系数最小,充分说明河西走廊的气温对蒸发量的影响程度远远超过其它因子。更多还原

【Abstract】 Based on 20 cm evaporating dish data from 20 meteorological stations over Hexi Corridor during the period from 1958 to 2005,the climatic changing trend of the evaporation capacity was analyzed.The results showed that in recent 48 years,the decadal quarterly average evaporation capacity in the early 1960s was the largest,then gradually declined and reached the smallest value at the beginning of 1980s,It began to rise in the mid-1980s,in light of the changing tendency,the value is in the ascending stage at present.The regularity of distribution of average monthly evaporation presents a single peak pattern,the largest value is in May,and the smallest value is in Jan..Seasonal evaporation capacity is in a sequence of summer>spring>autumn>winter.The correlation coefficient is the biggest between evaporation and temperature,the value is 0.897,and is the smallest between evaporation and wind speed and humidity.This fully indicates that the effect of temperature on evaporation greatly exceeds that of other factors over Hexi Corridor.更多还原