辽宁省潜在蒸散量演变规律及归因分析

根据辽宁省21个气象站点1965—2017年的逐日实测气象数据,利用Penman-Monteith法、小波分析法、敏感系数和因子分析法探究潜在蒸散量的时空变异规律及其主要气象要素多年变化定量分析。结果表明:(1)从变化趋势来看,在时间尺度上,辽宁省潜在蒸散量下降趋势显著,变化率为2.89 mm/a,多年平均值为955.82 mm,21个气象站点中有20个气象站点潜在蒸散量呈递减趋势,仅有1个气象站点呈递增趋势;在空间尺度上,辽宁省潜在蒸散量由西向东呈递减趋势。(2)潜在蒸散量对相对湿度最为敏感,对最低气温敏感性最小。(3)平均风速是对潜在蒸散量影响最大的气象因子,相对湿度与潜在蒸散量呈负相关。

Evolution law and attribution analysis of potential evapotranspiration in Liaoning Province

Based on daily meteorological data from 21 meteorological stations in Liaoning Province from 1965 to 2017, Penman-Monteith method, wavelet analysis method, sensitivity coefficient and factor analysis method were used to explore the spatiotemporal variation of potential evapotranspiration and the quantitative analysis of its main meteorological elements. The results show that: (1) from the perspective of the temporal change, the potential evapotranspiration in Liaoning Province has a significant downward trend, with a change rate of 2.89 mm/a and a multi-year average of 955.82 mm. The potential evapotranspiration of the 20 meteorological station has been decreasing, but that of one meteorological station has been increasing. On the spatial scale, the potential evapotranspiration of Liaoning Province decreased from west to east. (2) The potential evapotranspiration is most sensitive to relative humidity and least sensitive to minimum temperature. (3) The average wind speed is the meteorological factor that has the greatest influence on the potential evapotranspiration, and the relative humidity has a negative correlation with the potential evapotranspiration.