豫西地区一次大气污染过程对参考作物腾发量的影响——以洛阳市为例

Influence of an Air Pollution Process on Reference Crop Evapotranspiration in Western Henan:a Case Study of Luoyang

综合分析了2016年6月15日20时-6月20日8时豫西地区一次大气污染过程中,洛阳市各气象要素及参考作物腾发量ET0受气溶胶影响的变化,使用WRF-Chem双向反馈试验量化,并通过气象观测数据验证模拟结果精度,从而进一步分析了气溶胶对ET0的影响及其机理。研究结果表明:在这次大气污染过程中,洛阳市区的PM2.5浓度整体偏高,峰值多出现早晨与傍晚时分,洛阳市东北地区PM2.5浓度整体高于西南地区;气溶胶存在使洛阳市各气象要素发生了变化,进而导致了ET0的变化,各站点ΔET0在-0.23~0.33 mm/d之间;受气溶胶的影响,ET0-d变化幅度在-0.26~0.04 mm/d,较ET0-n的变化程度(-0.08~0.02 mm/d)更大;各站点空气动力项ET0-A的变化程度要大于辐射项ET0-R,这也主导了洛阳市各地区ET0的变化。

This paper comprehensively analyzes the changes of meteorological elements and reference crop evapotranspiration (ET0) under the influence of aerosol in Luoyang during an air pollution process in western Henan from 20∶00 on June 15 to 8∶00 on June 20,2016.WRF-Chem bidirectional feedback test is used to quantify the changes,and the accuracy of simulation results is verified by meteorological observation data,so as to further analyze the influence of aerosol on ET0and its mechanism.The research findings show that in this process of air pollution,the PM2.5concentration in Luoyang is generally high,and that the peaks mostly occur in the morning and evening.The PM2.5concentration in the northeast of Luoyang is generally higher than that in the southwest.The presence of aerosol changes various meteorologi‐cal elements in Luoyang,which leads to the change of ET0,and theΔET0of each site is between -0.23~0.33 mm/d.Affected by aerosol,the variation range of ET0-dis-0.26~0.04 mm/d,which is more than that of ET0-n(-0.08~0.02 mm/d).The variation of the aerodynamic term(ET0-A) at each site is more than the radiation term (ET0-R),which also dominates the variation of ET0in various parts of Luoyang.