近地面气象要素对金沙降水pH值的影响

通过对金沙大气本底站2012年全年140场有效降水的酸雨观测资料和地面气象要素资料进行了分析。结果表明:降水量对降水pH值、强酸性酸雨出现率有着显著影响;风速在4~9月份与降水pH值的变化趋势接近,即降水的pH值随风速的增大而升高;大气压强变化趋势与pH值变化相反,呈负相关;湿度与降水pH值相关性较差,这与金沙地理位置有关;温度与降水pH值呈较好的正相关,特别是4~10月随温度的升高pH值降低。pH值与降水量、温度及大气压强关联,其相关系数依次为0.355、0.406和-0.446。最后本章对各气象因子进行逐步回归分析,得出pH值与各气象因子的回归方程。

Influence of Near-surface Meteorological Factors on the pH Value of Rainfalls in Jinsha Region

In this paper,analysis is performed on the basis of acid rain observation data and ground meteorological factors of 140 effective rainfalls at Jinsha Regional Atmospheric Background Station in 2012.The results indicate that precipitation has a significant influence on the pH value of the rainfalls and the occurrence rate of strong acid rain.The variation trend of wind velocity from April to September is close to that of the pH value of the rainfalls.That is,the pH value rises with the increase of the wind speed.The changing trend of atmospheric pressure is opposite to that of pH value,presenting negative correlation.The relevancy of humidity to pH value is comparatively unfavorable,which is related to the geological location of Jinsha.Correlation between temperature and pH value presents positive and favorable.Especially from April to October,the pH value decreases with the increase of the temperature.Therefore,pH value is related to precipitation,temperature and atmospheric pressure with the correlation coefficients of 0.355,0.406 and-0.446 respectively.Finally,stepwise regression analysis is performed to each meteorological factor and regression equation between pH value and each meteorological factor is obtained.