西宁市大气重金属污染与气象因子分析

Correlation Analysis of Heavy Metal Pollution in the Atmosphere and Meteorological Factors in Xining City

主要收集了西宁市2016年1月至12月5个重金属Pb、Cd、Cr、Hg、As的浓度数据,以及同时间段内的风向、风速、温度和相对湿度4个气象因子的实测数据,通过确定各季节的主要风向结合污染系数玫瑰图,明确了该地区不同季节风向对重金属污染物浓度扩散方向的影响。再利用SPSS22.0统计分析软件对该市重金属数据与同时段的气象中风速、气温、相对湿度的数据进行相关性分析,结果表明,风速对于各个重金属因子浓度的影响均非常显著,之间的相关性较强,可视为大气重金属污染的主要影响因子。

The concentration data of pb, Cd, Cr, Hg and As five heavy metals of Xining city from January to December, 2016 were collected, and the measured data of wind direction, wind speed, temperature and relative humidity in the same time period. The influence of different seasonal winds on diffusion direction of the concentration of heavy metal pollutants in the region was clarified by determining the main wind direction of each season and combining the pollution coefficient rose diagram. Correlation analysis was conducted on the data of heavy metals in the city and the data of wind speed, temperature and relative humidity in the same time period by SPSS22.0. The results show that wind speed was good relativity with heavy metal factors and the effect of wind speed on the concentration of each heavy metal factor was significant. It can be regarded as main influence factors of the heavy metal pollution in the atmosphere.