珠江口海域大气中重金属季节变化特征及其与气象因子的关系

发布时间：2018-07-10 04:46

  本文选题：大气 + 重金属　； 参考：《海洋通报》2016年06期

【摘要】：利用2013-2015年珠江口海域代表春、夏、秋、冬4个季节的气溶胶质量浓度资料及同期的气象观测数据,分析得出大气中重金属(Cu、Pb、Zn)质量浓度具有秋季最高,冬季次之,春、夏季较低的季节变化特征,这一特征与气象因子及污染来源关系密切。除春季外,夏、秋、冬季,大气中Cu、Pb、Zn之间具有良好的显著相关性,说明大气中赋存Cu、Pb、Zn的颗粒物一部分来源相同。春、夏季,当主导风向为东南向时,气团较清洁,大气污染物浓度低;秋、冬季,当主导风向为偏东向及北风向时,污染物由内陆源及沿海源输送,大气污染物浓度高。气象条件对大气中重金属含量具有重要的影响,且其相关性随季节变化明显。通过SPSS 19.0软件对大气中Cu、Pb、Zn的质量浓度与近地面风速、气温、气压、相对湿度等做曲线回归分析,尝试找出各污染物浓度变化与气象因子的定量关系。结果表明,春、夏季,当气温27℃时,Cu、Pb、Zn的质量浓度与气温呈显著正相关;夏季,Cu、Pb、Zn的质量浓度与气压、相对湿度(90%)呈显著负相关;秋季,Cu、Pb、Zn的质量浓度与风速和相对湿度(65%)具有显著负相关;冬季,当气压在1005.0~1015.0 h Pa范围内,Cu、Pb、Zn的质量浓度与气压呈显著正相关。
[Abstract]:Based on the aerosol mass concentration data of spring, summer, autumn and winter in the Pearl River Estuary from 2013 to 2015 and meteorological observation data of the same period, it is concluded that the mass concentration of heavy metals in the atmosphere is highest in autumn, followed by spring in winter. The lower seasonal variation in summer is closely related to meteorological factors and pollution sources. Except in spring, summer, autumn and winter, there was a good correlation between Cu ~ (2 +) Pb ~ (2 +) Zn in the atmosphere, indicating that some of the particulate matter containing Cu ~ (2 +) Pb ~ (2 +) Zn in the atmosphere were from the same source. In spring and summer, when the dominant wind direction is southeastward, the air mass is cleaner and the concentration of atmospheric pollutants is low. In autumn and winter, when the dominant wind direction is eastward and northerly, the pollutants are transported from inland and coastal sources, and the concentration of atmospheric pollutants is high. The meteorological conditions have an important influence on the heavy metal content in the atmosphere, and the correlation is obvious with the seasons. By using SPSS 19.0 software, the relationship between the mass concentration of Cu PbN Zn in the atmosphere and the near surface wind speed, air temperature, air pressure, relative humidity and so on was analyzed, and the quantitative relationship between the concentration of each pollutant and meteorological factors was found out. The results showed that there was a significant positive correlation between the mass concentration of PbZn and the temperature at 27 鈩，

本文编号：2112110