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合肥梅雨季节大气污染物分布特征的激光雷达探测

Distribution Characteristics of Atmospheric Pollutions in Meiyu Season over Hefei Observed by Using Lidar

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摘要

利用AML-2型车载测污激光雷达测得的合肥梅雨季节大气污染物的监测数据, 研究梅雨季节对流层大气气溶胶和臭氧的时空分布特征, 对比分析雨水对大气污染物消减的影响。结果表明:梅雨季节气溶胶的消光系数较小, 且随着高度增大呈递减的趋势, 在0.5 km高度处, 多天的消光系数为 0.1~0.18 km-1; 持续降水对气溶胶浓度具有显著的消减作用, 梅雨季节之前和梅雨季节气溶胶消光系数的均值分别为0.37 km-1和0.14 km-1; 梅雨季节臭氧的时空变化特征明显, 臭氧浓度随高度的增大而逐渐减小, 臭氧浓度的日差异较大, 2008年6月20日和24日, 0.4 km高度处臭氧质量浓度相差59.5 μg/m3; 与梅雨季节之前相比, 梅雨季节的臭氧浓度大幅减小, 相同高度处臭氧质量浓度均值的差值可达41.8 μg/m3。

Abstract

By analyzing monitoring data of atmospheric pollutions in Meiyu season measured by AML-2 mobile lidar, we study the temporal and spatial distribution characteristics of aerosol and ozone in troposphere over Hefei in Meiyu season, and analyze the effect of precipitation on pollution reduction. The results show that the aerosol extinction coefficient is small in Meiyu season and decreases with the increase of altitude on the whole. At 0.5 km, the extinction coefficient is from 0.1 km-1 to 0.18 km-1 in multiple days in Meiyu season. Continuous precipitation plays a significant role in reducing aerosol concentration, the mean aerosol extinction coefficient before Meiyu season and in Meiyu season is 0.37 km-1 and 0.14 km-1, respectively. The temporal and spatial variation characteristics of ozone are obvious in Meiyu season. The ozone concentration decreases with the increase of altitude and shows large daily variation. In June 20 and 24, 2008, the difference of mass concentration of ozone at 0.4 km is about 59.5 μg/m3. Compared with concentration of ozone before Meiyu season, the concentration in Meiyu season is greatly reduced with the maximum difference up to 41.8 μg/m3 at the same height.

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中图分类号:TN958.98

DOI:10.3788/cjl201946.0110003

所属栏目:遥感与传感器

基金项目:中国科学技术大学预研项目(YZ208000033)、国家基金委重大仪器专项(41127901)

收稿日期:2018-07-10

修改稿日期:2018-08-10

网络出版日期:2018-09-26

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方欣:中国科学技术大学中国科学院近地空间环境重点实验室, 安徽 合肥 230026中国科学技术大学地球和空间科学学院安徽蒙城地球物理国家野外科学观测研究站, 安徽 合肥 230026
王敏:安徽省大气探测技术保障中心, 安徽 合肥 230031
胡顺星:中国科学院安徽光学精密机械研究所, 安徽 合肥 230031

联系人作者:方欣(xinf@ustc.edu.cn)

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引用该论文

Fang Xin,Wang Min,Hu Shunxing. Distribution Characteristics of Atmospheric Pollutions in Meiyu Season over Hefei Observed by Using Lidar[J]. Chinese Journal of Lasers, 2019, 46(1): 0110003

方欣,王敏,胡顺星. 合肥梅雨季节大气污染物分布特征的激光雷达探测[J]. 中国激光, 2019, 46(1): 0110003

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