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研究报告

Comparative analysis on the correlation between aerosol optical depth and PM_2.5 mass concentration in Nanjing and Beijing

摘要：利用南京与北京地区2014年5月1日—2019年10月31日的PM_2.5监测数据、气溶胶光学厚度观测资料以及同期MICAPS地面气象要素的观测资料，对两地PM_2.5浓度的变化规律及其与气溶胶光学厚度、气象要素的关系进行了分析和讨论，结果表明：南京与北京均呈现PM_2.5浓度冬季显著高于夏季，AOD冬季小于夏季的特征；对比而言，北京PM_2.5月均浓度高于南京地区；南京与北京的PM_2.5浓度与AOD均为正相关关系，PM_2.5浓度与AOD间相关性存在显著的季节差异，主要表现为夏季相关性大于冬季相关性；两地AOD与PM_2.5浓度均为正相关关系，在同一AOD水平下，相对湿度越大，PM_2.5浓度越大，气溶胶吸湿增长易造成污染物积累；南京PM_2.5浓度与能见度的r为0.57，而北京的r为0.83，两地的PM_2.5浓度与能见度的冬季相关性较夏季好，在高相对湿度下，同一PM_2.5浓度水平时，南京能见度较北京好.

Abstract：Based on the observational data of PM_2.5 mass concentration, aerosol optical depth(AOD) data and meteorological elements from MICAPS data in Nanjing and Beijing, during May 1,2014— October 31,2019, the variations of PM_2.5 mass concentration in two cities and its relationship with AOD, meteorological factors were analyzed and discussed. The results show that the PM_2.5 mass concentrations were significantly higher in winter than summer while the AOD was higher in winter than summer in both Nanjing and Beijing, while, monthly PM_2.5 mass concentration in Beijing was higher than that in Nanjing. The PM_2.5 mass concentration in Nanjing and Beijing was positively correlated with AOD, and there were significant seasonal differences in the correlation between PM_2.5 mass concentration and AOD, with better correlation in summer than in winter. The PM_2.5 mass concentration increases with the relative humidity for the same AOD, as aerosol hygroscopic growth cause pollutant accumulation. The r of PM_2.5 mass concentration and visibility in Nanjing was 0.57, while that in Beijing was 0.83. The correlation between PM_2.5 and visibility was better in winter than in summer in both cities, while, the visibility in Nanjing was better than Beijing for the same PM_2.5 mass concentration level under high relative humidity.