绵阳地区近地面气溶胶中7Be和210Pb分布特征及其对O3的示踪

Abstract

Abstract: In order to understand the radiation environmental quality status in the air near the ground in Mianyang,grasp its changing trend,and to explore the source of near surface aerosol and its significance for tracing the concentration of near surface O₃,the aerosol samples were analyzed in detail from Anzhou District,Jiangyou City,Zitong county and Pingwu County of Mianyang city from March 2018 to February 2019.In general,the activity concentration of ⁷Be was higher in spring and autumn,and the lowest level was in summer,with an annual average of 1.90-2.13 mBq/m³,which was basically consistent with the global distribution characteristics of inland,mid latitude and low altitude areas.The annual average of ²¹⁰Pb activity concentration was 1.24-1.66 mBq/m³,which was the relatively high value of ²¹⁰Pb activity concentration on the global land.Through the correlation analysis and P value test of ⁷Be,¹⁰Pb and ⁷Be/²¹⁰Pb ratios in near surface aerosols and O₃,the results show that there is a very significant positive correlation between ⁷Be/²¹⁰Pb ratio and near surface O₃,which can be used as a good tracer for the source of O₃ in the near surface air.The source of O₃ in the near surface air in Zitong and Pingwu counties in Mianyang city is greatly affected by the vertical convection.

Key words: aerosol, ⁷Be, ²¹⁰Pb, distribution characteristics, O₃, tracer

CLC Number:

X831

LIU Yuhang, HUANG Ying, GU Chuan, DU Yuanyuan. Distribution characteristics of ⁷Be and ²¹⁰Pb in near surface aerosolsin Mianyang area and their tracing of O₃[J].RADIATION PROTECTION, 2020, 40(6): 587-592.

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Distribution characteristics of 7Be and 210Pb in near surface aerosolsin Mianyang area and their tracing of O3

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Distribution characteristics of ⁷Be and ²¹⁰Pb in near surface aerosolsin Mianyang area and their tracing of O₃