Multi-Scale Observations of Atmosphere Environment and Aerosol Properties over North China during APEC Meeting Periods

Atmosphere

Xi Wei¹  Xingfa Gu¹  Hao Chen¹  Tianhai Cheng¹  Ying Wang¹  Hong Guo¹  Fangwen Bao¹  Kunsheng Xiang¹ 

[1] State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100101, China;

关键词: APEC;    atmosphere environment;    aerosol;    optical properties;    meteorological condition;    satellite data;   

DOI  :  10.3390/atmos7010004

来源: mdpi

【 摘 要 】

This paper reveals a study on air pollution process over North China, applying remote sensing technology, using satellite observation and in situ measurements during the twenty-first Asia-Pacific Economic Cooperation (APEC) meeting, which was held in Beijing between 6 and 12 November when the clear weather was called “APEC-Blue”. In the meantime, pollutants concentrations including PM_2.5 and PM₁₀ in Beijing were lower than 100 μg/m³ owing to the effective government measures and policies, as well as meteorological conditions. High aerosol loading (AOD > 1) was observed over south of Beijing and vertical observations showed that the pollutants were prominent near the land surface. Different from the meeting period, high pollutants concentrations with explosive growth (the values of PM_2.5 and PM₁₀ peaking at 291 μg/m³ and 360 μg/m³ respectively) appeared over Beijing after the meeting period, accompanied by strong temperature inversion and high Relative Humidity (RH) values. The pollution particles transferred from Beijing area to south part of North China. Otherwise, fine-mode particles with strong absorption characteristic (UVAI > 1.5, AOD > 1) covered the Beijing sky in the meantime, indicating the existence of black carbon aerosols.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.