Assessing the Effect of the Long-Term Variations in Aerosol Characteristics on Satellite Remote Sensing of PM2.5 Using an Observation-Based Model

Environmental Science & Technology
Changqing LinChengcai Li

Abstract

Variations in aerosol characteristics play an essential role in satellite remote sensing of PM2.5 concentrations. The lack of measurement of aerosol characteristics, however, limits the assessment of their effects. This study presented an observation-based model that directly considered the effects of aerosol characteristics. In this model, we used an integrated humidity coefficient (γ') and an integrated reference value ( K) to delineate the effects of aerosol characteristics. We then investigated the effects of the long-term variations in aerosol characteristics on satellite remote sensing of PM2.5 concentration in Hong Kong from 2004 to 2012. The results show that the γ' value peaked in 2009 because the percentages of highly hygroscopic components (e.g., sulfate and nitrate) in aerosols reached their peaks. The K value increased from 2004 to 2011 because of the increasing percentages of strong light-extinction components (e.g., organic matter) and the decreasing fine mode fraction in aerosols. The accuracy of PM2.5 retrieval improved greatly after accounting for the long-term variations in aerosol characteristics (e.g., correlation coefficient increased from 0.56 to 0.80). The results underscore the need to incorporate the v...Continue Reading

References

Jun 21, 2002·Journal of the Air & Waste Management Association·John G Watson
May 20, 2005·The Science of the Total Environment·K F HoChak K Chan
Jun 2, 2005·Environmental Science & Technology·Yang LiuPetros Koutrakis
Dec 14, 2011·Environmental Science & Technology·Michael BrauerGeorge D Thurston
Jun 6, 2014·Environmental Science & Technology·Zongwei MaYang Liu
Sep 4, 2014·Environmental Science & Technology·B L BoysS W Wang
Oct 25, 2014·Environmental Health Perspectives·Aaron van DonkelaarBrian L Boys
Jan 28, 2017·The Science of the Total Environment·Jiandong WangJiming Hao
Oct 17, 2017·International Journal of Hygiene and Environmental Health·Zilong ZhangXiang Qian Lao
Nov 15, 2017·Occupational and Environmental Medicine·Xiang Qian LaoLy-Yun Chang
Nov 6, 2018·Environmental Health Perspectives·Ta-Chien ChanXiang Qian Lao

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