期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 90, 期 11, 页码 3231-3244出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2009.04.021
关键词
Visibility; Light-extinction budget; Aerosol water content; Optical property; Radiative forcing
资金
- Korea government (MEST) [R17-2008-042-01001-0]
- Gwangju Institute of Science and Technology
- China National Basic Research and Development Program [2002CB410801]
- National Research Foundation of Korea [R17-2008-042-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Optical and chemical aerosol measurements were obtained from 2 to 31 July 2006 at an urban site in the metropolitan area of Guangzhou (China) as part of the Program of Regional Integrated Experiment of Air Quality over Pearl River Delta (PRIDE-PRD2006) to investigate aerosol chemistry and the effect of aerosol water content on visibility impairment and radiative forcing. During the PRIDE-PRD2006 campaign, the average contributions of ammonium sulfate, organic mass by carbon (OMC), elemental carbon (EC), and sea salt (SS) to total PM2.5 mass were measured to be 36.5%, 5.7%, 27.1%, 7.8%, and 3.7%. respectively. Compared with the clean marine period, (NH4)(2)SO4, NH4NO3, and OMC were all greatly enhanced (by up to 430%) during local haze periods via the accumulation of a secondary aerosol component. The OMC dominance increased when high levels of biomass burning influenced the measurement site while (NH4)(2)SO4 and OMC did when both biomass burning and industrial emissions influenced it. The effect of aerosol water content on the total light-extinction coefficient was estimated to be 34.2%, of which 25.8% was due to aerosol water in (NH4)(2)SO4, 5.1% that in NH4NO3, and 3.3% that in SS. The average mass-scattering efficiency (MSE) of PM10 particles was determined to be 2.2 +/- 0.6 and 4.6 +/- 1.7 m(2) g(-1) under dry (RH < 40%) and ambient conditions, respectively. The average single-scattering albedo (SSA) was 0.80 +/- 0.08 and 0.90 +/- 0.04 under dry and ambient conditions, respectively. Not only are the extinction and scattering coefficients greatly enhanced by aerosol water content, but MSE and SSA are also highly sensitive. It can be concluded that sulfate and carbonaceous aerosol, as well as aerosol water content, play important roles in the processes that determine visibility impairment and radiative forcing in the ambient atmosphere of the Guangzhou urban area. (C) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据