| Aerosol chemistry and the effect of aerosol water content on visibility impairment and radiative forcing in Guangzhou during the 2006 Pearl River Delta campaign. | |
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MedLine Citation:
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PMID: 19523748 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 PM(2.5) mass were measured to be 36.5%, 5.7%, 27.1%, 7.8%, and 3.7%, respectively. Compared with the clean marine period, (NH(4))(2)SO(4), NH(4)NO(3), 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 (NH(4))(2)SO(4) 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 (NH(4))(2)SO(4), 5.1% that in NH(4)NO(3), and 3.3% that in SS. The average mass-scattering efficiency (MSE) of PM(10) particles was determined to be 2.2+/-0.6 and 4.6+/-1.7m(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. |
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Authors:
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Jinsang Jung; Hanlim Lee; Young J Kim; Xingang Liu; Yuanhang Zhang; Jianwei Gu; Shaojia Fan |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-06-12 |
Journal Detail:
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Title: Journal of environmental management Volume: 90 ISSN: 1095-8630 ISO Abbreviation: J. Environ. Manage. Publication Date: 2009 Aug |
Date Detail:
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Created Date: 2009-08-31 Completed Date: 2009-11-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401664 Medline TA: J Environ Manage Country: England |
Other Details:
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Languages: eng Pagination: 3231-44 Citation Subset: IM |
Affiliation:
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Advanced Environmental Monitoring Research Center (ADEMRC), Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryongdong Bukku, Gwangju 500-712, Republic of Korea. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aerosols
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analysis* Air Pollutants / analysis* Algorithms Ammonium Sulfate / chemistry China Environmental Monitoring / methods* Nitrates / chemistry Particle Size Particulate Matter / analysis Water Pollutants, Chemical / analysis* |
| Chemical | |
Reg. No./Substance:
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0/Aerosols; 0/Air Pollutants; 0/Nitrates; 0/Particulate Matter; 0/Water Pollutants, Chemical; 6484-52-2/ammonium nitrate; 7783-20-2/Ammonium Sulfate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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