Document Detail


Key role of organic carbon in the sunlight-enhanced atmospheric aging of soot by O2.
MedLine Citation:
PMID:  23236134     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Soot particles are ubiquitous in the atmosphere and have important climatic and health effects. The aging processes of soot during long-range transport result in variability in its morphology, microstructure, and hygroscopic and optical properties, subsequently leading to the modification of soot's climatic and health effects. In the present study the aging process of soot by molecular O(2) under simulated sunlight irradiation is investigated. Organic carbon components on the surface of soot are found to play a key role in soot aging and are transformed into oxygen-containing organic species including quinones, ketones, aldehydes, lactones, and anhydrides. These oxygen-containing species may become adsorption centers of water and thus enhance the cloud condensation nuclei and ice nuclei activities of soot. Under irradiation of 25 mW·cm(-2), the apparent rate constants (k(1,obs)) for loss or formation of species on soot aged by 20% O(2) were larger by factors of 1.5-3.5 than those on soot aged by 100 ppb O(3). Considering the abundance of O(2) in the troposphere and its higher photoreactivity rate, the photochemical oxidation by O(2) under sunlight irradiation should be a very important aging process for soot.
Authors:
Chong Han; Yongchun Liu; Jinzhu Ma; Hong He
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-12-12
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  109     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-27     Completed Date:  2013-02-21     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  21250-5     Citation Subset:  IM    
Affiliation:
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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MeSH Terms
Descriptor/Qualifier:
Atmosphere / chemistry*
Carbon / chemistry*
Hexanes / chemistry
Kinetics
Organic Chemicals / chemistry*
Oxygen / chemistry*
Soot / chemistry*
Spectrophotometry, Infrared
Sunlight*
Time Factors
Chemical
Reg. No./Substance:
0/Hexanes; 0/Organic Chemicals; 0/Soot; 2DDG612ED8/n-hexane; 7440-44-0/Carbon; 7782-44-7/Oxygen
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