Journal
ATMOSPHERIC ENVIRONMENT
Volume 45, Issue 12, Pages 2060-2066Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2011.01.064
Keywords
Positive artifact; Thermal-optical reflectance; Thermal-optical transmittance; Secondary organic aerosol; Water-soluble organic carbon
Funding
- National Natural Science Foundation of China [20625722]
- National 973 Program of China [2010CB951803]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [2007B57]
Ask authors/readers for more resources
Ambient organic carbon (OC) to elemental carbon (EC) ratios include important information about the extent of secondary organic aerosol (SOA) production. Influences of the measurement methods on the OC to EC ratios were evaluated in Beijing. When analyzed by the IMPROVE-A temperature protocol, the presence of positive artifact would increase the OC to EC ratio by 14-36% based on the transmittance correction, whereas the ratio of the un-denuded filter was 1.12-1.31 times that of denuded filter when using the reflectance correction. The OC to EC ratios calculated by results from the transmittance correction showed more significant variation comparing with those based on the reflectance correction; and no correlation between them was found. SOA concentrations were predicted by the EC-tracer method to investigate effects of the charring correction methods. Estimated SOA based on the reflectance correction was found to be much lower comparing with that calculated by results from the transmittance correction. SOA based on the reflectance correction might be unreliable because it exhibited no correlation with water-soluble organic carbon (WSOC). On the other hand, WSOC and SOA based on the transmittance correction correlated well (R-2 = 0.77-0.94), indicating the secondary nature of WSOC in Beijing. (C) 2011 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available