Sponsor(s): Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences(CAS)
12 issues per year
Current Issue: Issue 01, 2021
Environmental Science is supervised by Chinese Academy of Sciences and sponsored by Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (CAS). Launched in 1976, it is a monthly and international public journal. Its scope covers the latest and significant achievements in basic research and applied research, and the theories and techniques for pollution control, clean production and ecological construction. The journal is included in MEDLINE, CA, AJ, BP, IM, JICST, ZR, CSA, CSTPCD, CNKI and CSCD.
Zhao Jingzhu, Hao Jiming, Tian Gang
Source Apportionment of Ambient Carbonyl Compounds Based on a PMF and Source Tracer Ratio Method: A Case Based on Observations in Nanjing
Environmental Science,2021,Vol 42,No. 01
Ambient carbonyl compounds play an important role in tropospheric atmospheric chemistry. Primary emissions and photochemical formation are both sources of carbonyls, and therefore it is challenging work to analyze their sources. In this study, carbonyl sources were apportioned using the source tracer ratio method (STR) and positive matrix factorization model (PMF) based on offline carbonyls observations at a site in Nanjing during March 2017. Eleven carbonyl compounds were detected, and their total concentrations were in the range of 2.57 × 10 −9–22.83 × 10 −9. Formaldehyde, acetaldehyde, and acetone were the main components, accounting for 36.8%, 21.6%, and 18.5% of the average concentration of eleven carbonyl compounds, respectively. The influences of tracer selection and background concentrations on the results of source apportionment using the STR based on comparing the results of acetylene and toluene as tracers and the 5th and 10th percentiles as background concentrations are presented. Five sources were resolved by PMF, including traffic emission, the petrochemical & chemical industry, paint & solvent use, secondary formation & background, and the chemical industry. Secondary formation & background sources were the largest contributors of carbonyl compounds, contributing 56.4%, 48.2%, and 58.3% to formaldehyde, acetaldehyde, and acetone, respectively. By comparing the carbonyl source apportionment results by STR and PMF, it was found that the STR depends on the selection of tracers. When the STR is applied in the areas with complex sources, it is difficult to use a tracer to indicate anthropogenic source emissions, and therefore it is not a suitable method for carbonyl source apportionment.