Source contributions of sulfate aerosol over East Asia estimated by CMAQ-DDM

Syuichi Itahashi, Itsushi Uno, Soontae Kim

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

(Graph Presented) We applied the decoupled direct method (DDM), a sensitivity analysis technique for computing sensitivities accurately and efficiently, to determine the source-receptor relationships of anthropogenic SO 2 emissions to sulfate aerosol over East Asia. We assessed source contributions from East Asia being transported to Oki Island downwind from China and Korea during two air pollution episodes that occurred in July 2005. The contribution from China, particularly that from central eastern China (CEC), was found to dominate the sulfate aerosols. To study these contributions in more detail, CEC was divided into three regions, and the contributions from each region were examined. Source contributions exhibited both temporal and vertical variability, largely due to transport patterns imposed by the Asian summer monsoon. Our results are consistent with backward trajectory analyses. We found that anthropogenic SO 2 emissions from China produce significant quantities of summertime sulfate aerosols downwind of source areas. We used a parametric scaling method for estimating anthropogenic SO 2 emissions in China. Using column amounts of SO 2 derived from satellite data, and relationships between the column amounts of SO 2 and anthropogenic emissions, 2009 emissions were diagnosed. The results showed that 2009 emissions of SO 2 from China were equivalent to 2004 levels.

Original languageEnglish
Pages (from-to)6733-6741
Number of pages9
JournalEnvironmental Science and Technology
Volume46
Issue number12
DOIs
Publication statusPublished - Jun 19 2012

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Aerosols
Sulfates
aerosol
sulfate
Air pollution
Sensitivity analysis
Trajectories
Satellites
sensitivity analysis
Asia
method
satellite data
monsoon
atmospheric pollution
trajectory
summer

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Source contributions of sulfate aerosol over East Asia estimated by CMAQ-DDM. / Itahashi, Syuichi; Uno, Itsushi; Kim, Soontae.

In: Environmental Science and Technology, Vol. 46, No. 12, 19.06.2012, p. 6733-6741.

Research output: Contribution to journalArticle

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