Journal
JOURNAL OF THE ATMOSPHERIC SCIENCES
Volume 70, Issue 6, Pages 1784-1794Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JAS-D-12-0232.1
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Funding
- National Natural Science Foundation of China [41030858]
- National Basic Research Program of China (973 Program) [2010CB428904]
- Changjiang Scholars Programme, Ministry of Education of China
- Taishan Scholars Program of Shandong Province, China
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The total suspended particulate (TSP) samples over the Yellow Sea and the East China Sea were collected to determine themajor compositions of water-soluble ionic species during two cruises in autumn 2007. The aerosol compositions exhibited an obvious regional variation between the two cruises, with higher concentrations (except Na+ and Mg2+) over the northern Yellow Sea during the first cruise. The concentrations of the secondary ions [non-sea salt sulfate (nss-SO42-), NO3-, and NH4+] were 11 +/- 4.9, 3.1 +/- 2.1, and 3.7 +/- 2.6 mu g m(-3), respectively, which together contributed over 72% of the total determined ion concentrations. Significant correlations between these secondary ions were found within each sampling period, while nss-K+ and nss-Ca2+ showed strong correlation with each other. The calculated results of equivalent concentrations of anions (nss-SO42- and NO3-) and cations (NH4+ and Ca2+) showed that the acidic species were mostly neutralized with the alkaline species over the study areas. The mass ratio of nss-SO42-/NO3- was 1.4 during the investigation period. In addition, the concentrations of MSA were 0.011 +/- 0.044 and 0.0081 +/- 0.0047 mu g m(-3) during the two cruises, respectively. Based on the measured MSA, nss-SO42-, and their ratios, the relative biogenic sulfur contribution to the total nss-SO42- was estimated to be only 2.0% during the two cruises, further suggesting the major contribution of anthropogenic source to sulfur budget over the marginal seas of China.
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