Chemical characteristics of aerosol composition over the yellow sea and the east China sea in autumn

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Date: June 2013
From: Journal of the Atmospheric Sciences(Vol. 70, Issue 6)
Publisher: American Meteorological Society
Document Type: Author abstract
Length: 244 words

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Abstract :

The total suspended particulate (TSP) samples over the Yellow Sea and the East China Sea were collected to determine the major 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.sup.+] and [Mg.sup.2+]) over the northern Yellow Sea during the first cruise. The concentrations of the secondary ions [non-sea salt sulfate (nss-)S[[O.sub.4].sup.-2], N[O.sub.3]- and N[H.sub.4]+] were 11 [+ or -] 4.9, 3.1 [+ or -] 2.1, and 3.7 [+ or -] 2.6 [mu]g [m.sup.-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.sup.+] and nss-[Ca.sup.2+] showed strong correlation with each other. The calculated results of equivalent concentrations of anions (nss-S[[O.sub.4].sup.-2] and N[O.sub.3]-) and cations (N[H.sub.4]+ and [Ca.sup.2+]) showed that the acidic species were mostly neutralized with the alkaline species over the study areas. The mass ratio of nss-S[[O.sub.4].sup.-2]/N[O.sub.3]- was 1.4 during the investigation period. In addition, the concentrations of MSA were 0.011 [+ or -] 0.044 and 0.0081 [+ or -] 0.0047 [mu]g [m.sup.-3] during the two cruises, respectively. Based on the measured MSA, nss-S[[O.sub.4].sup.-2], and their ratios, the relative biogenic sulfur contribution to the total nss-S[[O.sub.4].sup.-2] 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. Keywords: Ship observations, Associate Editor-JAS

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Gale Document Number: GALE|A344646333