Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6326
Title: Characterization of airborne carbonate over a site near Asian dust source regions during spring 2002 and its climatic and environmental significance
Authors: Cao, JJ
Lee, SC 
Zhang, XY
Chow, JC
An, ZS
Ho, KF
Watson, JG
Fung, K
Wang, YQ
Shen, ZX
Keywords: Dust storm
Carbonate
Carbon isotope
Asian dust
Atmospheric carbon
Receptor model
Issue Date: Feb-2005
Publisher: Wiley-Blackwell
Source: Journal of geophysical research. Atmospheres, Feb. 2005, v. 110, no. D3, D03203 How to cite?
Journal: Journal of geophysical research. Atmospheres 
Abstract: During spring 2002, three dust storm events were monitored by filter sampling in Xi'an near an Asian dust source region of northwest China. The carbonate (CO [sup 2-] [sub 3]) fraction was determined by sample acidification and thermal evolution. The CO [sup 2-] [sub 3] accounted for 8.0 ± 0.8% of particles with aerodynamic diameter ≤2.5 μm (PM₂.₅) during dust storms and 4.7 ± 3.0% of PM₂.₅ between storms. The ratios of calcium to carbonate carbon were consistent with those of calcite (CaCO₃). The δ¹³C and δ18O abundances in dust storm samples were −2.7 ± 0.7‰ and −5.8 ± 1.5‰, which differed from −8.3 ± 1.9‰ for δ13C and −10.8 ± 2.0‰ for δ¹⁸ O during normal conditions. The δ¹³C is positively correlated with δ¹⁸ O values (r = 0.78). This first measurement of isotopic abundance in Asian dust indicates the potential to quantify its contribution at distant locations using receptor models. By increasing the alkalinity of ocean water in the Pacific Ocean and buffering the atmospheric acidity of east Asia, the large amounts of airborne CO[sup 2-] [sub 3] (as high as 44.8 Tg yr⁻¹) entrained by Asian dust may provide an important atmospheric alkaline carbon reservoir for large-scale climatic and environmental changes. (See Article file for details of the abstract.)
URI: http://hdl.handle.net/10397/6326
ISSN: 2169-897X
EISSN: 2169-8996
DOI: 10.1029/2004JD005244
Rights: Copyright 2005 by the American Geophysical Union.
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