Characterization of airborne carbonate over a site near Asian dust source regions during spring 2002 and its climatic and environmental significance

摘要

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 (CO3 2~-) fraction was determined by sample acidification and thermal evolution. The CO3 2~- 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.