Abstract
ABSTRACTAgricultural fire is an important source of atmospheric carbonaceous aerosols. To better understand biomass burning emission originating from fire over Asian agriculture areas and its transport into the downwind atmosphere, aerosols and major trace gases were measured continuously from 22 May to 30 June at Shanghai during the summer harvesttime of 2009. Water-soluble K material contained in aerosols showed a clear day-to-day pattern with an average of 1.25 ± 1.48 µg/m3. K ion loading and ratio of K ion to PM10 drastically increased during ‘K event’ days, accompanying with high PM10, SO2, and NO2 levels. MODIS remote sensing fire map revealed about 80% agricultural fires occurred in the agriculture areas of Anhui, Jiangsu, Shandong and Henan provinces. Four potential source areas of agricultural fires, identified as Shanghai, Zhejiang, Jiangsu and Anhui provinces, had significant contributions to worsen the air quality of Shanghai during the harvest season.
Highlights
Smoke aerosols contain a large amount of partially oxidized organic material and black carbon (BC) or soot, which may have significant climate implications (IPCC, 2007)
The purpose of this paper is to report agricultural fire impacts on the air quality of Shanghai using satellite remote sensing fire site data, and to determine the potential source contribution through tracing major outflow pathways
Variation of Air Quality It was known that water-soluble K ion is a proper indicator to be used in estimating biomass burning emission and tracing carbonaceous aerosol long-range transport in the atmosphere (Chow, 1995)
Summary
Smoke aerosols contain a large amount of partially oxidized organic material and black carbon (BC) or soot, which may have significant climate implications (IPCC, 2007). Second only to CO2, in terms of direct climate forcing, BC is believed to be a principal component of global warming through absorption of solar radiation since its warming effect has been found to balance the net cooling effect of other anthropogenic aerosol constituents (Jacobson, 2001). Smoke aerosols originating from urban and industrial pollutions or some from wildfires have been shown to affect cloud microphysics, cloud reflection of sunlight to space, and the onset of precipitation (Andreae et al, 2004). Delays in the onset of precipitation can increase cloud lifetime and thereby increase cloud cover (Resenfeld et al, 2008).
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