Agricultural Fires and Their Potential Impacts on Regional Air Quality over China

Received: October 10, 2013
Revised: January 11, 2013
Accepted: January 11, 2013
Download Citation: RIS|BibTeX|https://doi.org/10.4209/aaqr.2012.10.0277  

Cite this article:
Zha, S., Zhang, S., Cheng, T., Chen, J., Huang, G., Li, X. and Wang, Q. (2013). Agricultural Fires and Their Potential Impacts on Regional Air Quality over China. Aerosol Air Qual. Res. 13: 992-1001. https://doi.org/10.4209/aaqr.2012.10.0277

ABSTRACT

The potential impacts of agricultural fires (agri-fires) on regional air quality over China were examined using active fire products derived from satellite remote sensing and air mass trajectory modeling from 2009 to 2010. Agri-fires were found in most administrative areas. More than 80% of the agri-fires were in the heartlands of agricultural regions such as Anhui, Jiangsu, Shandong and Henan Provinces. Agri-fires had a seasonal pattern, with two distinct peaks in summer and autumn harvest periods, especially in June (61–86%) and October (5–14%). Agri-fire smoke was transported in the atmosphere on a continental scale in three directions, moving northeasterly, northwesterly and southwesterly away from source areas. Particles from agri-fire smoke contributed more than 35% of aerosol optical depth (AOD) over regions of the Jiaodong Peninsular, the North Plain, East China and other areas, and exceeded 60% in some areas of Shandong, Henan and Jiangsu Provinces. In the boundary layer atmosphere, particles from agri-fire smoke contributed more than 29% of PM₁₀ in parts of Anhui, Jiangsu and Shandong Provinces. Due to agri-fires the amount of PM₁₀ was highly correlated (R² = 0.6) with the smoke air masses in the main potential sink regions, and the mean PM₁₀ during the summer harvest of 2010 reached 0.24 mg/m³, far higher than the adjacent periods without smoke.

Keywords: Smoke; Air quality; Transport; Agricultural fire