Xu Yuanqian, Huang Zhijiong, Jia Guanglin, Fan Meng, Cheng Liangxiao, Chen Liangfu, Shao Min, Zheng Junyu
School of Environment and Energy, South China University of Technology, University Town, Guangzhou 510006, PR China.
Institute for Environment and Climate Research, Jinan University, Guangzhou 510000, PR China.
Sci Total Environ. 2019 Jun 25;671:536-547. doi: 10.1016/j.scitotenv.2019.03.199. Epub 2019 Mar 15.
As a major source of secondary organic aerosol, open crop residue burning (OCB) emits a large number of trace gases and particulates to the atmosphere. Extensive OCB is detected during harvest seasons in most regions of China. Emissions from OCB have been widely investigated in China, but few studies have focused on regional discrepancies in spatiotemporal variations with a long timescale. In this study, emissions from OCB in three typical regions of China, including Northeast China, Chengdu-Chongqing and Guangdong, from 2003 to 2016, were estimated using a combination of statistical data and the Moderate Resolution Imaging Spectroradiometer (MODIS) observations, and regional discrepancies in spatiotemporal variations and driving forces were analyzed in detail. The results showed that OCB emissions of CO and PM in 2016 were 3.63 × 10 and 6.96 × 10 tons in Northeast China, 9.77 × 10 and 1.36 × 10 tons in Chengdu-Chongqing, and 1.24 × 10 and 1.19 × 10 tons in Guangdong, respectively. The OCB emissions in Northeast China maintained an overall increasing trend, which were mainly dominated by rural economic development and agricultural modernization, with great potential for reduction. In Chengdu-Chongqing, emissions increased until 2013 and then decreased, due to the impact of policies prohibiting OCB. In Guangdong, emissions showed annual fluctuations with a slightly decreasing trend influenced by metrological conditions and related policies. The analysis of the driving forces behind the regional discrepancies among these typical regions indicated that OCB emissions in China were characterized by uneven rural economic development, control policies, and natural conditions, suggesting that region-dependent control measures are needed for reducing OCB emissions. This study provided a better understanding of OCB emission characteristics in the three typical regions and revealed the diversity of OCB emission characteristics in China.
作为二次有机气溶胶的主要来源，露天农作物秸秆焚烧（OCB）向大气中排放大量痕量气体和颗粒物。在中国大部分地区的收获季节都能检测到大规模的露天农作物秸秆焚烧。中国已对露天农作物秸秆焚烧的排放进行了广泛研究，但很少有研究关注长时间尺度下时空变化的区域差异。在本研究中，利用统计数据和中分辨率成像光谱仪（MODIS）观测数据相结合的方法，估算了2003年至2016年中国三个典型地区（包括东北地区、成渝地区和广东）的露天农作物秸秆焚烧排放量，并详细分析了时空变化的区域差异及其驱动力。结果表明，2016年东北地区露天农作物秸秆焚烧排放的一氧化碳和颗粒物分别为3.63×10吨和6.96×10吨，成渝地区为9.77×10吨和1.36×10吨，广东为1.24×10吨和1.19×10吨。东北地区的露天农作物秸秆焚烧排放量总体呈上升趋势，主要受农村经济发展和农业现代化的影响，减排潜力巨大。在成渝地区，排放量在2013年之前增加，之后减少，这是由于禁止露天农作物秸秆焚烧政策的影响。在广东，排放量受气象条件和相关政策的影响呈现年度波动且略有下降趋势。对这些典型地区区域差异背后驱动力的分析表明，中国露天农作物秸秆焚烧排放具有农村经济发展不平衡、控制政策和自然条件的特点，这表明需要采取因地制宜的控制措施来减少露天农作物秸秆焚烧排放。本研究更好地了解了三个典型地区的露天农作物秸秆焚烧排放特征，揭示了中国露天农作物秸秆焚烧排放特征的多样性。
