基于遥感的秸秆焚烧对江苏省气溶胶光学厚度时空分布的影响研究

发布时间：2018-06-11 21:51

本文选题：秸秆焚烧 + 火点　；参考：《生态环境学报》2017年01期

【摘要】：为了解秸秆焚烧对大气气溶胶光学厚度(AOD)时空分布的影响,利用江苏省2010—2015年卫星监测数据和气象观测数据,计算了5—7月份江苏省的AOD信息,采用基于上下文的增强的火点遥感识别方法提取了6月江苏省的火点信息,分析了AOD与火点的时空变化特征,以期为开展大气环境监测与评价提供依据,为政府秸秆焚烧防控决策提供参考。结果表明:江苏省秸秆焚烧火点主要集中于6月,2010—2013年6月秸秆焚烧火点较多,2014年和2015年的火点数明显减少,且火点主要集中于长江以北地区,而长江以南地区较少;在没有秸秆焚烧的情况下(以5月和7月作为对照),江苏省AOD的空间分布表现为苏南最高,苏中其次,苏北最低;而受秸秆焚烧影响的6月,全省平均AOD值均大于5月和7月,其中江苏西部、苏北、苏南大部分地区AOD值明显增大,AOD高值区跟秸秆焚烧火点高发区分布总体一致;秸秆焚烧对苏南、苏中和苏北的AOD值影响存在一定差异,针对5—6月AOD进行差值计算,发现苏北AOD平均差值为0.19,苏南为0.22,苏中最小,仅为0.11,且苏中部分地区的AOD差值与火点的分布并非完全一致,这是由于6月苏中地区以东到东南风为主,且苏中平原秸秆焚烧排放的污染物更易扩散,导致秸秆焚烧对苏中地区AOD值的影响程度小于苏南和苏北,与火点的分布并不完全一致。可见,秸秆焚烧可对江苏省AOD的时空变化产生较明显的影响。
[Abstract]:In order to understand the influence of straw incineration on the spatial and temporal distribution of atmospheric aerosol optical thickness (AOD), the AOD information of Jiangsu Province in May to July was calculated by using the satellite monitoring data and meteorological observation data from 2010 to 2015 in Jiangsu Province. The fire site information of Jiangsu Province in June was extracted by using context-based enhanced remote sensing recognition method, and the temporal and spatial variation characteristics of AOD and fire point were analyzed in order to provide the basis for atmospheric environment monitoring and evaluation. To provide a reference for the government straw burning prevention and control decision. The results showed that the burning points of straw burning in Jiangsu Province were mainly concentrated in June 2010 to June 2013, and the number of fire points in 2014 and 2015 decreased obviously, and the fire spots were mainly concentrated in the north of the Yangtze River, but less in the south of the Yangtze River. Without straw burning, the spatial distribution of AOD in Jiangsu Province was the highest in southern Jiangsu, followed by the lowest in middle Jiangsu and the lowest in northern Jiangsu, and the average AOD value in June affected by straw burning was higher than that in May and July. The AOD values in the western, northern and southern Jiangsu regions were significantly increased, and the AOD values in the high AOD areas were consistent with those in the high incidence areas of straw incineration, and the effects of straw burning on AOD values in southern Jiangsu, middle Jiangsu and northern Jiangsu were different to some extent. According to the calculation of AOD in May and June, it is found that the average difference of AOD in northern Jiangsu is 0.19, that in southern Jiangsu is 0.22, and that in central Jiangsu is only 0.11, and the AOD difference in some parts of central Jiangsu is not completely consistent with the distribution of fire point. This is due to the fact that in June, the east of the central Jiangsu area to the southeast wind is dominant, and the pollutants emitted from straw burning in the central Jiangsu plain are easier to diffuse, which results in the effect of straw burning on AOD values in the central Jiangsu area is less than that in the south and north of Jiangsu Province. It is not exactly consistent with the distribution of the fire point. Therefore, straw incineration has a significant effect on the temporal and spatial changes of AOD in Jiangsu Province.
【作者单位】：江苏省气象服务中心;池州市气象局;
【基金】：国家自然科学基金项目(41375158) 江苏省气象局青年科研基金项目(Q201507);江苏省气象局重点项目(KZ201403) 江苏省科技支撑计划项目(BE2011840)
【分类号】：X87

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