Crop residue burning in China (2019-2021): Spatiotemporal patterns, environmental impact, and emission dynamics  

作　　者：Qiancheng Lv Zeyu Yang Ziyue Chen Manchun Li Bingbo Gao Jing Yang Xiao Chen Bing Xu 

机构地区：[1]Faculty of Geographical Science,Beijing Normal University,Beijing,100875,China [2]School of Geography and Ocean Science,Nanjing University,Nanjing,210023,China [3]College of Land Science and Technology,China Agriculture University,Beijing,100083,China [4]Department of Earth System Science,Tsinghua University,Beijing,100084,China

出　　处：《Environmental Science and Ecotechnology》2024年第5期158-167,共10页环境科学与生态技术（英文）

基　　金：supported by the Open Research Program of the International Research Center of Big Data for Sustainable Development Goals(Grant No.CBAS2022ORP02);the National Natural Science Foundation of China(Grant No.42171399).

摘　　要：Crop residue burning(CRB)is a major contributor to air pollution in China.Current fire detection methods,however,are limited by either temporal resolution or accuracy,hindering the analysis of CRB's diurnal characteristics.Here we explore the diurnal spatiotemporal patterns and environmental impacts of CRB in China from 2019 to 2021 using the recently released NSMC-Himawari-8 hourly fire product.Our analysis identifies a decreasing directionality in CRB distribution in the Northeast and a notable southward shift of the CRB center,especially in winter,averaging an annual southward movement of 7.5.Additionally,we observe a pronounced skewed distribution in daily CRB,predominantly between 17:00 and 20:00.Notably,nighttime CRB in China for the years 2019,2020,and 2021 accounted for 51.9%,48.5%,and 38.0%respectively,underscoring its significant environmental impact.The study further quantifies the hourly emissions from CRB in China over this period,with total emissions of CO,PM10,and PM_(2.5) amounting to 12,236,2,530,and 2,258 Gg,respectively.Our findings also reveal variable lag effects of CRB on regional air quality and pollutants across different seasons,with the strongest impacts in spring and more immediate effects in late autumn.This research provides valuable insights for the regulation and control of diurnal CRB before and after large-scale agricultural activities in China,as well as the associated haze and other pollution weather conditions it causes.

关 键 词：Crop residue burning Atmospheric pollutants NSMC-Himawari-8 Lagging effects 

分 类 号：X51[环境科学与工程—环境工程]