摘要
气溶胶光学厚度(AOD)是气溶胶特性的一个重要指标,现有研究对长三角区域内部AOD变化趋势探讨较少。该文基于2000-2020年多角度大气校正(MAIAC)AOD数据,采用变异系数和Mann-Kendall法分析了长三角地区AOD空间和时间变化趋势。研究结果表明:(1)MAIAC AOD在长三角地区具有较好的适用性,与监测数据相关系数为0.863,均方差为0.218,有58%的数据落在期望误差范围内。(2)AOD呈现北高南低、西高东低的空间格局,北强南弱、东强西弱的空间变化特征。春季为北高南低、夏季为东北高西南低、秋季为除江苏徐州外,其他地区值均比较低和冬季为西北高东南低的分布格局。(3)以2017年为转折点,AOD呈现先增后减波动趋势,且2000-2017年AOD属于波动式上升。空间差异呈现较弱波动性,总体表现为先增后减的趋势。(4)内部各省AOD由高到低分别为江苏省(0.55±0.07)、安徽省(0.51±0.07)、上海市(0.47±0.06)和浙江省(0.43±0.05)。总体均以2017年为转折点,表现出先增后减的变化趋势,各省份变化趋势并不完全相同。
Aerosol Optical Depth(AOD)is an important indicator of aerosol characteristics.There are few studies on AOD in the Yangtze River Delta.Based on the multi-angle atmospheric correction(MAIAC)AOD data from 2000 to 2020,the spatial and temporal variation trends of AOD in the Yangtze River Delta region were analyzed by using variation coefficient and Mann-Kendall method.Results show that MAIAC AOD has good applicability in the region,and the correlation coefficient and mean square error of MAIAC AOD with monitoring data are 0.863 and 0.218,with 58%of data falling within the expected error range.There is the spatial pattern of AOD that is higher in the north and lower in the south,higher in the west and lower in the east.There is the spatial variation of AOD that is stronger in the north and weaker in the south and stronger in the east and weaker in the west.There is the seasonal distribution patterns that are high in north and low in south in spring,high in northeast and low in southwest in summer,low in autumn except Xuzhou,and high in northwest and low in southeast in winter.As the turning point in 2017,AOD shows a fluctuating trend of first increase and then decrease,and a fluctuating increase from 2000 to 2017.The spatial difference shows weak fluctuation,with an overall trend of first increase and then decrease.The AOD of the province of Jiangsu,Anhui,Shanghai and Zhejiang are(0.55±0.07),(0.51±0.07),(0.47±0.06)and(0.43±0.05),respectively.As the turning point in 2017,all of them show a trend of first increase and then decrease,and the trend of each province was not completely the same.
作者
王细元
吉婷婷
王月香
贺巧宁
WANG Xiyuan;JI Tingting;WANG Yuexiang;HE Qiaoning(School of Urban and Environmental Science,Huaiyin Normal University,Huai’an 223300,China;Jiangsu Provincial Engineering Research Center for Intelligent Monitoring and Ecological Management of Pond and Reservoir Water Environment,Huai’an 223300,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2023年第2期118-125,共8页
Environmental Science & Technology
基金
江苏省高校哲学社会科学研究项目:江苏省PM_(2.5)污染时空格局及社会影响因素研究(2021SJA1781)
淮安市自然科学研究计划(指导性)项目:淮安市近20年来PM_(2.5)浓度空间热点及变化研究(HABZ202024)
