2006-2016年河南省气溶胶光学厚度时空分布

摘要

选择近11 a(2006-2016年)Aqua MODIS 3 km气溶胶光学厚度(AOD)产品进行数据提取、空间校正、拼接裁剪和重采样等预处理,得到河南区域资料,在此基础上研究河南省气溶胶光学厚度时空分布特征.结果表明:近11a河南省平均AOD值在0.586 ～0.619之间波动,2007年AOD值最高,2007年之后呈波动下降趋势,年均下降0.001 5;AOD季节平均值夏季最大、春季次之、冬季最小;四个季节AOD近11a均呈波动下降趋势,其中夏季年际变化幅度最大、春秋次之,冬季年际波动幅度较小;南海夏季季风指数对夏、秋两季的AOD波动有明显影响,其中2006-2011年,季风指数和AOD变化趋势相反,而2011-2016年两者变化趋势一致;AOD月均值呈中间高、两边低的周期性变化;河南省AOD年均值空间分布呈北高南低、东高西低的分布形态,高值区主要位于黄河沿岸的三角形区域内,春季、夏季和秋季AOD分布形态与年均值类似,而冬季高值区主要分布在东南部;近11a全省AOD年均值变化在北部、东部、东南部地区以增加为主,其余地区以减小为主;2011-2016年变化以减小为主,仅北部新乡、安阳、濮阳等地增加.%To study the spatial-temporal distribution characteristics of aerosol optical depth (AOD) over He'nan Province,the AOD product with 3 km resolution during 2006-2016 from Aqua MODIS was pretreated including data extraction,spatial correction,splice cutting and resampling,and the AOD values over He'nan region were obtained,on this basis,the spatial and temporal distribution characteristics of average AOD in He'nan were analyzed.The results show that the annual average AOD almost ranged from 0.586 to 0.619,and reached the peak in 2007,then fluctuated downward with a slope of-0.001 5 peryear.The seasonal variation of the AOD average value fluctuated downward,which showed the largest change range in summer,second in spring and the smallest in winter.South China Sea summer monsoonindex (SCSSMI) had significant influence on AOD inter-annual variability,SCSSMI showed an opposite trend during 2006-2011 and consistent trend during 2011-2016 compared with AOD.The monthly variation of AOD value showed the periodic fluctuation with higher value in the middle and lower value in both sides.As for spatial distribution,the multiyear average AOD values were higher in northern and eastern parts and lower in southern and western parts of He'nan Province,the highest AOD value mainly distributed in a triangular area along the Yellow River.The spatial distribution characteristics of mean AOD in spring,summer and autumn were similar to those of annual average values,while the higher value mainly distributed in southeast part of He'nan Province in winter.The change rate in recent 11 years showed increasing in the northern,eastern and southeast parts of He'nan Province,while it showed decreasing in rest parts.The change rate showed increasing only in Xinxiang,Anyang and Puyang in northern part of He'nan Province,while it showed decreasing from 2011 to 2016 in rest parts.