论文部分内容阅读
以2009-2013年每年10月份京津冀平原区的MODIS气溶胶光学厚度数据(AOD)为基础,建立时间序列插值模型,插值得到更加系统完整的AOD日数据;进一步以日数据为基础,运用算术平均值计算方法得到AOD月均值图像,并且提取京津冀平原区10个城市每年10月份的AOD月均值.研究结果表明:就整个研究区而言,在时间变化上,AOD值呈现逐渐增大的趋势,2012年10月达到最大,2013年10月略有减小;在空间分布上,西北部区域AOD值较小,东南部区域AOD值较大.就10个城市而言,在时间变化上,有5个城市AOD值呈现增大趋势,5个城市呈现波动特征;在空间分布上,西部的3个城市为AOD低值城市,东北部的4个城市为中值城市,东南部的3个城市为高值城市.“,”Based on the aerosol optical depth (AOD) of the Beijing-Tianjin-Hebei plain region obtained in October,a time-series interpolation model was developed to achieve more systematic and comprehensive daily AOD from 2009 to 2013.Monthly AOD was determined using the arithmetic mean of the daily values.Moreover,the October AODs of 10 cities were obtained.It was found that,for the whole region,AODs increased until reaching the maximum in October 2012,and then decreased slightly in October 2013.The AODs of the northwestern areas were smaller than they were in the southeastern areas.For the 10 cities,the AODs of 5 of the cities increased,whereas the others fluctuated.The western three cities had lower AODs,whereas the three cities located in the southeast had higher AODs and the four cities located in the northeast had moderate AODs.