摘要
基于2016年MODIS L2与Landsat 8 OLI遥感影像数据,通过暗像元算法反演获取气溶胶光学厚度(AOD)数据以及目视解译获取土地分类数据,采用回归分析及相关性分析对中原城市群气溶胶的时空分布以及城市化程度对其影响的规律进行研究。结果显示,研究区AOD季节分布特征显著,平均值表现为春季(0.652)>秋季(0.461)>夏季(0.456)>冬季(0.321),以太行山南麓、伏牛山东麓、桐柏山北麓为分界线呈现东高西低的空间分布态势。建设用地面积与年度AOD均值具有显著正相关关系,相关系数为0.467(F=325.090,P=0.000),其中秋季AOD受建设用地面积影响最大,冬季最小。在中原城市群尺度上,以10 km×10 km为最小样方单元,当建设用地面积占比在1.03%~3.05%区间,建设用地面积的增加导致AOD的极显著增加,相关系数为0.369(F=30.364,P=0.000);在11.17%~74.49%区间,建设用地面积的增加导致AOD的显著增加,相关系数为0.143(F=0.020,P=0.029),且在1.03%~3.05%区间幂函数模型拟合度最优,在1.17%~74.49%区间线性模型拟合度最优;在0%~1.02%区间,建设用地面积的增加对春季AOD的增加影响显著;在1.03%~3.05%、11.17%~74.49%区间,建设用地面积增加对冬季AOD增加影响极显著;而在3.06%~6.01%、6.02%~11.16%区间,建设用地面积的增加仅对夏季AOD增加产生影响。中原城市群尺度上,建筑用地占比空间分异在不同程度上影响不同季节AOD空间分布特征,城市群东部平原西部山地丘陵的自然地势在一定程度上影响AOD的分布。
Aerosol optical depth （AOD） was calculated from 2016 MODIS L2 data using a dark pixel algorithm, while LANDSAT 8images were used for land use classification by visual interpretation. The effect of urbanization on the spatio-temporal distribution ofaerosols in Zhongyuan metropolitan area was analyzed. The results showed that the AOD data was obviously different from season toseason. Mean AOD was largest in spring （0.652）, followed by autumn （0.461）, summer （0.456）, and winter （0.321）. Taking the southside of Taihang Mountain, the east side of Funiu Mountain and North side of Tongbai mountain as the dividing line, the spatialdistribution of AOD decreased from east to west. The area of construction land was positively correlated with mean annual AOD（correlation coefficient=0.467, F=325.090, P=0.000）. Variation in AOD was highest in autumn and lowest in winter. 10 km×10 kmwas the smallest quadrat unit for the Zhongyuan metropolitan area. When the proportion of construction land area was1.03%-3.05%,the relationship between construction land area and AOD was significantly positive （correlation coefficient=0.369, F=30.364,P=0.000）, and the power function model had the best goodness of fit. However, when the proportion of construction land area was11.17%-74.49%, it had a weaker positive correlation with AOD （correlation coefficient=0.143, F=0.020, P=0.029）, and the linearmodel had the best goodness of fit. When the proportion of construction land area was 0%-1.02%, it had a significant positivecorrelation with spring AOD. When it was 1.03%~3.05% and 11.17%~74.49%, construction land area had a significant positivecorrelation with winter AOD. As for the range 3.06%-11.16%, construction land area had a significant positive correlation withsummer AOD. In summary, the seasonal spatial distribution of AOD was affected by the degree of urbanization and by the naturaltopography of the study area, from west mountains to the eastern plain.
出处
《生态环境学报》
CSCD
北大核心
2017年第11期1924-1934,共11页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(31600579)
河南省科技攻关项目(162102310093)
河南农业大学博士科研启动项目(30600407)
关键词
城市化
气溶胶光学厚度
时空分异
MODIS
中原城市群
urbanization
aerosol optical depth
spatio-temporal distribution
MODIS
Zhongyuan metropolitan area
