秦岭山地对气溶胶的生态屏障效应  

The eco-barrier effect of Qinling Mountain on aerosols

作　　者：孟清 白红英[1,2] 赵婷[1,2] 郭少壮[1,2] 齐贵增 MENG Qing;BAI Hongying;ZHAO Ting;GUO Shaozhuang;QI Guizeng(College of Urban and Environmental Science, Northwest University, Xi’an 710127, China;Key Laboratory of Surface System and Environmental carrying Capacity of Shaanxi Province, Northwest University, Xi’an 710127, China)

机构地区：[1]西北大学城市与环境学院,西安710127 [2]西北大学陕西省地表系统与环境承载力重点实验室,西安710127

出　　处：《国土资源遥感》2021年第1期240-248,共9页Remote Sensing for Land & Resources

基　　金：国家林业公益性行业科研专项“秦岭天然林对气候变化的时空响应及管理对策”(编号:201304309)资助。

摘　　要：基于2002年1月至2017年12月间的Terra/MODIS MOD04_3k气溶胶光学厚度(aerosol optical depth,AOD)产品,通过空间分析法和核密度估计法分析了秦岭山地对AOD的生态屏障作用及气溶胶与地形的关系。结果表明:①秦岭山地对大气气溶胶的生态屏障作用明显。16 a来秦岭北麓年均AOD值均高于秦岭南麓,高值中心均出现在秦岭北麓的关中城市群。在秦岭山地生态屏障作用下,秦岭山地南、北麓AOD差异明显,不论从极值、均值和南北坡相同海拔的AOD值来看,均表现出“南北分异”的特点,进一步说明了秦岭山地对AOD明显的阻隔作用。②秦岭山地对AOD表现出明显的海拔分层效应:AOD分布随海拔上升呈现对数下降趋势,在海拔2000 m(突变点)以下,AOD呈显著的加速下降趋势,速率为0.001/1000 m;在海拔2000 m以上,AOD呈显著的匀速下降趋势,速率接近为0。③AOD在秦岭山地不同地形下分布差异较大。平原区的集聚中心分布在海拔330~420 m处,集聚中心约79%的值集聚在0.35~0.71之间,并且在330~340 m之间出现了高值集聚中心(AOD=0.7);低山区的集聚中心分布在海拔900~1000 m处,约79%的值集聚在0.15~0.32之间;中山区的集聚中心分布在海拔1000~1400 m处,约60%的值集聚在0.19~0.3之间,此3种地形下,AOD均呈雾状分布;高山区AOD呈零星点状分布,无集聚中心。④在秦岭北坡,AOD集聚中心海拔分布为500 m,南坡集聚中心海拔约为1100~1200 m,北坡AOD集聚中心值(AOD=0.6)高于南坡(AOD=0.22)。AOD随着秦岭北坡海拔升高而呈对数下降趋势,南坡下降趋势不明显。The ecological barrier effect of Qinling Mountain on aerosol optical depth(AOD)and the relationship between aerosol and terrain were studied by spatial analysis and Kernel Density Estimation using AOD retrievals obtained from the Terra-MODIS Collection 6.1 Level-2 aerosol product at 3 km spatial resolution from January 2002 to December 2017.The results showed an obvious effect of the ecological barrier effect of the Qinling Mountain on atmospheric aerosol.An annual average AOD value at the northern foot of the Qinling Mountain was higher than that at the southern foot of the Qinling Mountain in the past 16 years.High-values of AOD were in Guanzhong urban agglomeration at the northern foot of Qinling Mountain.By comparing and analyzing the changes of AOD along different longitudes of Qinling Mountain,obvious differences were observed in AOD between the south and the north of Qinling Mountain in terms of extreme,mean and special values,which showed the characteristics of“north-south differentiation”and further illustrates the obvious barrier effect of Qinling Mountain on AOD.AOD over the Qinling Mountain showed a significant elevation stratification effect,i.e.,a logarithmic downward trend with the increase of elevation.Under the elevation of 2000 m(mutation point),AOD showed a significant accelerated downward trend with a rate of 0.001/1000 m.Over the elevation of 2000 m,AOD showed a significant uniform downward trend with a rate close to zero.The results also showed that the distribution of AOD varied greatly in different terrain of the Qinling Mountain.The AOD agglomeration centers in the plain areas were located at 330~420 m above mean sea level(a.s.l.),where 79%of AOD were concentrated between 0.35 and 0.71,and high-value AOD(AOD=0.7)agglomeration centers were located between 330 and 340 m.The AOD agglomeration centers in the low-mountains areas were located at 900~1000 m a.s.l.,and 79%of AOD were concentrated between 0.15 and 0.32.The AOD agglomeration centers in middle-mountains areas were located at 100

关 键 词：气溶胶光学厚度 秦岭山地 阻隔作用 地形分类 生态屏障作用 

分 类 号：X87[环境科学与工程—环境工程]