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Remote Sensing for Land & Resources    2021, Vol. 33 Issue (1) : 240-248     DOI: 10.6046/gtzyyg.2020087
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The eco-barrier effect of Qinling Mountain on aerosols
MENG Qing1,2(), BAI Hongying1,2(), ZHAO Ting1,2, GUO Shaozhuang1,2, QI Guizeng1,2
1. College of Urban and Environmental Science, Northwest University, Xi’an 710127, China
2. Key Laboratory of Surface System and Environmental carrying Capacity of Shaanxi Province, Northwest University, Xi’an 710127, China
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Abstract  

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 2 000 m(mutation point), AOD showed a significant accelerated downward trend with a rate of 0.001/1 000 m. Over the elevation of 2 000 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 900~1 000 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 1 000~1 400 m a.s.l., and about 60% of AOD were concentrated between 0.19 and 0.3. AOD presented a foggy distribution under plain, low-mountain and middle-mountain areas. AOD in high-mountain areas presented a sporadic point distribution without concentration centers. On the northern slope of Qinling Mountain, the elevation distribution of AOD concentration center was 500 m, while that of the southern slope was about 1 100~1 200 m. The AOD concentration center value (AOD=0.6) on the northern slope was higher than that on the southern slope (AOD=0.22). The AOD decreased logarithmically with the elevation of the northern slope of Qinling Mountain, but the decreasing trend of the southern slope was not obvious.
Keywords aerosol optical depth      Qinling Mountain      barrier function      terrain classification      ecological barrier function     
ZTFLH:  X87  
Corresponding Authors: BAI Hongying     E-mail: qingmengmq@163.com;hongyingbai@163.com
Issue Date: 18 March 2021
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Qing MENG
Hongying BAI
Ting ZHAO
Shaozhuang GUO
Guizeng QI
Cite this article:   
Qing MENG,Hongying BAI,Ting ZHAO, et al. The eco-barrier effect of Qinling Mountain on aerosols[J]. Remote Sensing for Land & Resources, 2021, 33(1): 240-248.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020087     OR     https://www.gtzyyg.com/EN/Y2021/V33/I1/240
Fig.1  Location of the Qinling Mountains
Fig.2  Spatial distribution of AOD in each year during 2002-2017 over the southern and northern slopes of the Qinling Mountains
年份 北麓
AOD值		 南麓
AOD值		 年份 北麓
AOD值		 南麓
AOD值
2002年 0.35 0.26 2010年 0.39 0.26
2003年 0.31 0.23 2011年 0.40 0.28
2004年 0.32 0.23 2012年 0.35 0.25
2005年 0.35 0.23 2013年 0.37 0.29
2006年 0.41 0.29 2014年 0.32 0.23
2007年 0.42 0.30 2015年 0.35 0.23
2008年 0.35 0.25 2016年 0.31 0.21
2009年 0.36 0.27 2017年 0.27 0.19
Tab.1  Comparison of annual average AOD between 2002 and 2017 over the southern and northern slopes of the Qinling Mountains
Fig.3  Average AOD profile along different longitudes for 16 years over the Qinling Mountains
经度/
°E		 海拔/
m		 北坡
AOD值		 南坡
AOD值		 经度/
°E		 海拔/
m		 北坡
AOD值		 南坡
AOD值
107 834 0.30 0.20 1 170 0.17 0.20
978 0.27 0.23 1 489 0.15 0.20
1 079 0.24 0.20 1 794 0.17 0.18
1 266 0.21 0.25 109 524 0.58 0.25
1 565 0.19 0.19 626 0.50 0.25
108 446 0.58 0.18 1 059 0.38 0.29
545 0.53 0.39 1 653 0.20 0.18
639 0.48 0.24 110 687 0.52 0.28
727 0.41 0.36 1 098 0.36 0.26
1 038 0.30 0.24
Tab.2  Comparison of AOD values along different longitudes at the same altitude on the northern and southern slopes of the Qinling Mountains
Fig.4  Variation of AOD with Altitude over the Qinling Mountains during 16 Years
Fig.5  Topographic classification Map over the Qinling Mountains
Fig.6  Distribution of AOD under four topographical conditions over the Qinling Mountains
Fig.6-2  Distribution of AOD under four topographical conditions over the Qinling Mountains
Fig.7  Distribution of AOD at northern and southern slopes over the Qinling Mountains
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