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| Black carbon in seasonal snow across northern of Xinjiang |
| CHEN Wen-qian1,2, DING Jian-li1,2, ZHANG Zhe1,2, WANG Xin3, PU Wei3, LIU Bo-hua1,2, CAO Xiao-yi1,2 |
1. Xinjiang Common University Key Lab of Smart City and Environmental Stimulation, Xinjiang University;
2. Key Laboratory of Oasis Ecology Ministry of Education, Urumqi 830046;
3. Key Laboratory for Semi-Arid Climate Change, Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China |
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Abstract This paper analysed seasonal snow cover, AOD, BC (black carbon) concentration with MODIS data and samples data measured in January 2018 in the field, and obtained the potential BC transmission path through the HYSPLIT-4 to get the day-to-day back trajectory of every sample. The results showed that:① Snow cover in northern Xinjiang reached 97.5%, which gradually increased from November to January. The average AOD in northern Xinjiang was 0.173, high values appeared in the northern slope economic zone of the Tianshan Mountains and eastern part of the Tianshan Mountains (0.2~0.35), however, the low was mainly distributed in Altay (0.06~0.1) ②The BC concentrations in the surface snow ranged from 44.08 to 1949.9ng/g, with an average of 536.71ng/g. The BC concentration distribution in northern Xinjiang was the northern slope of the Tianshan Mountains (913.24ng/g) > Southeastern of Ebinur Lake (816.56ng/g) > Northern of Ebinur Lake (421.94ng/g) > Western of Ebinur Lake (407.97ng/g) > Area of Karamay (162.28ng/g)) > Gurbantunggut Desert Region (124.89ng/g) > Altay Region (98.51ng/g). The concentration of BC in snow in northern Xinjiang increased slightly with higher altitude, R2 was 0.03. With the increase of latitude, the concentration of BC in snow had a decreasing trend, R2 was 0.255. ③The trajectory cluster analysis of the samples showed that the backward trajectory of the Ebinur Lake basin dominated by the northeastern direction of the Bole-Jinghe-Ebinur Lake, and this trajectory had a greater impact on the concentration of BC in snow; the economic zone on the northern slope of the Tianshan Mountains dominated by the northeastern cities of Jinghe-Shihezi-Urumqi on the northern slope of the Tianshan Mountains, the result showed that local pollution was serious. The backward trajectory of the Altay region dominated by the Russian-Northern Kazakhstan-East Kazakhstan transport path with less contribution from local pollution; the Karamay region was mainly transported from easten of Kazakhstan, it's local pollution was not obvious. And the desert area dominated by the southwestern direction.
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Received: 12 June 2018
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