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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 3 | Copyright
Atmos. Chem. Phys., 17, 1699-1711, 2017
https://doi.org/10.5194/acp-17-1699-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 03 Feb 2017

Research article | 03 Feb 2017

Dust deposition and ambient PM10 concentration in northwest China: spatial and temporal variability

Xiao-Xiao Zhang1,2, Brenton Sharratt3, Xi Chen1, Zi-Fa Wang2, Lian-You Liu4, Yu-Hong Guo2, Jie Li2, Huan-Sheng Chen2, and Wen-Yi Yang2 Xiao-Xiao Zhang et al.
  • 1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
  • 2State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 3USDA-ARS, 215 Johnson Hall, Washington State University, Pullman, WA 99164, USA
  • 4Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing, 100875, China

Abstract. Eolian dust transport and deposition are important geophysical processes which influence global bio-geochemical cycles. Currently, reliable deposition data are scarce in central and east Asia. Located at the boundary of central and east Asia, Xinjiang Province of northwestern China has long played a strategic role in cultural and economic trade between Asia and Europe. In this paper, we investigated the spatial distribution and temporal variation in dust deposition and ambient PM10 (particulate matter in aerodynamic diameter  ≤ 10µm) concentration from 2000 to 2013 in Xinjiang Province. This variation was assessed using environmental monitoring records from 14 stations in the province. Over the 14 years, annual average dust deposition across stations in the province ranged from 255.7 to 421.4tkm−2. Annual dust deposition was greater in southern Xinjiang (663.6tkm−2) than northern (147.8tkm−2) and eastern Xinjiang (194.9tkm−2). Annual average PM10 concentration across stations in the province varied from 100 to 196µgm−3 and was 70, 115 and 239µgm−3 in northern, eastern and southern Xinjiang, respectively. The highest annual dust deposition (1394.1tkm−2) and ambient PM10 concentration (352µgm−3) were observed in Hotan, which is located in southern Xinjiang and at the southern boundary of the Taklamakan Desert. Dust deposition was more intense during the spring and summer than other seasons. PM10 was the main air pollutant that significantly influenced regional air quality. Annual average dust deposition increased logarithmically with ambient PM10 concentration (R2 ≥ 0.81). While the annual average dust storm frequency remained unchanged from 2000 to 2013, there was a positive relationship between dust storm days and dust deposition and PM10 concentration across stations. This study suggests that sand storms are a major factor affecting the temporal variability and spatial distribution of dust deposition in northwest China.

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To improve our understanding of the fate and transport of airborne dust, there is a need for long-term records of dust deposition and concentration. This study characterized the spatial and temporal distribution in dust deposition and concentration in central Asia. The occurrence of high dust deposition and concentration suggests this region is a potential contributor to the global dust budget. This work will strengthen our comprehension of aerosol transport in global desertification regions.
To improve our understanding of the fate and transport of airborne dust, there is a need for...
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