Depositional characteristics of NH₄⁺ on Ürümqi glacier No. 1, eastern Tien Shan, China

Authors: Huilin, Li; Zhongqin, Li; Wenbin, Wang; Feiteng, Wang

Source: Annals of Glaciology, Volume 49, Number 1, October 2008 , pp. 161-165(5)

Publisher: International Glaciological Society

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Abstract:

Investigation into the depositional and post-depositional processes of atmospheric NH₄⁺ on Ürümqi glacier No. 1 (UG1), China, was implemented within the Program for Glacier Processes Investigation (PGPI) campaign. Aerosol and surface snow samples were collected concurrently on a weekly basis from March 2004 to March 2005 in the UG1 accumulation zone at the headwaters of the Ürümqi river, eastern Tien Shan. All samples were analyzed for NH₄⁺ and other chemical species. This paper investigates the seasonal variations of NH₄⁺. A significant linear relationship (R² = 0.70, N = 21, P < 0.01) between NH₄⁺ concentrations in surface snow and aerosol was found during spring and summer, indicating that the warm-wet condition facilitates the air-snow exchange of NH₄⁺. Humidity was found to be a significant meteorological factor influencing NH₄⁺ in deposition in autumn and winter. The NH₄⁺ concentration in aerosol clearly shows a trend similar to that in surface snow, suggesting that the variation of atmospheric NH₄⁺ might have been preserved in the surface snow. The possible source of NH₄⁺ is discussed in this paper.

Document Type: Research article

DOI: http://dx.doi.org/10.3189/172756408787814762

Publication date: 2008-10-01

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