Authors: Li, Yuefang; Yao, Tandong; Wang, Ninglian; Li, Zhen; Tian, Lide; Xu, Baiqing; Wu, Guangjian

Source: Annals of Glaciology, Volume 43, Number 1, September 2006 , pp. 154-159(6)

Publisher: International Glaciological Society

Abstract:

Al, Mn, Rb, Sr, Ba, Cs, Bi and Sb were measured at various depth intervals of a 41.6 m firn/ice core drilled at an elevation of 7010 m near the top of Muztagh Ata glacier, east Pamirs (38°17′ N, 75°06′ E), central Asia. These data, spanning the mid-1950s to 2000, were obtained by analyzing 101 sections using a sector-field double-focusing inductively coupled plasma mass spectrometer (ICP-MS) instrument. This study provides the first time series for these metals from central Asia. Concentrations are 11.7-329 ng mL⁻¹ for Al, 0.33-42.7 ng mL⁻¹ for Mn, 0.42-17.8 ng mL⁻¹ for Sr, 0.04-1.4 ng mL⁻¹ for Rb, 0.18-10.4 ng mL⁻¹ for Ba, 2-167 pg mL⁻¹ for Cs, 2-51 pg mL⁻¹ for Sb and 1-31 pg mL⁻¹ for Bi. Large variations in metal concentrations were found during the study period. Pronounced increases in concentrations were observed for Sb and Bi from the mid-1960s to the beginning of the 1990s, suggesting increased anthropogenic sources of Sb and Bi in central Asia during the same period. However, the decrease of Sb and Bi concentrations during the mid- to late 1990s reflects a reduction in anthropogenic activities in central Asia.

Document Type: Research article

DOI: http://dx.doi.org/10.3189/172756406781812186

Publication date: 2006-09-01

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• The Annals of Glaciology is a peer-reviewed, thematic journal published 2 to 4 times a year by the International Glaciological Society (IGS). Publication frequency is determined and volume/issue numbers assigned by the IGS Council on a year-to-year basis and with a lead time of 3 to 4 years. The Annals of Glaciology is included in the ISI Science Citation Index from volume 50, number 50 onwards.

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