<SUP>210</SUP>Pb dating of the Miaoergou ice core from the eastern Tien Shan, China

Wang, Chaomin; Hou, Shugui; Pang, Hongxi; Liu, Yaping; Gäggeler, Heinz W.; Tobler, Leonhard; Szidat, Sönke; Vogel, Edith (2014). <SUP>210</SUP>Pb dating of the Miaoergou ice core from the eastern Tien Shan, China. Annals of glaciology, 55(66), pp. 105-110. International Glaciological Society 10.3189/2014AoG66A151

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In 2005, two ice cores with lengths of 58.7 and 57.6 m respectively to bedrock were recovered from the Miaoergou flat-topped glacier (43 degrees 03 ' 19 '' N, 94 degrees 19 ' 21 '' E; 4512 m a.s.l.), eastern Tien Shan. Pb-210 dating of one of the ice cores (57.6 m) was performed, and an age of AD 1851 +/- 6 at a depth of 35.2 m w.e. was determined. For the period AD 1851-2005, a mean annual net accumulation of 229 +/- 7 mm w.e. a(-1) was calculated. At the nearby oasis city of Hami (similar to 80 km from the Miaoergou flat-topped glacier) the annual precipitation rate is 38 mm w.e. a(-1), hence glacial meltwater is a major water supply for local residents. The surface activity concentration of Pb-210(ex) was found to be similar to 400 mBq kg(-1), which is higher than observed at other continental sites such as Belukha, Russia, and Tsambagarav, Mongolia, which have surface activity concentrations of 280 mBq kg(-1). The Pb-210 dating agrees well with the chronological sequence deduced from the annual-layer counting resulting from the seasonalities of delta O-18 and trace metals for the period AD 1953-2005, and beta-activity horizons resulting from atmospheric nuclear testing during the period AD 1962-63. We conclude that Pb-210 analysis is a suitable method for obtaining a continuous dating of the Miaoergou ice core for similar to 160 years, which can also be applied to other ice cores recovered from the mountains of western China.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Szidat, Sönke and Vogel, Edith

Subjects:

500 Science > 540 Chemistry
500 Science > 550 Earth sciences & geology

ISSN:

0260-3055

Publisher:

International Glaciological Society

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

24 Oct 2014 08:44

Last Modified:

08 Sep 2017 11:23

Publisher DOI:

10.3189/2014AoG66A151

BORIS DOI:

10.7892/boris.59540

URI:

https://boris.unibe.ch/id/eprint/59540

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