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Hf‐Nd‐Sr Isotopic Composition as Fingerprint for Long‐Range Transported Eolian Dust Deposition in Glacier Snowpack of Eastern Tibetan Plateau
Author(s) -
Dong Zhiwen,
Shao Yaping,
Qin Dahe,
Kang Shichang,
Wei Ting,
Wang Xuejia,
Wang Shijin
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2018jd028581
Subject(s) - aeolian processes , glacier , plateau (mathematics) , geology , snowpack , transect , physical geography , geomorphology , geochemistry , snow , oceanography , geography , mathematical analysis , mathematics
This study presents the Hf‐Nd‐Sr isotopic compositions of eolian dust deposited on glacier snowpacks along a longitude transect on the eastern Tibetan Plateau, in order to trace its source areas and the provenance of long‐range transported (LRT) Asian dust on the eastern margin of Tibetan Plateau. Most of the glacier snowpack samples from northern locations (Qiyi and Lenglongling Glaciers) indicated similar Hf‐Nd‐Sr isotopic ratios with that of large central Asian deserts. However, the southern locations (Dagu, Hailuogou, and Baishui Glaciers) showed dramatic difference in the Hf‐Nd‐Sr isotopic ratios of snowpack dust compared with those of large Asian deserts, but were more similar to that of Tibetan Plateau surface crust. Hf‐Nd isotopes indicated that the southern Tibetan Plateau locations are hardly influenced by central Asian dust, but probably influenced by southward dust transport from the Loess Plateau, in addition to the arid deserts on the Tibetan Plateau surface. Meteorological data and aerosol optical depth also demonstrated the potential differences of eolian dust transport and input between the north and south locations. Loess Plateau is even in today's climate a dust sink, but dust emission from the Loess Plateau is also possible. The influence of the Tibetan Plateau and southwest vortex of China to atmospheric circulation may have caused such eolian transport, in particular for LRT eolian dust transport to southeastern Tibetan Plateau glaicers. This study is also of importance in that the Hf‐Nd isotopic fingerprinting could provide new evidences for LRT dust deposition on the Tibetan Plateau.