Grain size in sediments from Lake Sugan: a possible linkage to dust storm events at the northern margin of the Qinghai–Tibetan Plateau |
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| Authors: | Mingrui Qiang Fahu Chen Jiawu Zhang Ruiping Zu Ming Jin Aifeng Zhou Shun Xiao |
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| Institution: | (1) Key Laboratory of Western China’s Environmental System (Ministry of Education), CAEP, Lanzhou University, Lanzhou, 730000, People’s Republic of China;(2) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China |
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| Abstract: | Samples of surface deposits in the Lake Sugan catchment, as well as surface lake sediments, eolian materials occulted in the
lake ice cover, and airborne dust were collected for grain-size analysis. The results show that the coarse fraction of the
lake sediments could be transported by ambient winds and to a lesser extent by river flow in the study area. Sediment cores
were retrieved from Lake Sugan in December 2000, and 210Pb and 137Cs dating and grain-size analyses were performed on these samples. 210Pb ages and the volume percentage of the fraction of lake sediments >63 μm were used to reconstruct the dust storm history
from 1957 to 2000. Observational data for dust storm events collected at a local meteorological station largely agrees with
the reconstructed trend for the past 44 years, suggesting that lake sediments can be employed to trace the dust storm history
of the northern Qinghai–Tibetan Plateau. |
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| Keywords: | Lake sediment Grain size Dust storm Lake Sugan |
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