eolian dust dispersal patterns since the last glacial period in eastern central asia: insights from a loess-paleosol sequence in the ili basin
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2018
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Abstract
The extensive loess deposits of the Eurasian mid-latitudes provide important
terrestrial archives of Quaternary climatic change. As yet, however, loess
records in Central Asia are poorly understood. Here we investigate the grain
size and magnetic characteristics of loess from the Nilka (NLK) section in
the Ili Basin of eastern Central Asia. Weak pedogenesis suggested by
frequency-dependent magnetic susceptibility (χfd%) and
magnetic susceptibility (MS) peaks in primary loess suggest that MS is more
strongly influenced by allogenetic magnetic minerals than pedogenesis, and
may therefore be used to indicate wind strength. This is supported by the
close correlation between variations in MS and proportions of the sand-sized
fraction. To further explore the temporal variability in dust transport
patterns, we identified three grain size end-members (EM1, mode size
47.5 µm; EM2, 33.6 µm; EM3, 18.9 µm) which represent
distinct aerodynamic environments. EM1 and EM2 are inferred to represent
grain size fractions transported from proximal sources in short-term,
near-surface suspension during dust outbreaks. EM3 appears to represent a
continuous background dust fraction under non-dust storm conditions. Of the
three end-members, EM1 is most likely the most sensitive recorder of wind
strength. We compare our EM1 proportions with mean grain size from the
Jingyuan section in the Chinese loess plateau, and assess these in the
context of modern and Holocene climate data. Our research suggests that the Siberian
High pressure system is the dominant influence on wind dynamics,
resulting in loess deposition in the eastern Ili Basin. Six millennial-scale cooling
(Heinrich) events can be identified in the NLK loess records. Our grain size
data support the hypothesis that the Siberian High acts as teleconnection
between the climatic systems of the North Atlantic and East Asia in the high
northern latitudes, but not for the mid-latitude westerlies.
| Reference Key |
li2018climateeolian
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|---|---|
| Authors | ;Y. Li;Y. Li;Y. Li;Y. Song;K. E. Fitzsimmons;H. Chang;R. Orozbaev;R. Orozbaev;X. Li |
| Journal | proceedings - 16th ieee/acis international conference on computer and information science, icis 2017 |
| Year | 2018 |
| DOI |
10.5194/cp-14-271-2018
|
| URL | |
| Keywords |
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