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Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin
Li, Yue1,2,3; Song, Yougui1; Fitzsimmons, Kathryn E.2; Chang, Hong1; Orozbaev, Rustam4,5; Li, Xinxin1
2018-03-06
发表期刊CLIMATE OF THE PAST
卷号14期号:3页码:271-286
文章类型Article
摘要The extensive loess deposits of the Eurasian midlatitudes 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 (chi fd%) 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 mu m; EM2, 33.6 mu m; EM3, 18.9 mu m) 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.
WOS标题词Science & Technology ; Physical Sciences
DOI10.5194/cp-14-271-2018
关键词[WOS]GRAIN-SIZE DISTRIBUTION ; LATE QUATERNARY LOESS ; CHINESE LOESS ; AEOLIAN DUST ; TIEN-SHAN ; PALEOCLIMATIC IMPLICATIONS ; ATMOSPHERIC CIRCULATION ; MAGNETIC MINERALOGY ; SOUTHERN TAJIKISTAN ; LATE PLEISTOCENE
收录类别SCI
语种英语
WOS研究方向Geology ; Meteorology & Atmospheric Sciences
WOS类目Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号WOS:000426904500001
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文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5222
专题古环境研究室
作者单位1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
2.Max Planck Inst Chem, Res Grp Terr Palaeoclimates, D-55128 Mainz, Germany
3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
4.Natl Acad Sci Kyrgyz Republ, Inst Geol, Bishkek 720040, Kyrgyzstan
5.Chinese Acad Sci, Res Ctr Ecol & Environm Cent Asia, Urumqi 830011, Peoples R China
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Li, Yue,Song, Yougui,Fitzsimmons, Kathryn E.,et al. Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin[J]. CLIMATE OF THE PAST,2018,14(3):271-286.
APA Li, Yue,Song, Yougui,Fitzsimmons, Kathryn E.,Chang, Hong,Orozbaev, Rustam,&Li, Xinxin.(2018).Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin.CLIMATE OF THE PAST,14(3),271-286.
MLA Li, Yue,et al."Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin".CLIMATE OF THE PAST 14.3(2018):271-286.
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