A luminescence dating study of loess deposits from the Yili River basin in western China

Chongyi, E; Lai, Zhongping; Sun, Yajuan; Hou, Guangliang; Yu, Lupeng; Wu, Chunlin

doi:10.1016/j.quageo.2012.04.022

Cited by 59 publications

(23 citation statements)

References 28 publications

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“…However, three loess profiles in southern Kazakhstan (also within the Ili Basin) recorded increased loess accumulation during MIS3 (Fitzsimmons et al, ). We also notice the similar MIS3 loess deposition patterns have been reported in the Ili Basin (ChongYi et al, ; Feng et al, ; Li, Chen, et al, ; Song, Luo, et al, ; Text S1 and Figure S1 in the supporting information). Although the timing of peak accumulation rates and absolute rates through time are various from site to site, increased MIS3 loess accumulation may represent the pervasive scenario in the Ili Basin related to regional wind regimes and climate subsystems, which provide insights into the loess formation processes in the Ili Basin.…”

Section: Introductionsupporting

confidence: 87%

Atmospheric Dust Variations in the Ili Basin, Northwest China, During the Last Glacial Period as Revealed by a High Mountain Loess‐Paleosol Sequence

Song

Qiang

et al. 2019

JGR Atmospheres

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Atmospheric dust emission is closely related to conditions in the source area. Typically, loess deposits represent the accumulation of locally derived dust, providing the opportunity to reconstruct past variations in dust emission and hence insights into dust-climate linkages and the underlying mechanisms of dust mobilization, transport, and deposition. As yet, however, information on patterns of dust emission in Central Asia is sparse. Here we present the last glacial sedimentological data of a loess section from the Ili Basin, northwest China. Our results show that the variations in sand-sized fraction can indicate frequencies of occurring strong winds, which was likely driven by the Eurasian ice sheets during Marine Isotope Stage Stage 2 (MIS2) and MIS4 and by the boreal summer insolation during MIS3. The mass accumulation rate (MAR) reflects an integration of sediment availability in the provenance, vegetation cover in the deposition area, and wind regime. The differences of driving factors potentially explain the observed mismatches between variations in grain size and MAR. Comparison of dust fluxes observed in Greenland ice core and the North Pacific deep-sea sediment with the Central/East Asian MAR records supports the idea that the high flux of long-distance export of Asian dust is closely associated with the Siberian High and also influenced by changes in the atmospheric transport efficiency and likely by the source strength.

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Section: Introductionsupporting

confidence: 87%

Atmospheric Dust Variations in the Ili Basin, Northwest China, During the Last Glacial Period as Revealed by a High Mountain Loess‐Paleosol Sequence

Song

Qiang

et al. 2019

JGR Atmospheres

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“…Data regarded reliable by the authors and fulfilling the criteria outlined in section 2.1 are contained in publications by ChongYi et al, 2012;Constantin et al, 2014Constantin et al, , 2015Kreutzer et al, 2012;Lu et al, 2007 (one age fulfills criteria but is not regarded as robust by the authors); Meszner et al, 2013; Timar-Gabor et al, 2011. For unknown reasons the dataset by Meszner et al, (2013) suggests random uncertainty to largely exceed the overall uncertainty (see supplementary Fig.…”

Section: Inverse Modellingmentioning

confidence: 99%

Discriminating luminescence age uncertainty composition for a robust Bayesian modelling

Zeeden

Dietze

Kreutzer

2018

Quaternary Geochronology

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Age-depth-relationships are essential to understand expressions of Earth history. Age-depth-relationships reveal the environmental significance of (terrestrial) sediment deposits and relate them to other paleoenvironmental archives. Although luminescence-based ages are of paramount importance, their incorporation in age-depth-models is limited due to the convolved uncertainties with unknown proportions of systematic and random parts. Here, we use an inverse modelling approach for fine-grained quartz OSL ages of loess deposits to i) generate a probability density function of the random uncertainty part and ii) use this function to recalculate and improve stratigraphically related OSL ages. Our approach can be applied to other luminescence dating techniques. Applying the algorithm to synthetic data sets generates valid results, despite an average underestimation of the relative random uncertainty by~18 %. All tests show that precision of the inverse modelling of uncertainty parts depends only on the number of samples per dataset. By using the output of the approach on published data the precision of a late Pleistocene loess sequence chronology was improved by 21-30%.

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“…Marine isotope stage 5 (MIS 5), which contains three warm intervals, including the last interglacial maximum, is an excellent candidate for addressing the foregoing question. High-resolution and quasi-continuous Late Quaternary paleoclimatic records for ACA are available only from loess deposits (Ding et al, 2002;ChongYi et al, 2012;Jia et al, 2012;Song et al, 2012); the records mainly come from the Tienshan Mountains and the surrounding area, which have a relatively humid climate. In the present study, we reconstruct the history of moisture dynamics in the Yili River valley during MIS 5.…”

Section: Introductionmentioning

confidence: 99%

Moisture variations in arid central Asia and its out‐of‐phase relationship with the Asian Monsoon during MIS 5: evidence from loess records

Jia

Gao

Xia

et al. 2018

J Quaternary Science

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An out‐of‐phase relationship between moisture variations in arid central Asia (ACA) and Monsoon Asia is revealed in various Holocene sedimentary records. To determine whether this relationship also occurred during previous warm intervals, we reconstructed the history of moisture variations during Marine Isotope Stage 5 (MIS 5) recorded in a loess profile from the Yili valley in the Tienshan Mountains, in ACA, and compared it with the record from the Chinese Loess Plateau (CLP). Three humid episodes in the Yili valley are recorded, at 72–79.5, 93.5–101 and 113.5–125.5 ka; in addition, intervals of fine grain size, indicating a low incidence of dust storms, and thus low ice volume in the Northern Hemisphere, occurred during 76–83.5, 97–106 and 117.5–130 ka. Our findings indicate that during MIS 5, variations in humidity in ACA lagged (by ∼3–5 ka) variations in the Asian Monsoon recorded by magnetic and grain‐size proxies from the CLP. Furthermore, we propose that precipitation variations in ACA were negatively correlated with the intensity of the Asian Monsoon because of corresponding movements in pressure and rain belts, and were positively correlated with sea surface temperature variations in the North Atlantic.

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A luminescence dating study of loess deposits from the Yili River basin in western China

Cited by 59 publications

References 28 publications

Atmospheric Dust Variations in the Ili Basin, Northwest China, During the Last Glacial Period as Revealed by a High Mountain Loess‐Paleosol Sequence

Atmospheric Dust Variations in the Ili Basin, Northwest China, During the Last Glacial Period as Revealed by a High Mountain Loess‐Paleosol Sequence

Discriminating luminescence age uncertainty composition for a robust Bayesian modelling

Moisture variations in arid central Asia and its out‐of‐phase relationship with the Asian Monsoon during MIS 5: evidence from loess records

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