Publication Date:
2023-07-21
Description:
〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉ABSTRACT〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Reconstruction of mass accumulation rates (MARs) in loess deposits are widely used for interpreting long‐term aeolian transport and climate dynamics in terrestrial environments. However, these interpretations are often driven by a preponderance of reconstructions from individual or selected sites, which can bias our understanding of past climate, especially in the absence of other proxy information. Recent studies on MARs from multiple loess sites in Arid Central Asia (ACA) reveal disparities in the timing of peaks in accumulation between sites, as well as asynchronies with loess flux in the Chinese Loess Plateau (CLP). We investigate this issue by (1) dating five new sites from the western Ili Basin, therefore extending the spatial cover of loess chronologies across ACA and (2) combining that with MARs from >30 sites across ACA and the CLP over the last 60 ka. Our results indicate spatio‐temporal inhomogeneity in the timing and rate of loess deposition across the ACA, and highlight the importance of interrogating local and regional influences on dust supply and transport. Our synthesis of MARs from ACA and the CLP suggests that the timing of peak dust flux as an indicator of large‐scale climate dynamics is best derived from an aggregate of sites; this removes site‐specific bias where local processes or topographic settings outweigh the climate signature.〈/p〉
Description:
L Lisá acknowledges the support of internal program No. RVO67985831 of the Institute of Geology CAS, Prague and OP RDE, MEYS under the project ‘Ultra‐trace isotope research in social and environmental studies using accelerator mass spectrometry’, Reg. No. CZ.02.1.01/0.0/0.0/16_019/0000728.
Description:
This study was funded by an independent Max Planck Research Group awarded by the Max Planck Society to KE Fitzsimmons.
Keywords:
ddc:551.3
;
ddc:
;
Central Asia
;
Chinese Loess Plateau
;
loess
;
luminescence dating
;
mass accumulation rates
Language:
English
Type:
doc-type:article
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