The patchwork loess of Central Asia: Implications for interpreting aeolian dynamics and past climate circulation in piedmont regions
Dave A.K. Lisá L. Scardia G. Nigmatova S. Fitzsimmons K.E.
May 2023John Wiley and Sons Ltd
Journal of Quaternary Science
2023#38Issue 4526 - 543 pp.
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.
Central Asia , Chinese Loess Plateau , loess , luminescence dating , mass accumulation rates
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Research Group for Terrestrial Palaeoclimates, Max Planck Institute for Chemistry, Mainz, Germany
Department of Geosciences, University of Tübingen, Schnarrenbergstrasse 94-96, Tübingen, 72076, Germany
Institute of Geology, Czech Academy of Sciences, Prague, Czech Republic
Nuclear Physics Institute of the Czech Academy of Sciences, CRL Radiocarbon Laboratory, Na Truhlářce 39/64, Prague 6, 18086, Czech Republic
Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista (UNESP), Rio Claro SP, 13506-900, Brazil
Institute of Geological Sciences K. Satpaeva, Ministry for Education and Science of the Republic of Kazakhstan, Almaty, Kazakhstan
Research Group for Terrestrial Palaeoclimates
Department of Geosciences
Institute of Geology
Nuclear Physics Institute of the Czech Academy of Sciences
Instituto de Geociências e Ciências Exatas
Institute of Geological Sciences K. Satpaeva
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