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- W2360793497 abstract "Two loess-paleosol sequences at the Weinan and Xifeng sections spanning the last climatic cycle were investigated to better understand the spatial and temporal variations of the soil color(e.g.,lightness and redness) and their major controlling factors.Our results show that lightness and redness are significantly different between loess and paleosols layers,with relatively low lightness values and high redness values in the paleosol layers.Variations in the lightness are strongly linked to the concentrations of iron oxides,organic matter and calcium carbonate.Relative impacts of these factors on the lightness decrease gradually from iron oxides and organic matter to calcium carbonate.By contrast,the redness is dominantly controlled by types(e.g.,goethite and hematite) and concentrations of iron oxides.It is noteworthy that during the transition of L2 to S1,changes in the magnetic susceptibility and lightness differ significantly from that of the redness,implying that either magnetic susceptibility or redness has limitations for inferring the summer monsoon intensity.While variations in the magnetic susceptibility and redness are controlled by different magnetic minerals,these two proxies are closely associated with post-depositional processes such as chemical weathering and pedogenesis.Here we combine these two indicators by normalizing each proxy and averaging as a stacked summer monsoon index and interpret this proxy as the most indicative of summer monsoon variability.This new proxy provides a new clue to better understanding the summer monsoon variation,in particular the pattern of the summer monsoon strengthening during the penultimate deglaciation." @default.
- W2360793497 created "2016-06-24" @default.
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- W2360793497 date "2010-01-01" @default.
- W2360793497 modified "2023-09-23" @default.
- W2360793497 title "Changing color of Chinese loess:Controlling factors and paleocliamtic significances" @default.
- W2360793497 hasPublicationYear "2010" @default.
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