Contrasting dust supply patterns across the north-western Chinese Loess Plateau during the last glacial-interglacial cycle

Vriend, Mirjam; Prins, Maarten A.; Buylaert, Jan‐Pieter; Vandenberghe, Jef; Lu, Huayu

doi:10.1016/j.quaint.2010.11.009

Cited by 81 publications

(52 citation statements)

References 46 publications

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“…3b), which approximately corresponds to the "subgroup 1.b.1" of Vandenberghe (2013). The mode is similar to end-members identified in loess from the CLP and north-eastern Tibetan Plateau (NE-TP) (EM2: 44 µm) (Vriend et al, 2011). The size of this component is unlikely to be due to longerdistance transport.…”

Section: Genetic Interpretations Of End-members In Loess Grain Sizesupporting

confidence: 59%

“…Conversely, Zhang et al (1999) argued that < 20 µm particle fractions derive from "non-dust storm processes" associated with northwesterly surface winds. We argue for the latter on the basis that the EM3 modal grain size from the CLP and NE-TP is coarser (Vriend et al, 2011) than EM3 at NLK in the Ili Valley, which is located further west. If EM3 was transported by high-level westerlies, then one would expect either no significant change (Rea and Hovan, 1995;Rea et al, 1985), or a decrease in grain size from west to east concomitant with wind direction.…”

Section: Genetic Interpretations Of End-members In Loess Grain Sizementioning

confidence: 79%

“…The size of this component is unlikely to be due to longerdistance transport. Rather, it is inferred to derive from a shorter-distance transport of a suspended load (Vandenberghe, 2013;Vriend et al, 2011). Coarser particles (> 20 µm) rarely reach suspension above the near surface (0-200 m above the ground).…”

Section: Genetic Interpretations Of End-members In Loess Grain Sizementioning

confidence: 99%

“…On the one hand, researchers have suggested that grains of this size can be lifted by strong vertical air movement and subsequently incorporated into the high-level westerly air streams (Pye, 1995;Pye and Zhou, 1989). This process would link EM3 with long-term suspension transport driven by high-level westerlies (Nottebaum et al, 2014;Vandenberghe, 2013;Vriend et al, 2011). Conversely, Zhang et al (1999) argued that < 20 µm particle fractions derive from "non-dust storm processes" associated with northwesterly surface winds.…”

Section: Genetic Interpretations Of End-members In Loess Grain Sizementioning

confidence: 99%

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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

Song

Fitzsimmons

et al. 2018

Clim. Past

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Abstract. 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 (χ 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 µm; EM2, 33.6 µm; EM3, 18.9 µm) 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.

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Section: Genetic Interpretations Of End-members In Loess Grain Sizesupporting

confidence: 59%

Section: Genetic Interpretations Of End-members In Loess Grain Sizementioning

confidence: 79%

Section: Genetic Interpretations Of End-members In Loess Grain Sizementioning

confidence: 99%

Section: Genetic Interpretations Of End-members In Loess Grain Sizementioning

confidence: 99%

See 2 more Smart Citations

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

Song

Fitzsimmons

et al. 2018

Clim. Past

View full text Add to dashboard Cite

show abstract

“…Some have also suggested that the loess has multiple sources, and that before deposition these materials are mixed by changes in the local-to regional-scale atmospheric circulations (Kreutz and Sholkovitz, 2000). In addition to variations in loess sources, it has been suggested that the low wind velocity, low temperatures, and decreased precipitation during glacial periods (i.e., stages that are marked by colder temperatures and glacier advances) led to an increased frequency of dust events (Guan et al, 2013;Peng et al, 2014), and that this had a significant impact on the thickness of loess on the CLP (Porter, 2001;Vriend et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Geochemical evidence for seasonal variations in potential loess sources of the western Chinese Loess Plateau

Wang

Lang

et al. 2015

Atmospheric Environment

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Aeolian process and climatic changes in loess records from the northeastern Tibetan Plateau: Response to global temperature forcing since 30 ka

Vandenberghe

et al. 2015

Paleoceanography

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The response of surface processes to global climatic changes since the last glacial is critical to understanding the mechanism of climatic changes on the Tibetan Plateau. In this study, loess from the northeastern Tibetan Plateau (NETP) was closely spaced dated to provide an independent high-resolution record of dust accumulation processes and millennial-scale climatic changes. Optically stimulated luminescence ages reveal episodes of rapid dust deposition at approximately 12.3 ka, 16 ka, 21-23 ka, 25-28 ka, and possibly also at 30-33 ka. These episodes are broadly correlated with high-latitude and marine records cold climatic events, such as the Younger Dryas, Heinrich event 1, and the Last Glacial Maximum. This correlation implies that dust storms in the NETP represent episodic aridification and wind strengthening, which is ascribed to the southward shift of the polar front and the intensification of the Siberian high-pressure cell that was forced by millennial-scale cooling in high northern latitudes.

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Contrasting dust supply patterns across the north-western Chinese Loess Plateau during the last glacial-interglacial cycle

Cited by 81 publications

References 46 publications

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

Geochemical evidence for seasonal variations in potential loess sources of the western Chinese Loess Plateau

Aeolian process and climatic changes in loess records from the northeastern Tibetan Plateau: Response to global temperature forcing since 30 ka

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