Do fine-grained components of loess indicate westerlies: Insights from observations of dust storm deposits at Lenghu (Qaidam Basin, China)

Qiang, Mingrui; Lang, Lili; Wang, Z.

doi:10.1016/j.jaridenv.2010.06.002

Cited by 77 publications

(33 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fine particles can also be incorporated into silt-or sandsized aggregates which can be transported by a range of wind velocities, including dust storms (Derbyshire et al, 1998;Mason et al, 2003;Pye, 1995;Qiang et al, 2010). For example, Ujvari et al (2016) argued that ∼ 1-20 µm fractions are affected by aggregation, as shown by comparison between minimally and fully dispersed grain size distribution measurements of loess samples from southern Hungary.…”

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

confidence: 99%

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

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.

show abstract

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

confidence: 99%

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

“…The limited number of convincing paleoclimatic evidence for the NH westerlies in the mid-Pliocene derives mainly from the aeolian sediments on the Chinese Loess Plateau (e.g., Sun, 2004;Sun et al, 2008) and from certain North Pacific deep-sea sites (e.g., Rea and Leinen, 1988;Rea, 1994). However, Qiang et al (2010) concluded that caution should be exercised when using the fine dust records on the Chinese Loess Plateau as an indicator of the characteristics of the westerlies. It is more robust to use the North Pacific deep-sea aeolian sediments to retrieve the westerly intensity.…”

Section: Model-data Comparisonmentioning

confidence: 99%

Mid-Pliocene westerlies from PlioMIP simulations

Jiang

Zhang

et al. 2015

Adv. Atmos. Sci.

View full text Add to dashboard Cite

The midlatitude westerlies are one of the major components of the global atmospheric circulation. They play an important role in midlatitude weather and climate, and are particularly significant in interpreting aeolian sediments. In this study, we analyzed the behavior and the possible mechanism involved in the change of the westerlies, mainly in terms of the jet stream position, in the mid-Pliocene warm period (3.3 to 3.0 million years ago) using simulations of 15 climate models from the Pliocene Model Intercomparison Project (PlioMIP). Compared to the reference period, the mid-Pliocene midlatitude westerlies generally shifted poleward (approximately 3.6 • of latitude in the Northern Hemisphere and 1.9 • of latitude in the Southern Hemisphere at 850 hPa level) with a dipole pattern. The dipole pattern of the tropospheric zonal wind anomalies was closely related to the change of the tropospheric meridional temperature gradient as a result of thermal structure adjustment. The poleward shift of the midlatitude westerly jet corresponded to the poleward shift of the mean meridional circulation. The sea surface temperatures and sea ice may have affected the simulated temperature structure and zonal winds, causing the spread of the westerly anomalies in the mid-Pliocene between the atmosphere-only and coupled atmosphere-ocean general circulation model simulations.

show abstract

“…Regional strong wind erosion exist(ed) in the QB in modern (Qiang et al, 2007(Qiang et al, , 2010 and ancient times Pullen et al, 2011;Rohrmann et al, 2013). Therefore, a comparison between the coarse fractions of Type II samples and modern dust in the leeward area of the northwestern QB, Qinghai Lake ( Fig.…”

Section: Lacustrine Sedimentary Environment In the Jianshan Anticlinementioning

confidence: 99%

A 7.3–1.6Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau

Yin

Fang

Appel

et al. 2015

Sedimentary Geology

View full text Add to dashboard Cite

Do fine-grained components of loess indicate westerlies: Insights from observations of dust storm deposits at Lenghu (Qaidam Basin, China)

Cited by 77 publications

References 39 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

Mid-Pliocene westerlies from PlioMIP simulations

A 7.3–1.6Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau

Contact Info

Product

Resources

About