Penetration of Atlantic westerly winds into Central and East Asia

Vandenberghe, Jef; Renssen, H.; Huissteden, J. van; Nugteren, Govert; Konert, M.; Lu, Huayu; Dodonov, A.E.; Buylaert, Jan‐Pieter

doi:10.1016/j.quascirev.2006.02.017

Cited by 177 publications

(122 citation statements)

References 39 publications

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“…S1). Considering the transitional position of this region and the regression of Asian Summer Monsoon, these wet conditions during the late-Holocene probably reflect the influence of the Westerlies as was reported by Vandenberghe et al (2006) and Chen et al (2008). However, probably owing to the lack of continuous records, our study does not confirm an out-of-phase moisture evolution pattern during the mid and late Holocene in the arid central Asian area as reported by Chen et al (2008) who described a dry early Holocene (12-8 cal.…”

Section: The Asynchronous Nature Of the Asian Monsoonal Subsystems: Psupporting

confidence: 56%

Asynchronous evolution of the Indian and East Asian Summer Monsoon indicated by Holocene moisture patterns in monsoonal central Asia

Wang

Liu

Herzschuh

2010

Earth-Science Reviews

293

111

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a b s t r a c t a r t i c l e i n f oThe numerical meta-analysis of 92 proxy records (72 sites) of moisture and/or temperature change confirms earlier findings that the dominant trends of climatic evolution in monsoonal central Asia since the Last Glacial roughly parallel changes in Northern Hemisphere summer insolation, i.e. the period following the Last Glacial Maximum was characterized by dry and cold conditions until 15 cal. kyr BP, followed by a warm, wet period coincident with the Bølling/Allerød warm period and terminated by a cold, dry reversal during the Younger Dryas period. After an abrupt increase at the start of the Holocene, warm and wet conditions prevailed until ca. 4 cal. kyr BP when moisture levels and temperatures started to decrease. Ordination of moisture records reveals strong spatial heterogeneity in moisture evolution during the last 10 cal. kyr. The Indian Summer Monsoon (ISM) areas (northern India, Tibetan Plateau and southwest China) exhibit maximum wet conditions during the early Holocene, while many records from the area of the East Asian Summer Monsoon indicate relatively dry conditions, especially in north-central China where the maximum moisture levels occurred during the mid-Holocene. We assign such phenomena to strengthened Hadley Circulation centered over the Tibetan Plateau during the early Holocene which resulted in subsidence in the East Asian monsoonal regions leading to relatively dry conditions. Our observations of the asynchronous nature of the two Asian monsoon subsystems on millennial time scales have also been observed on annual time-scales as well as implied through the spatial analysis of vertical air motion patterns after strong ascending airflows over the Tibetan Plateau area that were calculated from NCEP/NCAR reanalysis data for the last 30 years. Analogous with the early Holocene, the enhancement of the ISM in a 'future warming world' will result in an increase in the asynchronous nature of the monsoon subsystems; this trend is already observed in the meteorological data from the last 15 years.

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Section: The Asynchronous Nature Of the Asian Monsoonal Subsystems: Psupporting

confidence: 56%

Asynchronous evolution of the Indian and East Asian Summer Monsoon indicated by Holocene moisture patterns in monsoonal central Asia

Wang

Liu

Herzschuh

2010

Earth-Science Reviews

293

111

View full text Add to dashboard Cite

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“…Stronger westerly winds in the upper troposphere and northwesterly winds in the lower troposphere that bring more cold air to Asia and northeast China in particular could have amplified the cooling at Hani during the last glacial compared to other Asian sites. There is supporting evidence from Lake Qinghai in the northeastern Tibetan Plateau , Central Asia (Vandenberghe et al, 2006), and the Chinese Loess Plateau (Porter and An, 1995;Vandenberghe et al, 2006;Sun et al, 2012) that indicate that the westerlies were stronger during the last glacial. Other records from arid Central Asia also indicate that the westerlies weakened during the early Holocene (Chen et al, 2016).…”

Section: Resultsmentioning

confidence: 66%

Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China

Zheng

Pancost

Liu

et al. 2017

Geology

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Variations in atmospheric circulation across the last deglaciation in the northernmost monsoon-influenced regions of Asia are not well constrained, highlighting a fundamental gap in our understanding of Asian climate. Here we reconstruct continental air temperatures for northeast China across the last deglaciation (past 16 k.y.), based on the distribution of bacterial branched glycerol dialkyl glycerol tetraethers in a sequence of the Hani peat (Jilin Province, northeast China). Our results indicate large (as much as 10 °C) oscillations in temperature in northeast China across the deglaciation, oscillations significantly larger than observed in other temperature records from low-latitude or same-latitude East Asia, but consistent with climate model simulations. This enhanced magnitude, as well as the timing of temperature variations, provides evidence for atmospheric teleconnections with high latitudes; in particular, we suggest that highlatitude cooling associated with Arctic ice expansion and changes in Atlantic Meridional Overturning Circulation enhanced the intensity and lowered the temperature of Eurasian mid-latitude westerlies and northwesterly winds over East Asia during the last glacial, delivering cold air masses to northeast China. During the deglaciation the westerlies and therefore delivery of cold air masses weakened, amplifying the deglacial warming in this region. We conclude that changes in North Atlantic climate had a particularly strong impact on the northernmost parts of the East Asian monsoon-influenced area.

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“…Modal grain sizes in this range (ca. 75 µm) are common in loess along the Huangshui and Yellow rivers in China (Prins et al, 2009;Vandenberghe et al, 2006;Vriend and Prins, 2005), the Danube and Tisza rivers in Serbia (Bokhorst et al, 2011), and the Mississippi valley in the USA (Jacobs et al, 2011). Since this fraction is interpreted to originate from proximal sources, the grain size of the available source material, rather than wind energy, plays a more important role in the presence and proportions of this grain size (Vandenberghe, 2013).…”

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

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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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Penetration of Atlantic westerly winds into Central and East Asia

Cited by 177 publications

References 39 publications

Asynchronous evolution of the Indian and East Asian Summer Monsoon indicated by Holocene moisture patterns in monsoonal central Asia

Asynchronous evolution of the Indian and East Asian Summer Monsoon indicated by Holocene moisture patterns in monsoonal central Asia

Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China

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

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