Control of wind strength and frequency in the Aral Sea basin during the late Holocene

Sorrel, Philippe; Oberhänsli, Hedi; Boroffka, Nikolaus; Нургалиев, Д. К.; Dulski, Peter; Röhl, Ursula

doi:10.1016/j.yqres.2006.12.003

Cited by 40 publications

(33 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…New data reflecting environmental changes in the Aral Sea region over the last 2000 yr were obtained Boroffka et al 2005Boroffka et al , 2006Sorrel et al 2006Sorrel et al , 2007Oberhähsli et al 2007;Reinhardt et al 2008). However, 14 C results from these studies were inconsistent (Sorrel et al 2006:308).…”

Section: Resume Of Previous Studies Of the Aral Sea Historymentioning

confidence: 99%

Environmental Changes of the Aral Sea (Central Asia) in the Holocene: Major Trends

et al. 2010

View full text Add to dashboard Cite

ABSTRACT. Changes of the Aral Sea level have been observed in 3 sediment boreholes, 2 outcrops, and associated archaeological sites. The obtained results are supported by 25 radiocarbon dates. Major trends of lake-level changes have been reconstructed in some detail for the last 2000 yr, and additional data provide an outline of fluctuations throughout the Holocene. Several distinct changes are shown to precede the modern, human-induced regression of the Aral Sea. These include: 1) the latest maximum in the 16th-20th centuries AD (53 m asl); 2) a Medieval "Kerderi" minimum of the 12th-15th centuries AD (29 m asl); 3) the early Medieval maximum of the 4th-11th centuries AD (52 m asl); and 4) a near BC/AD lowstand, whose level is not well established. Since then, events are only inferred from sparse data. The studied cores contain several sandy layers representing the lowering of the lake level within the Holocene, including the buried shore-bar of ~4500 cal BP (38 m asl), and shallow-water sediments of ~5600 cal BP (44 m asl), 7200 cal BP (28 m asl), and 8000 cal BP (26.5 m asl).

show abstract

Section: Resume Of Previous Studies Of the Aral Sea Historymentioning

confidence: 99%

Environmental Changes of the Aral Sea (Central Asia) in the Holocene: Major Trends

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The Siberian anticyclone dominates winter and spring climate over Eurasia (Gong and Ho, 2002;Obreht et al, 2017;Panagiotopoulos et al, 2005;Sahsamanoglou et al, 1991). Although the influence of the Siberian High has been shown to decrease westward from the CLP (Vandenberghe et al, 2006), wind strength and frequency over the Aral Sea in western central Asia during the Holocene was nevertheless associated with the intensity of the Siberian High pressure system (Feng et al, 2011;Sorrel et al, 2007). Obreht et al (2017) even hypothesized increased influence of the Siberian High during MIS 3 over the Lower Danube Basin in SE Europe, although this has yet to be substantiated.…”

mentioning

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

“…(a, b) Wind strength records of the WS (Z‐score values of Ti abundance in Aral Sea sediments and Ca content in Geladaindong ice core) [ Sorrel et al ., ; Grigholm et al ., ] and (c) IM (Z‐score value of G . bulloides content in Arabian Sea sediments) [ Anderson et al ., ] on the TP and its periphery (see supporting information Table S2).…”

Section: Resultsmentioning

confidence: 99%

Rapid northward shift of the Indian Monsoon on the Tibetan Plateau at the end of the Little Ice Age

Zhang

Günther

et al. 2017

JGR Atmospheres

View full text Add to dashboard Cite

Variations in the Indian Monsoon (IM) and Westerlies (WS) significantly affect the climate on the Tibetan Plateau (TP) and have widespread ecological and socioeconomic impacts on the whole of Asian society. So far, however, the rate and magnitude of changes in the IM have still remained unclear. Here we report for the first time that the IM rapidly shifted northward at the end of the Little Ice Age (LIA). We used sediment proxies for humidity and moisture sources from the Taro Co Lake, which is located in the transition zone between the WS and IM. Our comprehensive survey of climate records for the TP and its peripheral mountain ranges revealed that the northern boundary of the IM (i.e., the southern boundary of the WS) lay along the southern slope of the Gandise Range (~29.5°N) in the late LIA. In contrast, it passed quickly over the Gandise Range by at least 1.5° in latitude at the end of the LIA. Our results suggest that this rapid climatic shift was potentially triggered by the counteracting effects of blocking by the TP and its marginal orography, which hindered the northward movement of the IM, and the pulling thermal gradient of the TP.

show abstract

Control of wind strength and frequency in the Aral Sea basin during the late Holocene

Cited by 40 publications

References 39 publications

Environmental Changes of the Aral Sea (Central Asia) in the Holocene: Major Trends

Environmental Changes of the Aral Sea (Central Asia) in the Holocene: Major Trends

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

Rapid northward shift of the Indian Monsoon on the Tibetan Plateau at the end of the Little Ice Age

Contact Info

Product

Resources

About