Lake Kotokel as a stratotype for the late glacial and Holocene in southeastern Siberia

Безрукова, Е. В.; Krivonogov, Sergey K.; Takahara, Hikaru; Letunova, P. P.; Shichi, Koji; Abzaeva, A.A.; Кулагина, Н. В.; Zabelina, Yu. S.

doi:10.1134/s1028334x08040296

Cited by 43 publications

(27 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…July and August are particularly wet. During these months westerly winds dominating through the year become weak, and southeastern cyclones bring warm and wet Pacific air to the region and cause heavy rainfalls at the eastern branch of the Polar front (Bezrukova et al, 2008). The precipitation associated with the Atlantic air masses brought by the westerly winds is not abundant and mainly falls during autumn and spring.…”

Section: Regional Settingmentioning

confidence: 99%

See 1 more Smart Citation

Late Glacial and Holocene changes in vegetation cover and climate in southern Siberia derived from a 15 kyr long pollen record from Lake Kotokel

2009

Self Cite

View full text Add to dashboard Cite

Abstract. In this study a radiocarbon-dated pollen record from Lake Kotokel (52 • 47 N, 108 • 07 E, 458 m a.s.l.) located in southern Siberia east of Lake Baikal was used to derive quantitative characteristics of regional vegetation and climate from about 15 kyr BP (1 kyr=1000 cal. yr) until today. Quantitative reconstruction of the late glacial vegetation and climate dynamics suggests that open steppe and tundra communities predominated in the study area prior to ca. 13.5 kyr BP and again during the Younger Dryas interval, between 12.8 and 11.6 kyr BP. The pollen-based climate reconstruction suggests lower-than-present mean January (∼−38 • C) and July (∼12 • C) temperatures and annual precipitation (∼270-300 mm) values during these time intervals. Boreal woodland replaced the primarily open landscape around Kotokel three times at about 14.8-14.7 kyr BP, during the Allerød Interstadial between 13.3-12.8 kyr BP and with the onset of the Holocene interglacial between 11.5 and 10.5 kyr BP, presumably in response to a noticeable increase in precipitation, and in July and January temperatures. The maximal spread of the boreal forest (taiga) communities in the region is associated with a warmer and wetter-than-present climate (T w ∼17-18 • C, T c ∼−19 • C, P ann ∼500-550 mm) that occurred ca. 10.8-7.3 kyr BP. During this time interval woody vegetation covered more than 50% of the area within a 21×21 km window around the lake. The pollen-based best modern analogue reconstruction suggests a decrease in woody cover percentages and in all cliCorrespondence to: P. E. Tarasov (ptarasov@zedat.fu-berlin.de) matic variables about 7-6.5 kyr BP. Our results demonstrate a gradual decrease in precipitation and mean January temperature towards their present-day values in the region around Lake Kotokel since that time.

show abstract

Section: Regional Settingmentioning

confidence: 99%

“…In this study we present the quantitative reconstruction of the temperature and precipitation variables derived from the Lake Kotokel pollen record collected in 2004 (Bezrukova et al, 2008). The lake is situated at the eastern shore of Lake Baikal ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Late Glacial and Holocene changes in vegetation cover and climate in southern Siberia derived from a 15 kyr long pollen record from Lake Kotokel

2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…The lake is nearly 15 km long and about 5 km wide with its average depth being equal to 5-6 m with a maximal depth of 14 m. The lake's water runs off to Lake Baikal in the north via the Istok and Turka rivers. The climate is continental with a cold winter and a moderately warm summer (Bezrukova et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

The Microelement Composition of the Soil-Plant Cover in the Basin of Lake Kotokel'

Sosorova¹,

Merkusheva²,

Gyninova³

et al. 2012

ESR

View full text Add to dashboard Cite

The content of microelements (Mn, Zn, Cu, Co, Ni, Cr, Pb, and Cd) and Fe is determined in the soils and plants of the Lake Kotokel' basin. Their content in the soils is proved not to exceed the regional background and the existing MPC and APC. The content of Cd is revealed to exceed its clarke value for the world soils, which is related to the natural origin of this element. The concentrations of Mn, Co, and Pb are close to their clarke values, and those of Zn, Cu, Ni, and Cr are lower than their clarkes. The studied soils are specified by the maximal amount of the mobile forms of microelements. The profile distribution of the microelements differs depending on the genetic soil type. For Mn, Zn, and Cu, a significant biogenic accumulation is pronounced in the organic soil horizons. The content of microelements in the aboveground phytomass exceeds the maximal permissible levels for Mn, Co, Cr, and Fe. The intensity of the microelements absorption by the plants varies widely, being specified by the high coefficient of the biological adsorption (except for Fe). Mn, Zn, and Cu are accumulated in the grass phytomass the most intensely.

show abstract

“…Specifically, the ecosystem of Lake Kotokel located at the taiga/steppe boundary ( Fig. 1) was proven (Bezrukova et al, 2008(Bezrukova et al, , 2010Fedotov et al, 2012;Müller et al, 2014;Shichi et al, 2009;Tarasov et al, 2009) to be highly sensitive to heat and moisture variations. High contents of total organic carbon (TOC) and the absence of the reservoir effect allowed reliable dating of the lake sediments (Bezrukova et al, 2010).…”

mentioning

confidence: 99%

“…In this paper we synthesize partly published (Kostrova et al, 2013a(Kostrova et al, ,b, 2014 and unpublished oxygen isotope data from the most representative Kotokel core KTK2 (Bezrukova et al, 2010); describe the analytical methods; and discuss the responses of the lake system to global change for the past 46 kyr (hereafter the ages are quoted as calibrated using the CalPal curve (http://www.calpal-online.de). The results are compared with the ecological interpretation of spore-pollen and diatom data (Bezrukova et al, 2008;Müller et al, 2014;Shichi et al, 2009;Tarasov et al, 2009). …”

mentioning

confidence: 99%

OXYGEN ISOTOPE COMPOSITION OF DIATOMS FROM SEDIMENTS OF LAKE KOTOKEL (Buryatia)

2016

GiG

View full text Add to dashboard Cite

This is a summary of new oxygen isotope data for diatoms from Lake Kotokel sediments, with implications for responses of the lake system and its environment to global change over the past 46 kyr. Fossil diatoms in all samples are free from visible contamination signatures and contain no more than 2.5% Al 2 O 3 , which ensures reliable reconstructions. The δ 18O values in diatoms vary between +23.7 and +31.2‰ over the record. The results mainly represent diatom assemblages of summer blooming periods, except for the time span between 36 and 32 kyr, when the isotopic signal rather records a shift from summer to spring blooming conditions. Possible water temperature changes only partly explain the changes in the isotopic record. The observed isotopic patterns are produced mainly by isotope changes in lake water in response to variations in air temperature, hydrology, and atmospheric circulation in the region. During Marine Isotope Stage (MIS) 2 (Last Glacial maximum), high δ 18 O diatom resulted from rapid evaporation and low fluvial inputs. The high δ 18O values of about +29 to +30‰ during the first half of MIS 1 (Holocene interglacial) suggest an increased share of summer rainfalls associated with southern/southeastern air transport. The δ 18 O decrease to +24‰ during the second half of MIS 1 is due to the overall hemispheric cooling and increased moisture supply to the area by the Atlantic transport. The record of Lake Kotokel sediments provides an example of complex interplay among several climatic controls of δ 18 O diatom in the Late Pleistocene and the Holocene.

show abstract

Lake Kotokel as a stratotype for the late glacial and Holocene in southeastern Siberia

Cited by 43 publications

References 3 publications

Late Glacial and Holocene changes in vegetation cover and climate in southern Siberia derived from a 15 kyr long pollen record from Lake Kotokel

Late Glacial and Holocene changes in vegetation cover and climate in southern Siberia derived from a 15 kyr long pollen record from Lake Kotokel

The Microelement Composition of the Soil-Plant Cover in the Basin of Lake Kotokel'

OXYGEN ISOTOPE COMPOSITION OF DIATOMS FROM SEDIMENTS OF LAKE KOTOKEL (Buryatia)

Contact Info

Product

Resources

About