Uranium isotopes as proxies of the environmental history of the Lake Baikal watershed (East Siberia) during the past 150ka

Goldberg, E.L.; Чебыкин, Е. П.; Жученко, Н.А.; Vorobyeva, S. S.; Stepanova, O. G.; Khlystov, Oleg; Ivanov, E. V.; Weinberg, Evgeny; Gvozdkov, Alexander A

doi:10.1016/j.palaeo.2009.08.030

Cited by 21 publications

(15 citation statements)

References 93 publications

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“…The high diatom δ 18 O values at 25.0-11.5 kyr BP, when the climate was drier and colder than at present (Bezrukova et al, 2010;Goldberg et al, 2010;Müller et al, 2014;Tarasov et al, 2009), were due to water temperature cooling (see above), as well as to low moisture. Rapid evaporation at mainly clear weather and climate drying associated with cooling in central Asia (Karabanov et al, 2004;Goldberg et al, 2010) led to lake level fall in Mongolia and China (Kramer et al, 2010). The lower lake level in Kotokel during MIS 2 was confirmed by echo sounding data (Zhang et al, 2013).…”

Section: Discussionmentioning

confidence: 91%

Oxygen isotope composition of diatoms from sediments of Lake Kotokel (Buryatia)

Kostrova

Meyer

Tarasov³

et al. 2016

Russian Geology and Geophysics

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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 18 O 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 18 O 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.

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Section: Discussionmentioning

confidence: 91%

Oxygen isotope composition of diatoms from sediments of Lake Kotokel (Buryatia)

Kostrova

Meyer

Tarasov³

et al. 2016

Russian Geology and Geophysics

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“…Rapid evaporation at mainly clear weather and climate drying associated with cooling in central Asia (Karabanov et al, 2004;Goldberg et al, 2010) led to lake level fall in Mongolia and China (Kramer et al, 2010). The lower lake level in Kotokel during MIS 2 was confirmed by echo sounding data (Zhang et al, 2013).…”

mentioning

confidence: 84%

“…18 O values at 25.0-11.5 kyr BP, when the climate was drier and colder than at present (Bezrukova et al, 2010;Goldberg et al, 2010;Müller et al, 2014;Tarasov et al, 2009), were due to water temperature cooling (see above), as well as to low moisture. Rapid evaporation at mainly clear weather and climate drying associated with cooling in central Asia (Karabanov et al, 2004;Goldberg et al, 2010) led to lake level fall in Mongolia and China (Kramer et al, 2010).…”

mentioning

confidence: 86%

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

2016

GiG

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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.

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“…Based on geochemical evidence, Edgington et al also concluded that the variation of uranium concentration in the sediment resulted from changes in the input from the Selenga River and its tributary. The uranium variations are reported to have corresponded to the Pleistocene glacial-interglacial cycles (Chebykin et al, 2007;Edgington et al, 1996;Goldberg et al, 2010) and the Holocene Bond events (Goldberg et al, 2005). The purpose of the present study is to investigate the degree of similarity in the variations in the Lake Baikal records of bioSi and uranium and the paleoproxy records of global climate changes on a centennial-to-millennial-scale as well as a glacial-interglacial time scale.…”

Section: Introductionmentioning

confidence: 92%

“…The variation in the uranium concentration is thought to be due to the weathering intensity in the Selenga drainage basin associated with changes in rainfall/moistures levels (Goldberg et al, 2010;Murakami et al, under review). The U-Th isotope study of Edgington et al (1996Edgington et al ( , 1997 revealed that the uranium in Lake Baikal sediment is composed mainly of authigenic components, which originated in uranium-bearing rocks distributed in Mongolia and southeast Siberia, and that the uranium is transported from the source rock into the lake via the Selenga River.…”

Section: Introductionmentioning

confidence: 99%