Abrupt increase in precipitation and weathering of soils in East Siberia coincident with the end of the last glaciation (15 cal kyr BP)

Чебыкин, Е. П.; Edgington, D.N.; Грачев, М.А.; Zheleznyakova, T. O.; Vorobyova, Svetlana S.; Kulikova, N.S.; Azarova, I. N.; Khlystov, Oleg; Goldberg, E.L.

doi:10.1016/s0012-821x(02)00588-5

Cited by 40 publications

(16 citation statements)

References 18 publications

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“…Indeed, the change at ca. 15 ka corresponds to the onset of wet and warmer conditions associated with abrupt increase in precipitation and strong winds in Siberia, which in turn may have promoted deep mixing and nutrient regeneration in the lake (Bradbury et al, 1994;Chebykin et al, 2002). In the Continent core, CON01-603-5, the evolution of MS signal correlates well with the interpretation of the onset of the warming at ca.…”

Section: Termination I (Ois2/ois1)supporting

confidence: 52%

High-resolution diatom/clay record in Lake Baikal from grey scale, and magnetic susceptibility over Holocene and Termination I

Boës

Piotrowska

Fagel

2005

Global and Planetary Change

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Abstract:Tracing past climate signals from Lake Baikal sediments with a "multi-annual" resolution by conventional techniques is a difficult challenge since the sedimentation rates from Termination I up to the present range from 0.004 to 0.17 mm/year. In this paper, climate signals are reconstructed from three continuous sediment records from Vydrino Shoulder and Posolsky Bank in the Southern Basin, and Continent Ridge in the Northern Basin. For each coring site, a calendar age model was constructed using calibrated radiocarbon ages. The magnetic susceptibility is used to better constrain the age models over OIS4 to OIS1. The cores have been hardened using polymerized technique in order to allow the easy cut of thin sections that contain evidence for narrow biogenic/clayey laminations. The grey scale taken from the thin sections is used here as a high-resolution proxy record of diatom/clay ratio. The grey density values are qualitatively interpreted against the sediment components by optical microscopy from the thin sections. In the Northern Basin, the Continent station provides the best age model and sediment resolution over the Termination I period. In particular, four optima (i.e. Bölling, Alleröd, Atlantic, and Subboreal) are indicated by substantial increases of the grey scale, whereas cold periods like the Younger Dryas correspond to lower grey scale values. We emphasize that the short-term variations in the grey scale at 20 µm resolution could correspond to short climate responses in Lake Baikal sediments.

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Section: Termination I (Ois2/ois1)supporting

confidence: 52%

High-resolution diatom/clay record in Lake Baikal from grey scale, and magnetic susceptibility over Holocene and Termination I

Boës

Piotrowska

Fagel

2005

Global and Planetary Change

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“…A slow and irregular increase in diatom abundance was observed in Lake Baikal sediments since the Late Glacial/Holocene transition (Karabanov et al, 2000;Chebykin et al, 2002). The highest diatom content was observed locally during the Subboreal period (Karabanov et al, 2000).…”

Section: Holocene Intervalmentioning

confidence: 97%

“…1) the diatom population declined almost to full glacial levels and was replaced by chrysophyte algae (Karabanov et al, 2004). Likewise, Chebykin et al (2002) evidenced on Posolsky Bank a decrease of nutrient flux which resulted in a decline in diatom abundance during the Younger Dryas.…”

Section: Late Glacial/holocene Transitionmentioning

confidence: 97%

“…Fig. 2A,B), and diatom-derived palaeoproductivity curves from Lake Baikal sedimentary records (e.g., Karabanov et al, 2000;Chebykin et al, 2002;Karabanov et al, 2004). In the following discussion we will focus on the common time interval recorded in both pilot cores, i.e., the last 14 kyr.…”

Section: Palaeoclimate Significance Of Clay Changesmentioning

confidence: 99%

“…The high-frequency fluctuations in the diatom curve indicate instability in diatom production, related to climate instability according to Karabanov et al (2000). Chebykin et al (2002) suggested that the irregular rate of diatom production was rather controlled by the slow process of formation of new soils and weathering of rocks in the catchment. The slow diatom recovery may be a consequence of the gradual weathering of Holocene soils.…”

Section: Holocene Intervalmentioning

confidence: 99%

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Clay-mineral record in Lake Baikal sediments: The Holocene and Late Glacial transition

Fagel

Boës

2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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Abstract:We analyse the clay-mineralogical composition of two 1-m long cores from elevated plateaus in the southern and northern basins of Lake Baikal. Our aim is to test the limits of classically used clay proxies for climate reconstructions. Mineralogical signature is determined by X-ray diffraction on oriented aggregates from Holocene and Late Glacial sediments. Mineralogical results are presented on a palaeomagnetic-derived time scale. Sampling at a centimeter resolution allows for a sub-millenial order reconstruction. The evolution of clayderived climate proxies (smectite/illite peak intensity ratio, S/I) is compared between the two locations, with respect to other climate reconstructions for the Lake Baikal area and Siberia. During the Late Glacial punctual increases of S/I are related to changes of particle source rather than any climate change. At both sites the most intense chemical weathering conditions occured during the Subboreal, lagging the Eurasian middle Atlantic climate optimum. S/I follows a gradual but irregular increase through the Holocene, probably related to slow warming favourable to the development of the Siberian soils. The different sensitivity to hydrolysing conditions in northern and southern sites can be explained by a combination of local lithological and topographical parameters.

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A reassessment of late glacial – Holocene diatom oxygen isotope record from Lake Baikal using a geochemical mass‐balance approach

Mackay¹,

Swann

Brewer

et al. 2011

J Quaternary Science

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We present a new palaeoenvironmental record of hydrological variability in Lake Baikal, based on re-modelled d 18 O diatom values of diatom silica (d 18 O modelled ), where the residual contaminants are identified and compensated for using electron optical imaging and whole-sample geochemistry. d 18 O modelled interpretations are based on the balance between rivers with high d 18 O values and rivers with low d 18 O values. Isotopic variability is related to latitudinal differences in precipitation which feed these rivers. The d 18 O modelled record suggests that rather moist conditions prevailed in the Lake Baikal region during the latter stages of the Younger Dryas. Throughout the Holocene, episodes of low d 18 O modelled values are, in general, in good agreement with increases in percentage haematite-stained grains in North Atlantic sediments (indicative of ice-rafted debris events). Rivers with southerly catchments dominate fluvial input especially between c. 3.3 and 2 cal ka BP, concurrent with high precipitation in the Lake Baikal region.

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Abrupt increase in precipitation and weathering of soils in East Siberia coincident with the end of the last glaciation (15 cal kyr BP)

Cited by 40 publications

References 18 publications

High-resolution diatom/clay record in Lake Baikal from grey scale, and magnetic susceptibility over Holocene and Termination I

High-resolution diatom/clay record in Lake Baikal from grey scale, and magnetic susceptibility over Holocene and Termination I

Clay-mineral record in Lake Baikal sediments: The Holocene and Late Glacial transition

A reassessment of late glacial – Holocene diatom oxygen isotope record from Lake Baikal using a geochemical mass‐balance approach

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