Basin-wide sedimentation changes and deglacial lake-level rise in the Hovsgol basin, NW Mongolia

Prokopenko, Alexander A.; Kuzmin, M. I.; Williams, Douglas F.; Gelety, V. F.; Kalmychkov, G. V.; Gvozdkov, Alexander A; Solotchin, P. A.

doi:10.1016/j.quaint.2004.11.008

Cited by 70 publications

(36 citation statements)

References 11 publications

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“…Apparently, it is expected that the Borsog Bay has been already covered by lake water by the 7.8 kyr cal BP. It is corresponded with the note by Prokopenko et al (2005) as the Lake Khuvsgul evolved from a lowlevel closed basin lake to an overfl owing freshwater lake by the beginning of the Holocene. This hypothesis is apparently supported by the 12.3 m lacustrine sequence for the core BB03 on Borsog Bay throughout the Holocene, i.e., the lacustrine sedimentation on Borsog Bay reveals the quite different feature due to its littoral location as compared to the records from the pelagic parts in the Lake Khuvsgul during the entire Holocene.…”

Section: Discussionsupporting

confidence: 67%

“…A record on annually laminated lake sediments from Lake Khuvsgul, a mountain lake in the northern part of Mongolia,that directly registers environmental change, can be a high resolution archive for a reconstruction of paleoenvironmental changes and for consideration lacustrine sedimentation induced by climatic-hydraulic factors. It has been remarkably confi rmed as a very unique region for reconstructing the paleoclimatic and paleoenvironmental changes in the continental interior of East Eurasia (Kuzmin et al 2000;Krivonogov et al 2003;Prokopenko et al 2005;Goulden et al 2007). However, to reveal the lacustrine sedimentation, a high-resolution record of the hydro-geomorphic evolutions is needed.…”

Section: Introductionmentioning

confidence: 99%

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Sedimentary feature on Borsog Bay, eastern shore of Lake Khuvsgul in Northern Mongolia

Orkhonselenge¹,

Kashiwaya²

2010

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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Abstract:Sedimentary feature on Borsog Bay, eastern shore of Lake Khuvsgul in Northern Mongolia. This study reports on the sedimentary characteristics of Lake Khuvsgul which is located at the southern end of the Baikal Rift System within the continental interior of East Eurasia. With an elevation of 1645 m a.s.l., it has a climate that is mainly controlled by the Siberian-Mongolian high pressure system and the westerly wind systems from the Atlantic Ocean. Lake Khuvsgul, Mongolia's second largest lake by surface area (2760 km 2 ), is the country's deepest fresh water lake with a bottom that is only 262 m a.s.l. Fed by 96 rivers and streams, it is drained by the Eg River which, after joining the Selenge River, fl ows into Lake Baikal. Analysis of a 12.3 m core from Borsog Bay near the eastern shore of the lake indicates a sedimentation rate of about 0.08 cm/a. It is believed that this relatively high sedimentation rate is due to the large sedimentary input from River Borsog and the variability of the turbidity currents at depths shallower than 9 m. It further suggests that the large sedimentation rate may be correlated with the annual and seasonal variations in the dominant westerly wind system over the Siberian Plateau. Such variations have resulted in a lowering of lake level and impacted the rate of erosion within the river's catchment area and therefore the sediment input to the lake. Because this is a preliminary report, further research into the sedimentary dynamics within Lake Khuvsgul and the role played in those dynamics by the climatic variability over Mongolia and Central Asia is planned.

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Section: Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Sedimentary feature on Borsog Bay, eastern shore of Lake Khuvsgul in Northern Mongolia

Orkhonselenge¹,

Kashiwaya²

2010

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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“…The uppermost BSi concentration may therefore not reflect the overall balance between BSi sedimentation and removal via dissolution and porewater-lake water exchange. Finally, spatially variable BSi concentrations, super-imposed on sediment focussing patterns, are observed in some large lakes (Conley et al 1986;Prokopenko et al 2005;Johnson et al 2000;Stager and Johnson 2000) and in our new C BSi data, which is attributable to production or preservation differences among lake regions. In our dataset, 13 lakes include two or more cores that can test the severity of these problems.…”

Section: Bsi Accumulation Ratesmentioning

confidence: 51%

Lack of steady-state in the global biogeochemical Si cycle: emerging evidence from lake Si sequestration

et al. 2014

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Weathering of silicate minerals releases dissolved silicate (DSi) to the soil-vegetation system. Accumulation and recycling of this DSi by terrestrial ecosystems creates a pool of reactive Si on the continents that buffers DSi export to the ocean. Human perturbations to the functioning of the buffer have been a recent research focus, yet a common assumption is that the continental Si cycle is at steadystate. However, we have no good idea of the timescales of ecosystem Si pool equilibration with their environments. A review of modelling and geochemical considerations suggests the modern continental Si cycle is in fact characterised in the longterm by an active accumulation of reactive Si, at least partially attributable to lakes and reservoirs. These lentic systems accumulate Si via biological conversion of DSi to biogenic silica (BSi). An analysis of new and published data for nearly 700 systems is presented to assess their contribution to the accumulating continental pool. Surface sediment BSi concentrations (n = 692) vary between zero and [60 % SiO 2 by weight, apparently independently of lake size, location or water chemistry. Using sediment core BSi accumulation rates (n = 109), still no relationships are found with lake or catchment parameters. However, issues associated with single-core accumulation rates should in any case preclude their use in elemental accumulation calculations. Based on lake/reservoir mass-balances (n = 34), our best global-scale estimate of combined lake and reservoir Si retention is 1.53 TMol year -1 , or 21-27 % of river DSi export. Again, no scalable relationships are apparent, suggesting Si retention is a complex process that varies from catchment to catchment. The lake Si sink has implications for estimation of weathering flux generation from river chemistry. The size of the total continental Si pool is poorly constrained, as is its accumulation rate, but lakes clearly contribute substantially. A corollary to this emerging understanding is that the flux and isotopic composition of DSi delivered to the ocean has likely varied over time, partly mediated by a fluctuating continental pool, including in lakes.

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“…Along the north-eastern coast the underwater river channel fills are indicative of a lower lake level prior to 15 ka BP , confirming our assumption. At the same time, enhanced evaporation linked to increased aridity in inner Asia (Karabanov et al, 2004;Goldberg et al, 2010) resulted in a lowering of the water level of lakes in Mongolia (Prokopenko et al, 2005) and China (Kramer et al, 2010).…”

Section: The Lgm and Late Glacial Diatom Isotope Record And Lacustrinmentioning

confidence: 99%

The last glacial maximum and late glacial environmental and climate dynamics in the Baikal region inferred from an oxygen isotope record of lacustrine diatom silica

Kostrova

Meyer

Chapligin

et al. 2014

Quaternary International

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a b s t r a c tThe last glacial maximum and late glacial environmental and climatic variability in the Baikal region, southern Siberia, Russia has been studied in a sediment sequence from Lake Kotokel, located 2 km east of Lake Baikal, using the oxygen isotope composition of diatom silica (d 18 O diatom ). The purification of diatom frustules involved the process of trimethylsilylation, which has been shown to be suitable for preparation of diatoms for oxygen isotope analysis. The Lake Kotokel d 18O diatom record presented here spans intervals from about 24.6 to 22.9 ka BP (further referred to as 'last glacial maximum') and~16.7e11.5 ka BP (further referred to as 'late glacial') displaying variations in the oxygen isotope composition between þ26.7 and þ31.2‰. Overall high d18 O diatom values of about þ29 to þ31‰ during the two investigated intervals characterize a strongly evaporative lake system in a dry environment and suggest a lower than present lake level due to enhanced evaporation. The Lake Kotokel diatom isotope record is roughly in line with the 60 N summer solar insolation, pointing to a linkage to broader-scale climate change, but displays weaker reaction to short-term climatic oscillations, i.e. Bølling-Allerød or Younger Dryas. The climate warming at~14.3 ka BP is marked by negative spikes in the d18 O diatom record due to isotopically low melt water input from the mountainous hinterland.

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Basin-wide sedimentation changes and deglacial lake-level rise in the Hovsgol basin, NW Mongolia

Cited by 70 publications

References 11 publications

Sedimentary feature on Borsog Bay, eastern shore of Lake Khuvsgul in Northern Mongolia

Sedimentary feature on Borsog Bay, eastern shore of Lake Khuvsgul in Northern Mongolia

Lack of steady-state in the global biogeochemical Si cycle: emerging evidence from lake Si sequestration

The last glacial maximum and late glacial environmental and climate dynamics in the Baikal region inferred from an oxygen isotope record of lacustrine diatom silica

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