Sedimentary record from Lake Hovsgol, NW Mongolia: Results from the HDP-04 and HDP-06 drill cores

doi:10.1016/j.quaint.2009.02.008

Cited by 28 publications

(2 citation statements)

References 24 publications

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“…Similar variations in isotopic, geochemical, and biogenic parameters were found in the bottom sediments of some water bodies in northern and northwestern Mongolia, for example, Lake Huvsgul [110][111][112][113][114][115][116][117][118][119]. Vosel [120] studied the bottom sediments of the small lakes of the Baikal region.…”

Section: Continental Freshwater Bodiesmentioning

confidence: 81%

Non-Equilibrium Uranium as an Indicator of Global Climate Variations—The World Ocean and Large Lakes

Tokarev

Yakovlev

2021

Water

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In natural water, as a rule, there is a violation of radioactive equilibrium in the chain 238U … → 234U → 230Th →. Groundwater usually has a 234U/238U ratio in the range of 0.8–3.0 (by activity). However, in some regions, the 234U/238U ratio reaches >10 and up to 50. Ultrahigh excesses of 234U can be explained by climatic variations. During a cold period, minerals accumulate 234U as a normal component of the radioactive chain, and after the melting of permafrost, it is lost from the mineral lattice faster than 238U due to its higher geochemical mobility. This hypothesis was tested using data on the isotopic composition of uranium in the chemo- and bio-genic formations of the World Ocean and large lakes, which are reservoirs that accumulate continental runoff. The World Ocean has the most significant 234U enrichments in the polar and inland seas during periods of climatic warming in the Late Pleistocene and Holocene. In the bottom sediments of Lake Baikal, the 234U/238U ratio also increases during warm periods and significantly exceeds the 234U excess of the World Ocean. Furthermore, the 234U/238U ratio in the water of Lake Baikal and its tributaries increases from north to south following a decrease in the area of the continuous permafrost and has a seasonal variation with a maximum 234U/238U ratio in summer. The behavior of 234U in large water reservoirs is consistent with the hypothesis about the decisive influence of permafrost degradation on the anomalies in 234U/238U ratios in groundwater.

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Section: Continental Freshwater Bodiesmentioning

confidence: 81%

Non-Equilibrium Uranium as an Indicator of Global Climate Variations—The World Ocean and Large Lakes

Tokarev

Yakovlev

2021

Water

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“…Studies at multiple other lakes in the region added valuable information, for example, for Khar Nuur, Telmen Nuur, and Ugii Nuur [60][61][62][63][64][65][66][67]. In northern Mongolia, the Khuvsgul and Darkhad regions became the focus of lake research [68][69][70][71][72][73][74][75][76][77][78]. Japanese expeditions retrieved cores from the deepest part of the lake [79][80][81][82][83].…”

Section: Paleolimnologymentioning

confidence: 99%

Glacial Lakes of Mongolia

Walther,

Kamp,

Nandintsetseg

et al. 2024

Geographies

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The over 2200 lakes of Mongolia are generally poorly studied, particularly the glacial lakes. This overview study presents a classification of the glacial lakes based on tectonic-geological and geomorphological dynamics. Selected representative lakes are described using results from fieldwork and satellite image analysis, including bathymetry, paleoshorelines, and recent lake-level fluctuations between 1987 and 2020. Generally, lake levels dropped from the early Holocene until recently, with the onset of the climate change-driven glacier recession that has resulted in lake-level rises and area expansion in almost all moraine-dammed, tongue-basin, and ice-contact lakes. In contrast, endorheic lakes have mainly been shrinking for the past forty years because of an increase in air temperature and evaporation rates and the effects of an intensifying water use within the catchment for irrigation, mining, and hydroelectric energy production in the form of dams. The creation of a lake monitoring system based on an in-depth inventory is recommended.

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