Late glacial vegetation and climate oscillations on the southeastern Tibetan Plateau inferred from the Lake Naleng pollen profile

Kramer, Annette; Herzschuh, Ulrike; Mischke, Steffen; Zhang, Chengjun

doi:10.1016/j.yqres.2009.12.003

Cited by 89 publications

(71 citation statements)

References 88 publications

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“…High-resolution lake sediment records have been obtained from Yidun Lake [6] in southern Tibet and Ren Co [7] in the southeastern Plateau, Yanmdrok Lake [13] in the southern Plateau, and Peiku Co [8] and Zabuye Lake [12] in the southwestern Plateau. Moreover, the recent environmental records of Naleng Lake [31] in the eastern Plateau and Ximen Co [32] are dominated by glacial meltwater supplies, and could be compared with our results, even though both lakes experience the influence of the southeast monsoon. For comparison, all ages were converted from AMS 14 C ages to calendar ages.…”

Section: Comparison With Other Lakes Records In Southern Tibetsupporting

confidence: 52%

A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet

Zhu

Nishimura

et al. 2011

Chin. Sci. Bull.

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A 380-cm-long sediment core was acquired from the deep water area of Pumoyum Co, southern Tibet. Twenty-five plant residue samples were selected, and organic carbon stable isotopes were obtained using the AMS 14 C chronological method. The 14 C age and carbon reservoir effect were calibrated with surface sedimentation rate measurements using 210 Pb dating. Results showed that the core sediment deposited over 19 cal ka BP. Based on a multi-proxy analysis of TOC and IC contents, grain size and pollen assemblage data, the palaeoclimatic evolution of Pumoyum Co was reconstructed since the last glacial. Pumoyum Co was a shallow lake prior to 16.2 cal ka BP; although the glacier around the lake began to melt due to increasing temperatures, climate was still cold and dry. In the interval of 16.2-11.8 cal ka BP, the sedimentary environment fluctuated drastically and frequently. Two cold-events occurred at 14.2 and 11.8 cal ka BP, and these may correspond to the Older Dryas and the Younger Dryas events, respectively. After 11.8 cal ka BP, Pumoyun Co developed into the deep lake as it is now. The lake water temperature was relatively lower at that time because of influx of cold water from glacial meltwater entering the lake. As a result, the multi-proxy indicators showed no sign of warm conditions. Comparisons between the sedimentary record of Pumoyum Co with that of other lakes of the same age in southern Tibet indicate a warmer climate following the last deglaciation influenced the southeastern Tibetan Plateau. These results imply that the southwest Asian monsoon gradually became stronger since the deglaciation during its expansion to the inner plateau. The glacial-supplied water of the lake responded sensitively to cold-events. The entire southern Tibet region was dominantly influenced climatically by the southwest Asian monsoon during the Holocene.Tibet, Pumoyum Co, lake sedimentation, environmental change, high resolution, glacial meltwater Citation:Lü X M, Zhu L P, Nishimura M, et al. A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet.

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Section: Comparison With Other Lakes Records In Southern Tibetsupporting

confidence: 52%

A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet

Zhu

Nishimura

et al. 2011

Chin. Sci. Bull.

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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: 79%

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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“…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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Late glacial vegetation and climate oscillations on the southeastern Tibetan Plateau inferred from the Lake Naleng pollen profile

Cited by 89 publications

References 88 publications

A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet

A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co, southern Tibet

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

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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