Last glacial–Holocene geochronology of sediment cores from a high-altitude Tibetan lake based on AMS 14C dating of plant fossils: Implications for paleoenvironmental reconstructions

Watanabe, Takahiro; Matsunaka, Tetsuya; Nakamura, Toshio; Nishimura, Mitsugu; Izutsu, Yasuhiro; Minami, Motoyasu; Nara, Fumiko Watanabe; Kakegawa, Takeshi; Wang, Junbo; Zhu, Liping

doi:10.1016/j.chemgeo.2010.07.004

Cited by 41 publications

(27 citation statements)

References 49 publications

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“…This difference indicated that there was a carbon reservoir effect of the sediment, which needed to be excluded. The d 13 C value of the sediment plant residues, which was regarded as a mixture of terrestrial herbs [29,30] and aquatic plants, was -23.2 % (7-8 cm). The age of plant residues in the depth should be older than the actual depositional age.…”

Section: Chronologymentioning

confidence: 99%

Pollen-inferred Holocene vegetation and climate histories in Taro Co, southwestern Tibetan Plateau

Zhu²,

Lü³

et al. 2014

Chin. Sci. Bull.

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Section: Chronologymentioning

confidence: 99%

Pollen-inferred Holocene vegetation and climate histories in Taro Co, southwestern Tibetan Plateau

Zhu²,

Lü³

et al. 2014

Chin. Sci. Bull.

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“…14 C analysis is done by accelerator mass spectrometry, and it can accurately date sediments deposited up to ~50,000 years ago (e.g. Watanabe et al, 2010). This method for lake sediment dating is mostly used to reconstruct large scale environmental changes over several millennia.…”

Section: Radiocarbon Datingmentioning

confidence: 99%

“…For example, Watanabe et al (2010) used a 14 C chronology in high altitude Tibetan lakes to reconstruct major climate boundaries over ~15,000 years. 14 C analysis is made difficult by erroneous 14 C dates due to contamination by young carbon and changes in carbon cycling throughout a core.…”

Section: Radiocarbon Datingmentioning

confidence: 99%

Lead isotopes as particulate contaminant tracers and chronostratigraphic markers in lake sediments in northeastern North America

et al. 2018

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“…According to Watanabe's analysis [21], the content of 14 C in submerged plants (Ruppia, Potamogetonaceae, Charophyceae) in the lake is comparable to that of atmosphere, and the content of 14 C for terrestrial plants generally is in balance with that of the atmosphere. Thus, there is no old carbon on dating of these plant residues.…”

Section: Sediment Core Comparisons and Chronologymentioning

confidence: 99%

“…The 14 C ages obtained from the total organic carbon in the sediment were older than the plant residues of the same layers, which could be interpreted as carbon reservoir effect [21]. To obtain accurate sediment ages, 25 plant residue samples picked out from Core PY608W were identified.…”

Section: Datingmentioning

confidence: 99%

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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Last glacial–Holocene geochronology of sediment cores from a high-altitude Tibetan lake based on AMS 14C dating of plant fossils: Implications for paleoenvironmental reconstructions

Cited by 41 publications

References 49 publications

Pollen-inferred Holocene vegetation and climate histories in Taro Co, southwestern Tibetan Plateau

Pollen-inferred Holocene vegetation and climate histories in Taro Co, southwestern Tibetan Plateau

Lead isotopes as particulate contaminant tracers and chronostratigraphic markers in lake sediments in northeastern North America

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

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