A less or more dusty future in the Northern Qinghai-Tibetan Plateau?

Liu, Xingqi; Yu, Zhitong; Dong, Hailiang; Chen, Huei-Fen

doi:10.1038/srep06672

Cited by 51 publications

(36 citation statements)

References 33 publications

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“…6A ). Independent temperature proxies are available for the past 1700 years based on annual varve thickness 49 and TEX 86 50 . All these three datasets were obtained from the same sediment core (5 m long), where no evidence of biodegradation was found over this short time interval 50 .…”

Section: Resultsmentioning

confidence: 99%

Temporal Succession of Ancient Phytoplankton Community in Qinghai Lake and Implication for Paleo-environmental Change

Dong

Hou

et al. 2016

Sci Rep

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Tibetan lake sediments in NW China are sensitive recorders of climate change. However, many important plankton members do not leave any microscopic features in sedimentary records. Here we used ancient DNA preserved in Qinghai Lake sediments to reconstruct the temporal succession of plankton communities in the past 18,500 years. Our results showed that seven classes and sixteen genera of phytoplankton in the lake underwent major temporal changes, in correlation with known climatic events. Trebouxiophyceae and Eustigmatophyceae were predominant during the cold periods, whereas Chlorophyceae, Phaeophyceae, Xanthophyceae, Bacillariophyceae, and Cyanophyceae were abundant during the warm periods. The inferred changes in temperature, nutrients, precipitation, and salinity, as driven by the Westerlies and summer Monsoon strength, likely contributed to these observed temporal changes. Based on these correlations, we propose the phytoplankton index as a proxy to reconstruct the stadial versus interstadial climate change history in Qinghai Lake. This taxon-specific index is free of terrestrial contamination, sensitive to short-term climatic oscillations, and continuous in recording all climatic events in the lake. The validity of this index and its applicability to other lakes is demonstrated by its good correlations with multiple climate records of Qinghai Lake and another lake on the Tibetan Plateau, Kusai Lake.

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Section: Resultsmentioning

confidence: 99%

Temporal Succession of Ancient Phytoplankton Community in Qinghai Lake and Implication for Paleo-environmental Change

Dong

Hou

et al. 2016

Sci Rep

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“…The environment of Qinghai‐Tibetan Plateau (QTP) is highly sensitive to rapid global climatic variability owing to its large size, high altitude, and complex topography, as well as its unique bioclimatic position in relation to influences from Indian summer monsoon (ISM), Eastern Asian summer monsoon (EASM), and westerly circulation [e.g., Shen et al , ; An et al , ; H. Wang et al , ; Thomas et al , , ] (Figure ). Furthermore, it is likely that future climatic variability would be expected to be amplified on the QTP because of cloud‐ and snow‐albedo feedbacks [e.g., Diffenbaugh et al , ; Thomas et al , ] and would possibly have a profound effect on terrestrial ecosystems as well as human societies in the densely populated Eastern Asian continent [e.g., Liu et al , ; Fang et al , ]. As a result, the QTP has been notably invoked as an ideal research focus for paleoclimatologists and paleoecologists, with a variety of proxy records that have been derived from its multiple geological archives such as ice cores [e.g., Thompson et al , ; Du et al , ], lake sediments [e.g., Ji et al , ; Thomas et al , ], tree rings [e.g., Shao et al , ; B. Yang et al ., ], and peat sections [e.g., Hong et al , ; Zhao et al , ].…”

Section: Introductionmentioning

confidence: 99%

Quantitative precipitation estimates for the northeastern Qinghai‐Tibetan Plateau over the last 18,000 years

Dodson

Yan

et al. 2017

JGR Atmospheres

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Quantitative information regarding the long‐term variability of precipitation and vegetation during the period covering both the Late Glacial and the Holocene on the Qinghai‐Tibetan Plateau (QTP) is scarce. Herein, we provide new and numerical reconstructions for annual mean precipitation (PANN) and vegetation history over the last 18,000 years using high‐resolution pollen data from Lakes Dalianhai and Qinghai on the northeastern QTP. Hitherto, five calibration techniques including weighted averaging, weighted average‐partial least squares regression, modern analogue technique, locally weighted weighted averaging regression, and maximum likelihood were first employed to construct robust inference models and to produce reliable PANN estimates on the QTP. The biomization method was applied for reconstructing the vegetation dynamics. The study area was dominated by steppe and characterized with a highly variable, relatively dry climate at ~18,000–11,000 cal years B.P. PANN increased since the early Holocene, obtained a maximum at ~8000–3000 cal years B.P. with coniferous‐temperate mixed forest as the dominant biome, and thereafter declined to present. The PANN reconstructions are broadly consistent with other proxy‐based paleoclimatic records from the northeastern QTP and the northern region of monsoonal China. The possible mechanisms behind the precipitation changes may be tentatively attributed to the internal feedback processes of higher latitude (e.g., North Atlantic) and lower latitude (e.g., subtropical monsoon) competing climatic regimes, which are primarily modulated by solar energy output as the external driving force. These findings may provide important insights into understanding the future Asian precipitation dynamics under the projected global warming.

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“…5). In addition, the work of Liu et al (2014) from Kusai Lake has shown the RE is not constant. Although the varve counting indicates a stable sedimentation rate, the 14 C ages became older than the varve ages in the lower parts of the core, suggesting one RE is not enough to make use of the radiocarbon ages.…”

Section: Possibility Of Applying More Than One Re For Inorganic Carbomentioning

confidence: 97%

“…Age models established using radiocarbon dating of bulk organic matter or carbonate can be verified in a number of ways, e.g. by counting annual laminations if preserved in lake the sediments (Liu et al, 2014) or by dating TPR samples at the same or similar depths of the inorganic samples (Zhou et al, 2015). For the most recent sediments, 210 Pb ages can also be compared with the radiocarbon age model to provide verification.…”

Section: Validation Of the Chronologymentioning

confidence: 99%

Developing inorganic carbon-based radiocarbon chronologies for Holocene lake sediments in arid NW China

Zhang

Qiang

et al. 2016

Quaternary Science Reviews

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Inorganic carbonates are often used to establish radiocarbon (14 C) chronologies for lake sediments when terrestrial plant remains (TPR) are rare or when bulk organic matter is insufficient for dating, a problem that is common for many lakes in arid regions. However, the reservoir effect (RE), as well as old carbon contributed from the lakes catchment make it difficult to establish reliable chronologies. Here we present a systematic study of inorganic 14 C ages of two lake-sediment sequences, one from a small-enclosed saline lake-Lake Gahai in Qaidam Basin, and the other from a large freshwater lake-Lake Bosten in Xinjiang. Modern dissolved inorganic carbon (DIC) of the lakes, paleo-lake sediments exposed in the catchment, and mollusk shells in core sediments from Lake Gahai were dated to assess the RE and the contribution of pre-aged carbon to the old ages in the cores. We propose a statistical regression to assess more than one RE for the 14 C carbonate ages within our sedimentary sequences. Old radiocarbon ages contributed by detrital carbonates were assessed by comparing the ages of mollusk shells with those of carbonates at the same sediment depths. We established the RE of the authigenic component and assessed detrital old carbon contributions to our two sites, and this was used to correct the 14 C ages. Based on this approach, we developed age models for both cores, and tested them using 210 Pb ages in both cores and TPR-based 14 Cages recovered from Lake Bosten. We further tested our age models by comparing carbonate-based oxygen isotope (δ 18 O) records from both lakes to an independently-dated regional speleothem δ 18 O record. Our results suggest if sedimentary sequences are densely dated and the RE and the contribution of old carbon from detrital carbonates can be ascertained, robust chronological frameworks based on carbonate-based 14 C determinations can be established.

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A less or more dusty future in the Northern Qinghai-Tibetan Plateau?

Cited by 51 publications

References 33 publications

Temporal Succession of Ancient Phytoplankton Community in Qinghai Lake and Implication for Paleo-environmental Change

Temporal Succession of Ancient Phytoplankton Community in Qinghai Lake and Implication for Paleo-environmental Change

Quantitative precipitation estimates for the northeastern Qinghai‐Tibetan Plateau over the last 18,000 years

Developing inorganic carbon-based radiocarbon chronologies for Holocene lake sediments in arid NW China

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