A comparative study of n-alkane biomarker and pollen records: an example from southern China

Zheng, Yongnian; Zhou, Wei; Xie, Shucheng; Yu, Xuefeng

doi:10.1007/s11434-008-0563-3

Cited by 26 publications

(10 citation statements)

References 27 publications

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“…For further comparisons, we use Q grass/plant = C 31 / (C 27 +C 29 +C 31 ) and Q wood/plant = (C 27 +C 29 )/(C 27 +C 29 +C 31 ), to represent the relative n-alkane abundance of grass and woody plants in the samples respectively, because the Q grass/plant and Q wood/plant indices have been widely believed also to represent the relative abundance of grass and woody vegetation [39,50]. n-alkanes, and might reflect local temperature variation [51,52], as well as different vegetation types [32,41,42].…”

Section: N-alkanesmentioning

confidence: 99%

Northern Tibetan Plateau cooling and aridification linked to Cenozoic global cooling: Evidence from n-alkane distributions of Paleogene sedimentary sequences in the Xining Basin

et al. 2011

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The Xining Basin on the northeastern Tibetan Plateau holds the longest continuous Cenozoic stratigraphic record in China. The sequence record contains considerable information on the history of Tibetan uplift and associated climatic change. In particular, high resolution n-alkane biomarker proxy and pollen records have been obtained from the Paleogene sediments of the Xiejia section of the basin. A combination of the n-alkane and palynological records reveals that the paleoclimate in the Xining Basin experienced a long-term cooling trend from 50.2 to 28.2 Ma with a distinctive ecological event spanning 37.5 to 32.7 Ma. Since this ecological event, a vertical zonation of vegetation from lowland arid grasses, to middle-elevation subtropical broad-leaf plants, to high-elevation coniferous trees was established. We interpret that these changes in climate and vegetation were probably responses to a combination of long term global cooling since the Eocene climatic optimum and uplift of the surrounding mountains on the northern Tibetan Plateau in the early Cenozoic.

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Section: N-alkanesmentioning

confidence: 99%

Northern Tibetan Plateau cooling and aridification linked to Cenozoic global cooling: Evidence from n-alkane distributions of Paleogene sedimentary sequences in the Xining Basin

et al. 2011

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“…Chinese peat deposits from the Holocene have received more and more attention in molecular paleoclimate studies over the last decade. Researchers have investigated peat deposits in northeast China [ 15 – 18 ], southwest China [ 19 – 22 ], central China [ 23 – 26 ], and south China [ 27 , 28 ] with lipid biomarker approaches. However, studies of n -alkane δ 13 C and δD values in peat from south China are relatively few.…”

Section: Introductionmentioning

confidence: 99%

Molecular Paleoclimate Reconstructions over the Last 9 ka from a Peat Sequence in South China

et al. 2016

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To achieve a better understanding of Holocene climate change in the monsoon regions of China, we investigated the molecular distributions and carbon and hydrogen isotope compositions (δ13C and δD values) of long-chain n-alkanes in a peat core from the Shiwangutian (SWGT) peatland, south China over the last 9 ka. By comparisons with other climate records, we found that the δ13C values of the long-chain n-alkanes can be a proxy for humidity, while the δD values of the long-chain n-alkanes primarily recorded the moisture source δD signal during 9–1.8 ka BP and responded to the dry climate during 1.8–0.3 ka BP. Together with the average chain length (ACL) and the carbon preference index (CPI) data, the climate evolution over last 9 ka in the SWGT peatland can be divided into three stages. During the first stage (9–5 ka BP), the δ13C values were depleted and CPI and Paq values were low, while ACL values were high. They reveal a period of warm and wet climate, which is regarded as the Holocene optimum. The second stage (5–1.8 ka BP) witnessed a shift to relatively cool and dry climate, as indicated by the more positive δ13C values and lower ACL values. During the third stage (1.8–0.3 ka BP), the δ13C, δD, CPI and Paq values showed marked increase and ACL values varied greatly, implying an abrupt change to cold and dry conditions. This climate pattern corresponds to the broad decline in Asian monsoon intensity through the latter part of the Holocene. Our results do not support a later Holocene optimum in south China as suggested by previous studies.

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“…Previous studies have shown that n-alkanes have an advantage in reflecting environmental changes in peat in the Tibetan Plateau [43]. For instance, dominant plant species may remain unchanged under slight climate variations but their molecular composition may change slightly in response to the variation [44]. Therefore, n-alkane indexes can better reflect the climatic and environmental changes than organic carbon isotopes or other organic indexes and this phenomenon is evident in glacially eroded lake sediments.…”

Section: The N-alkane Indexes From Ximen Co Are Consistent With Tibetmentioning

confidence: 99%

Climatic and environmental implications from n-alkanes in glacially eroded lake sediments in Tibetan Plateau: An example from Ximen Co

Zhang

Wang

et al. 2011

Chin. Sci. Bull.

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A comparative study of n-alkane biomarker and pollen records: an example from southern China

Cited by 26 publications

References 27 publications

Northern Tibetan Plateau cooling and aridification linked to Cenozoic global cooling: Evidence from n-alkane distributions of Paleogene sedimentary sequences in the Xining Basin

Northern Tibetan Plateau cooling and aridification linked to Cenozoic global cooling: Evidence from n-alkane distributions of Paleogene sedimentary sequences in the Xining Basin

Molecular Paleoclimate Reconstructions over the Last 9 ka from a Peat Sequence in South China

Climatic and environmental implications from n-alkanes in glacially eroded lake sediments in Tibetan Plateau: An example from Ximen Co

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