Proxy value of n-alkan-2-ones in the Hongyuan peat sequence to reconstruct Holocene climate changes on the eastern margin of the Tibetan Plateau
Proxy value of n-alkan-2-ones in the Hongyuan peat sequence to reconstruct Holocene climate changes on the eastern margin of the Tibetan Plateau
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红源泥炭序列中n-alkan-2-ones重建青藏高原东缘全新世气候变化的代理价值
DOI：
10.1016/j.chemgeo.2011.06.011
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发表时间：
2011-09
期刊：
影响因子：
3.9
通讯作者：
Yanhong Zheng, Weijian Zhou,Philip A. Meyers
中科院分区：
文献类型：
--
作者：
Yanhong Zheng, Weijian Zhou,Philip A. Meyers
对青藏高原东缘红原泥炭岩芯中的N-烷基-2-酮进行了调查，以评价其组成在过去13,500年间变化的古气候代用价值。在整个泥炭序列中发现了一系列从C19到C31的同源化合物，在C23处达到最大值，并显示出强烈的奇偶碳链长度优势。为了帮助评估红原泥炭岩芯中正构烷烃-2-酮可能的古气候价值，我们将我们的分子结果与同一序列中的花粉记录进行了比较。结果表明，冷杉/莎草科(冷杉/莎草科)比值(冷杉/莎草科)揭示的季风降水量过去的变化也被记录在n-烷kan-2-one(C23+C25)/(C27+C29+C31)-KET比值和CPI-KET(碳偏好指数)值中。正构烷烃和正构烷酸比值的地层变化表明，在n-烷基-2-酮的丰度中，记录了对水分敏感的微生物对奇数链正构烷烃的α氧化和偶数链长正构烷酸的脱羧基的变化。千年尺度上季风雨强度的变化在n-烷基-2-酮代用品中也很明显，表明它们在泥炭序列中的变化与受亚洲季风控制的微生物活动的变化有关。
n-Alkan-2-ones in the Hongyuan peat core from the eastern margin of the Tibetan Plateau were investigated to assess the paleoclimate proxy value of variations in their compositions over the last 13,500calyears. A homologous series of these compounds that ranged from C19to C31was identified throughout the peat sequence, maximizing at C23and showing a strong odd-over-even carbon chain length predominance. To help evaluate the possible paleoclimatic value of the n-alkan-2-ones in the Hongyuan peat core, we compared our molecular results with the pollen records from the same sequence. Results show that past changes in monsoon precipitation amounts as revealed by the ratio of Abies/Cyperaceae (firs/sedges) are also recorded in the n-alkan-2-one (C23+C25)/(C27+C29+C31)-KET ratio and CPI-KET (Carbon Preference Index) value. Stratigraphic variations of n-alkane and n-alkanoic acid ratios suggest that changes in the moisture-sensitive microbial α-oxidation of odd-chain n-alkanes and decarboxylation of even-chain length n-alkanoic acids is recorded in the abundance of n-alkan-2-ones. Changes in the monsoon rain intensity on millennial scales are also evident in the n-alkan-2-one proxies, indicating that their variations in the peat sequence are correlative with changes in microbial activity controlled by the Asian monsoon.
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影响因子：
5.8
作者：
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通讯作者：
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影响因子：
3
作者：
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影响因子：
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作者：
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通讯作者：
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