印度南部尼尔吉里高原全新世降水氢同位素值显示降水量和输送路径的综合影响

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
S. Managave, Yongsong Huang, J. Sutra, K. Anupama, S. Prasad
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引用次数: 1

摘要

作为印度重要的古气候档案,尼尔吉里高原泥炭沉积的古气候研究主要局限于植物源物质的碳同位素组成(δ13C)和花粉研究。然而,尚不清楚这些代用物是否反映了过去温度或水文的变化。本文报道了链长为28的正烷酸(δDC28和δ13CC28)的氢和碳同位素变化,并证明了泥炭地叶蜡的氢同位素提供了过去水文的敏感记录。全新世植被校正雨δ13CC28和δD的解耦表明,叶蜡化合物δD主要响应过去的水文变率,而δ13C的变化可能反映C3和C4植被的温控变率。与该区其他古气候记录一致,δDC28的变化表现出早全新世以来降水减少的趋势。然而,印度地区全新世降水δD重建幅值较大(~44‰),表明水汽来源和轨迹的变化可能是影响印度地区代用物轨道尺度δD变化的另一个因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Holocene precipitation hydrogen isotopic values on Nilgiri Plateau (southern India) suggest a combined effect of precipitation amount and transport paths
Paleoclimate investigations of the peat deposits in the Nilgiri Plateau, an important paleoclimate archive of India, are mainly restricted to the carbon isotope composition ((δ13C) of plant-derived materials and pollen studies. However, it is unclear whether these proxies reflect past variability in temperature or hydrology. Here, we report the hydrogen and carbon isotopic variability of n-alkanoic acid of chain length 28 (δDC28 and δ13CC28, respectively) and demonstrate that the peatland leaf wax hydrogen isotopes provide a sensitive record of past hydrology. The decoupling of δ13CC28 and δD of vegetation-corrected rain during the Holocene indicate that δD of the leaf wax compounds mainly respond to past hydrological variability whereas δ13C variations might reflect the temperature-controlled variability of C3 and C4 vegetation. Conforming with the other paleoclimate records from the region, the δDC28 variations showed a reducing precipitation trend since the early Holocene. However, a large amplitude of reconstructed δD of rain (~44‰) during the Holocene indicated changes in the moisture source and trajectory could be an additional factor contributing to the orbital-scale δD variability of proxies from the Indian region.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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