DOI: 10.1016/j.palaeo.2015.03.025
论文题名: A hydroclimate regime shift around 270ka in the western tropical Pacific inferred from a late Quaternary n-alkane chain-length record
作者: Li L. ; Li Q. ; Li J. ; Wang H. ; Dong L. ; Huang Y. ; Wang P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 427 起始页码: 79
结束页码: 88
语种: 英语
英文关键词: Hydrological dynamics
; Late quaternary
; N-Alkanes
; N-Alkanes average chain length
; South China Sea
英文摘要: The inert leaf wax deposited in deep sea sediment preserves clues of the past climate change. In particular, the n-alkane distribution patterns characterized by the n-alkane average chain length index (ACL) provide useful information on the hydrological changes, as longer chain alkanes are more frequently biosynthesized under relatively arid condition to prevent water loss. Our data from the western South China Sea reveal the superimposition of a systematic regime shift in the regional mean precipitation at ca. 420-270. ka on the glacial-interglacial changes in the Quaternary. The dominance of shorter n-alkane chain length between 420. ka and 270. ka is interpreted as overall wetter conditions during this period compared to the older or younger intervals. A similar timing of hydrological regime shifts has also been observed in other paleoclimate records, including major changes in productivity in the eastern Pacific and pollen records from the western Pacific. We suggest that the changes in the regional mean hydroclimate states near 420. ka and 270. ka are most likely related to a regime change in the frequency and/or intensity of the El Niño-Southern Oscillation, with the overall wetter hydroclimate prior to 270. ka resulting in a more prevalent La Niña-like condition in the Pacific. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68948
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; School of Earth and Environmental Sciences, University of AdelaideSA, Australia; Department of Geological Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Li L.,Li Q.,Li J.,et al. A hydroclimate regime shift around 270ka in the western tropical Pacific inferred from a late Quaternary n-alkane chain-length record[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,427