DOI: 10.1016/j.quageo.2019.101037
论文题名: Permafrost-related hiatuses in stalagmites: Evaluating the potential for reconstruction of carbon cycle dynamics
作者: Lechleitner F.A. ; Mason A.J. ; Breitenbach S.F.M. ; Vaks A. ; Haghipour N. ; Henderson G.M.
刊名: Quaternary Geochronology
ISSN: 18711014
出版年: 2020
卷: 56 语种: 英语
英文关键词: Carbon cycle
; Permafrost
; Radiocarbon
; Siberia
; Stalagmite/speleothem
; Trace elements
; U-Th dating
Scopus关键词: carbon cycle
; glacial-interglacial cycle
; hiatus
; paleoenvironment
; permafrost
; radiocarbon dating
; reconstruction
; speleothem
; stalagmite
; trace element
; uranium series dating
; Siberia
英文摘要: Permafrost is widely present throughout the Northern Hemisphere high latitudes, and stores large amounts of carbon in the form of frozen soil organic matter. The response of permafrost regions to anthropogenic climate change remains uncertain, in part because of a lack of information on their response to past changes in global climate. Here we test the use of stalagmites from two caves in Siberia as a novel, precisely dated, and highly localised archive of past permafrost carbon cycle dynamics. Stalagmite growth at these sites is controlled by the presence/absence of permafrost above the cave over glacial-interglacial time scales. We target the transition layer between two subsequent growth phases (interglacials) and the interval directly following growth resumption after the last glacial in three stalagmites, as this is where a geochemical imprint of thaw-related processes in the frozen zone between surface and cave would be recorded. We apply a multi-proxy approach including carbon isotopes (δ13C and 14C) and trace element concentrations, combined with petrographic analyses and high-resolution U-Th chronology. Our dataset indicates complex growth patterns and possible intervals of microbial colonisation of the stalagmite surface in the transition layers. High-resolution U-Th ages confirm that the transition layer is not a single, long growth hiatus, but rather a period of extremely slow or episodic growth phases, possibly during “skipped” interglacials. However, we find no conclusive evidence for a geochemical signature related to permafrost degradation and related local carbon cycle dynamics, which might be related to insufficient sensitivity of the archive for high-frequency processes and/or insufficient measurement resolution. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159103
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, United Kingdom; Institute for Geology, Mineralogy & Geophysics, Ruhr-Universität Bochum, Universitätsstrasse 150, Bochum, Germany; Geological Survey of Israel, 32 Yeshayahu Leibowitz Street, Jerusalem, Israel; Department of Earth Sciences, ETH Zurich, Sonneggstrasse 5, Zürich, 8092, Switzerland; Laboratory of Ion Beam Physics, Department of Physics, ETH Zurich, Otto-Stern-Weg 5, Zurich, 8093, Switzerland
Recommended Citation:
Lechleitner F.A.,Mason A.J.,Breitenbach S.F.M.,et al. Permafrost-related hiatuses in stalagmites: Evaluating the potential for reconstruction of carbon cycle dynamics[J]. Quaternary Geochronology,2020-01-01,56