globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.08.018
论文题名:
The oxygen and carbon isotopic signatures of biogenic carbonates in Gerzensee, Switzerland, during the rapid warming around 14,685 years BP and the following interstadial
作者: Von Grafenstein U.; Belmecheri S.; Eicher U.; van Raden U.J.; Erlenkeuser H.; Andersen N.; Ammann B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 391
起始页码: 25
结束页码: 32
语种: 英语
英文关键词: Late-glacial ; Ostracods ; Stable isotopes ; Temperature ; Termination 1a
英文摘要: The stable isotope signature of ostracods, molluscs, and charophyte remains from the late glacial section of a shallow core from lake Gerzensee, Switzerland, is analyzed along with the bulk carbonate isotope composition in a multi-proxy study aiming to document the biotic responses to the first strong warming ca. 14.6ka ago after full glacial conditions. The main goal of our contribution is to understand the climatic significance of the oxygen-isotope variations in and between the different carbonate species and ideally provide a quantitative estimate of the oxygen isotopic composition of meteoric precipitation, which then could be translated to mean temperature estimates. Corrected for the respective vital offsets, the different carbonates show almost identical oxygen-isotope ratios for the time preceding and after the rapid transition from Greenland climate stages GS2 to GI1, indicating low and seasonally constant water temperatures at the sediment-water interface for this period. In the following the difference between cold season and warm-season carbonates increases gradually, pointing to a summer-winter temperature difference of roughly 10K at the end of GI1. We conclude that this gradual water-temperature increase is independent of climate and is mainly due to sedimentation, shallowing the sediment-water interface, eventually accentuated by a gradual decrease of Gerzensee's water level during GI1. Corrected for the isotope fractionation induced by the long term trend of such water temperature change, the higher resolved δ18O record from the bulk carbonates allows calculation of the presumed oxygen-isotope ratio of former lake water (δ18OL), which shows striking similarity to the record from Ammersee. Introducing a tentative hydrological correction close to the present day offset between δ18OL and the oxygen-isotopes in meteoric precipitation (δ18OP), we propose a quantitative δ18OP and mean air temperature record for the Gerzensee region. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69574
Appears in Collections:过去全球变化的重建

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作者单位: Laboratoire des Sciences du Climat et de l'Environnement, CNRS CEA, UVSQ, Bat 701, Orme des Merisiers, 91191 Gif-sur-Yvette, France; Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland; Geological Institute, ETH Zürich, Switzerland; Leibniz-Labor für Altersbestimmung und Isotopenforschung, Universität Kiel, Max-Eyth Strasse 11-13, 24118 Kiel, Germany; Oeschger Centre for Climate Change Research, Zaehringerstrasse 25, 3012 Bern, Switzerland

Recommended Citation:
Von Grafenstein U.,Belmecheri S.,Eicher U.,et al. The oxygen and carbon isotopic signatures of biogenic carbonates in Gerzensee, Switzerland, during the rapid warming around 14,685 years BP and the following interstadial[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,391
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