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标题：10,000 years of climate control over carbon accumulation in an Iberian bog (southwestern Europe)
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作者：Xabier Pontevedra-Pombal ; Daniel Castro ; Martín Souto 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2019
卷号：10
期号：4
页码：1521-1533
DOI：10.1016/j.gsf.2018.09.014
语种：English
出版社：Elsevier
摘要：AbstractThe northwest region of the Iberian Peninsula is home to a unique ecosystem of bogs, which are particularly sensitive to projected climate change. In this context, the rate of carbon (C) accumulation in Chao de Veiga Mol, an intact raised bog, was analysed. Changes in the accumulation rate over the past 10 millennia were determined in a peat core of 847 cm in depth, with a high mean rate of peat growth (11 yr cm−1, 0.09 cm yr−1). An age-depth model was generated from 2214C dates and fallout radionuclides. Chronological, stratigraphical and physico-chemical data confirmed the existence of a single cycle of peat formation throughout the Holocene and the formation of ombrotrophic peat 9500 years ago. The total mean C content was 50.2%, and over 10 millennia 583 kg C m−2accumulated at a mean rate of 35.3 g C m−2yr−1, with a long-term (apparent) rate of carbon accumulation in the catotelm of 59.9 g C m−2yr−1. These values are much higher than reported for other Iberian peatlands and are amongst the highest documented for peatlands in the northern hemisphere. The dynamics of C accumulation and other measured parameters reveals important variations throughout the Holocene. They could be associated with the main climatic events described in the northern hemisphere and are highly consistent with models established for northern latitudes. The Chao de Veiga Mol raised bog is unique and of great potential value for carrying out high resolution palaeoenvironmental studies, especially in relation to regional and local modulations in southern Europe.Graphical abstractDisplay OmittedHighlights•Analysis of carbon accumulation patterns in a bog of exceptional development in the NW of the Iberian Peninsula.•High resolution record of climate fluctuations and changes in carbon accumulation over 10,000 years in southwestern Europe.•A significant synchrony between the carbon accumulation dynamics and the main holocene climatic phases has been detected.•Coupling to the global model and local modulation in the evolution of the Iberian peatlands.
关键词：KeywordsenPeatlandGeochemistryHoloceneClimate changePalaeoenvironmental reconstruction