Climate-related changes in peatland carbon accumulation during the last millenniumReportar como inadecuado

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1 University of Exeter 2 UHM - University of Hawaii at Manoa 3 QUB - Queen-s University Belfast Belfast 4 Lehigh University Bethlehem 5 University of Utah 6 University of Gloucestershire 7 CIMAT - Centro de Investigación en Matemáticas 8 University of Bristol Bristol 9 Lund University Lund 10 Macquarie University 11 University of Southampton Southampton, UK 12 UW - University of Wyoming 13 University of Helsinki Helsinki 14 University of Aberdeen 15 Trinity College Dublin Dublin 16 Imperial College London 17 BIAX Consult NETHERLANDS 18 ECOLAB - Laboratoire Ecologie Fonctionnelle et Environnement - ECOLAB 19 University of Eastern Finland 20 Memorial University of Newfoundland St. John-s 21 UQAM - Université du Québec à Montréal 22 Brown University 23 University of Tartu 24 IKP - Institut für Kernphysik 25 GISS - NASA Goddard Institute for Space Studies 26 Columbia University New York 27 Finnish Forest Research Institute FINLAND 28 UCLA - University of California at Los Angeles Los Angeles 29 Wadia Institute of Himalayan Geology - WIHG INDIA 30 Universität Heidelberg Heidelberg 31 Tallinn University USA 32 University of Leeds 33 Institute for Biodiversity and Ecosystem Dynamics - IBED NETHERLANDS 34 SIU - Southern Illinois University Carbondale 35 CAS - Chinese Academy of Sciences Beijing

Abstract : Peatlands are a major terrestrial carbon store and a persistent natural carbon sink during the Holocene, but there is considerable uncertainty over the fate of peatland carbon in a changing climate. It is generally assumed that higher temperatures will increase peat decay, causing a positive feedback to climate warming and contributing to the global positive carbon cycle feedback. Here we use a new extensive database of peat profiles across northern high latitudes to examine spatial and temporal patterns of carbon accumulation over the past millennium. Opposite to expectations, our results indicate a small negative carbon cycle feedback from past changes in the long-term accumulation rates of northern peatlands. Total carbon accumulated over the last 1000 yr is linearly related to contemporary growing season length and photosynthetically active radiation, suggesting that variability in net primary productivity is more important than decomposition in determining long-term carbon accumulation. Furthermore, northern peatland carbon sequestration rate declined over the climate transition from the Medieval Climate Anomaly MCA to the Little Ice Age LIA, probably because of lower LIA temperatures combined with increased cloudiness suppressing net primary productivity. Other factors including changing moisture status, peatland distribution, fire, nitrogen deposition, permafrost thaw and methane emissions will also influence future peatland carbon cycle feedbacks, but our data suggest that the carbon sequestration rate could increase over many areas of northern peatlands in a warmer future.

keyword : Peat Climate Carbon Little Ice Age

Autor: Dan J. Charman - David W Beilman - Maarten Blaauw - Robert K. Booth - Simon Brewer - Frank M. Chambers - J. Andrés Christen - An



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