Global peatland initiation driven by regionally asynchronous warming

Paul J. Morris*, Graeme T. Swindles, Paul J. Valdes, Ruza F. Ivanovic, Lauren J. Gregoire, Mark W. Smith, Lev Tarasov, Alan M. Haywood, Karen L. Bacon

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    43 Citations (Scopus)
    11 Downloads (Pure)

    Abstract

    Widespread establishment of peatlands since the Last Glacial Maximum represents the activation of a globally important carbon sink, but the drivers of peat initiation are unclear. The role of climate in peat initiation is particularly poorly understood. We used a general circulation model to simulate local changes in climate during the initiation of 1,097 peatlands around the world. We find that peat initiation in deglaciated landscapes in both hemispheres was driven primarily by warming growing seasons, likely through enhanced plant productivity, rather than by any increase in effective precipitation. In Western Siberia, which remained ice-free throughout the last glacial period, the initiation of the world’s largest peatland complex was globally unique in that it was triggered by an increase in effective precipitation that inhibited soil respiration and allowed wetland plant communities to establish. Peat initiation in the tropics was only weakly related to climate change, and appears to have been driven primarily by nonclimatic mechanisms such as waterlogging due to tectonic subsidence. Our findings shed light on the genesis and Holocene climate space of one of the world’s most carbon-dense ecosystem types, with implications for understanding trajectories of ecological change under changing future climates.

    Original languageEnglish
    Pages (from-to)4851-4856
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume115
    Issue number19
    Early online date06 Apr 2018
    DOIs
    Publication statusPublished - 08 May 2018

    Keywords

    • Basal date catalog
    • Bioclimate
    • Biogeography
    • Deglaciation
    • GCM

    ASJC Scopus subject areas

    • General

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