Committed and projected future changes in global peatlands – continued transient model simulations since the Last Glacial Maximum
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Published:2021-06-18
Issue:12
Volume:18
Page:3657-3687
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Müller JurekORCID, Joos FortunatORCID
Abstract
Abstract. Peatlands are diverse wetland ecosystems distributed mostly over the northern latitudes and tropics. Globally they store a large portion of the global soil organic carbon and provide important ecosystem services. The future of these systems under continued anthropogenic warming and direct human disturbance has potentially large impacts on atmospheric CO2 and climate. We performed global long-term projections of peatland area and carbon over the next 5000 years using a dynamic global vegetation model forced with climate anomalies from 10 models of the Coupled Model Intercomparison Project (CMIP6) and three standard future scenarios. These projections are seamlessly continued from a transient simulation from the Last Glacial Maximum to the present to account for the full transient history and are continued beyond 2100 with constant boundary conditions. Our results suggest short to long-term net losses of global peatland area and carbon, with higher losses under higher-emission scenarios. Large parts of today's active northern peatlands are at risk, whereas peatlands in the tropics and, in case of mitigation, eastern Asia and western North America can increase their area and carbon stocks. Factorial simulations reveal committed historical changes and future rising temperature as the main driver of future peatland loss and increasing precipitations as the driver for regional peatland expansion. Additional simulations forced with climate anomalies from a subset of climate models which follow the extended CMIP6 scenarios, transient until 2300, show qualitatively similar results to the standard scenarios but highlight the importance of extended transient future scenarios for long-term carbon cycle projections. The spread between simulations forced with different climate model anomalies suggests a large uncertainty in projected peatland changes due to uncertain climate forcing. Our study highlights the importance of quantifying the future peatland feedback to the climate system and its inclusion into future earth system model projections.
Funder
Horizon 2020 Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Reference175 articles.
1. Ahlström, A., Schurgers, G., and Smith, B.: The large influence of
climate model bias on terrestrial carbon cycle simulations, Environ. Res.
Lett., 12, 014004, https://doi.org/10.1088/1748-9326/12/1/014004, 2017. a 2. Alexandrov, G. A., Brovkin, V. A., and Kleinen, T.: The influence of climate
on peatland extent in Western Siberia since the Last Glacial Maximum, Sci.
Rep., 6, 6–11, https://doi.org/10.1038/srep24784, 2016. a, b 3. Allen, M. R., Frame, D. J., Huntingford, C., Jones, C. D., Lowe, J. A.,
Meinshausen, M., and Meinshausen, N.: Warming caused by cumulative carbon
emissions towards the trillionth tonne, Nature, 458, 1163–1166,
https://doi.org/10.1038/nature08019, 2009. a 4. Avis, C. A., Weaver, A. J., and Meissner, K. J.: Reduction in areal extent of
high-latitude wetlands in response to permafrost thaw, Nat. Geosci., 4,
444–448, https://doi.org/10.1038/ngeo1160, 2011. a 5. Bauer, I. E., Gignac, L. D., and Vitt, D. H.: Development of a peatland
complex in boreal western Canada: Lateral site expansion and local
variability in vegetation succession and long-term peat accumulation, Can.
J. Bot., 81, 833–847, https://doi.org/10.1139/b03-076, 2003. a
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