Abstract
Glacial-interglacial variations in CO 2 and methane in polar ice cores have been attributed, in part, to changes in global wetland extent, but the wetland distribution before the Last Glacial Maximum (LGM, 21 ka to 18 ka) remains virtually unknown. We present a study of global peatland extent and carbon (C) stocks through the last glacial cycle (130 ka to present) using a newly compiled database of 1,063 detailed stratigraphic records of peat deposits buried by mineral sediments, as well as a global peatland model. Quantitative agreement between modeling and observations shows extensive peat accumulation before the LGM in northern latitudes (>40 ° N), particularly during warmer periods including the last interglacial (130 ka to 116 ka, MIS 5e) and the interstadial (57 ka to 29 ka, MIS 3). During cooling periods of glacial advance and permafrost formation, the burial of northern peatlands by glaciers and mineral sediments decreased active peatland extent, thickness, and modeled C stocks by 70 to 90% from warmer times. Tropical peatland extent and C stocks show little temporal variation throughout the study period. While the increased burial of northern peats was correlated with cooling periods, the burial of tropical peat was predominately driven by changes in sea level and regional hydrology. Peat burial by mineral sediments represents a mechanism for long-term terrestrial C storage in the Earth system. These results show that northern peatlands accumulate significant C stocks during warmer times, indicating their potential for C sequestration during the warming Anthropocene.
Original language | English |
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Pages (from-to) | 4822-4827 |
Number of pages | 6 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 116 |
Issue number | 11 |
DOIs | |
State | Published - 2019 |
Externally published | Yes |
Funding
We thank S. Frolking for helpful discussion. C.C.T. was supported by the Max Planck Institute for Meteorology, National Science Foundation (NSF) Award ARC-1304823, Academy of Finland (CAPTURE Project). T.K. was supported by the German Ministry of Education and Research (BMBF) Grants 03G0836C and 01LP1507B. T.A.D. was supported by the US Army Engineer Research and Development Center Basic Research (6.1) and Strategic Environmental Research and Development Programs. S.A.F., T.L., and J.T. were supported by the Natural Sciences and Engineering Research Council of Canada. G.G. and J.S. were supported by the European Research Council (Grants 338335 and HGF ERC-0013). M.C.J. was supported by U.S. Geological Survey Climate and Land Use Research Program and NSF Award ARC-1304823. J.M.S., Z.X., and Z.Y. were supported by NSF (Awards ARC-1107981, PLR-1246190, and EAR-1502891). R.J.P. was supported by the Russian Science Foundation (Grant 14-14-00891). This work is the result of a Past Global Changes Carbon in Peat on Earth through Time (PAGES C-PEAT) working group. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US government. ACKNOWLEDGMENTS. We thank S. Frolking for helpful discussion. C.C.T. was supported by the Max Planck Institute for Meteorology, National Science Foundation (NSF) Award ARC-1304823, Academy of Finland (CAPTURE Project). T.K. was supported by the German Ministry of Education and Research (BMBF) Grants 03G0836C and 01LP1507B. T.A.D. was supported by the US Army Engineer Research and Development Center Basic Research (6.1) and Strategic Environmental Research and Development Programs. S.A.F., T.L., and J.T. were supported by the Natural Sciences and Engineering Research Council of Canada. G.G. and J.S. were supported by the European Research Council (Grants 338335 and HGF ERC-0013). M.C.J. was supported by U.S. Geological Survey Climate and Land Use Research Program and NSF Award ARC-1304823. J.M.S., Z.X., and Z.Y. were supported by NSF (Awards ARC-1107981, PLR-1246190, and EAR-1502891). R.J.P. was supported by the Russian Science Foundation (Grant 14-14-00891). This work is the result of a Past Global Changes Carbon in Peat on Earth through Time (PAGES C-PEAT) working group. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US government.
Keywords
- Carbon
- Carbon burial
- Methane
- Peatlands
- Quaternary