Global peatland dynamics since the Last Glacial Maximum

Details Global peatland dynamics since the Last Glacial Maximum Global peatland dynamics since the Last Glacial Maximum

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713402y&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13402

Physics

12

Biogeosciences: Carbon Cycling (4806), Biogeosciences: Wetlands (1890), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900)

Scientific paper

Here we present a new data synthesis of global peatland ages, area changes, and carbon (C) pool changes since the Last Glacial Maximum, along with a new peatland map and total C pool estimates. The data show different controls of peatland expansion and C accumulation in different regions. We estimate that northern peatlands have accumulated 547 (473-621) GtC, showing maximum accumulation in the early Holocene in response to high summer insolation and strong summer - winter climate seasonality. Tropical peatlands have accumulated 50 (44-55) GtC, with rapid rates about 8000-4000 years ago affected by a high and more stable sea level, a strong summer monsoon, and before the intensification of El Niño. Southern peatlands, mostly in Patagonia, South America, have accumulated 15 (13-18) GtC, with rapid accumulation during the Antarctic Thermal Maximum in the late glacial, and during the mid-Holocene thermal maximum. This is the first comparison of peatland dynamics among these global regions. Our analysis shows that a diversity of drivers at different times have significantly impacted the global C cycle, through the contribution of peatlands to atmospheric CH4 budgets and the history of peatland CO2 exchange with the atmosphere.

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