Widespread global peatland establishment and persistence over the last 130,000 y

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Treat , C C , Kleinen , T , Broothaerts , N , Dalton , A S , Dommain , R , Douglas , T A , Drexler , J Z , Finkelstein , S A , Grosse , G , Hope , G , Hutchings , J , Jones , M C , Kuhry , P , Lacourse , T , Lahteenoja , O , Loisel , J , Notebaert , B , Payne , R J , Peteet , D M , Sannel , A B K , Stelling , J M , Strauss , J , Swindles , G T , Talbot , J , Tarnocai , C , Verstraeten , G , Williams , C J , Xia , Z , Yu , Z , Väliranta , M , Hattestrand , M , Alexanderson , H & Brovkin , V 2019 , ' Widespread global peatland establishment and persistence over the last 130,000 y ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 116 , no. 11 , pp. 4822-4827 . https://doi.org/10.1073/pnas.1813305116

Title: Widespread global peatland establishment and persistence over the last 130,000 y
Author: Treat, Claire C.; Kleinen, Thomas; Broothaerts, Nils; Dalton, April S.; Dommain, Rene; Douglas, Thomas A.; Drexler, Judith Z.; Finkelstein, Sarah A.; Grosse, Guido; Hope, Geoffrey; Hutchings, Jack; Jones, Miriam C.; Kuhry, Peter; Lacourse, Terri; Lahteenoja, Outi; Loisel, Julie; Notebaert, Bastiaan; Payne, Richard J.; Peteet, Dorothy M.; Sannel, A. Britta K.; Stelling, Jonathan M.; Strauss, Jens; Swindles, Graeme T.; Talbot, Julie; Tarnocai, Charles; Verstraeten, Gert; Williams, Christopher J.; Xia, Zhengyu; Yu, Zicheng; Väliranta, Minna; Hattestrand, Martina; Alexanderson, Helena; Brovkin, Victor
Contributor: University of Helsinki, Ecosystems and Environment Research Programme
Date: 2019-03-12
Language: eng
Number of pages: 6
Belongs to series: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
URI: http://hdl.handle.net/10138/303793
Abstract: Glacial-interglacial variations in CO2 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 degrees 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.
Subject: peatlands
carbon
methane
carbon burial
Quaternary
NORTHERN PEATLANDS
ATMOSPHERIC CH4
GLACIAL CYCLES
SYSTEM MODEL
CARBON-CYCLE
SOIL CARBON
CLIMATE
CO2
DYNAMICS
EXTENT
1172 Environmental sciences
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