Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America
Northern peatlands contain a large terrestrial carbon pool that plays an important role in the Earth's carbon cycle. A considerable fraction of this carbon pool is currently in permafrost and is biogeochemically relatively inert; this will change with increasing soil temperatures as a result of...
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Copernicus Publications
2011-06-01
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Series: | Earth System Dynamics |
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doaj-eefe7e907f9c4f1aac36acd5081729282020-11-24T21:53:24ZengCopernicus PublicationsEarth System Dynamics2190-49792190-49872011-06-012112113810.5194/esd-2-121-2011Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North AmericaD. WisserS. MarchenkoJ. TalbotC. TreatS. FrolkingNorthern peatlands contain a large terrestrial carbon pool that plays an important role in the Earth's carbon cycle. A considerable fraction of this carbon pool is currently in permafrost and is biogeochemically relatively inert; this will change with increasing soil temperatures as a result of climate warming in the 21st century. We use a geospatially explicit representation of peat areas and peat depth from a recently-compiled database and a geothermal model to estimate northern North America soil temperature responses to predicted changes in air temperature. We find that, despite a widespread decline in the areas classified as permafrost, soil temperatures in peatlands respond more slowly to increases in air temperature owing to the insulating properties of peat. We estimate that an additional 670 km<sup>3</sup> of peat soils in North America, containing ~33 Pg C, could be seasonally thawed by the end of the century, representing ~20 % of the total peat volume in Alaska and Canada. Warming conditions result in a lengthening of the soil thaw period by ~40 days, averaged over the model domain. These changes have potentially important implications for the carbon balance of peat soils.http://www.earth-syst-dynam.net/2/121/2011/esd-2-121-2011.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. Wisser S. Marchenko J. Talbot C. Treat S. Frolking |
spellingShingle |
D. Wisser S. Marchenko J. Talbot C. Treat S. Frolking Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America Earth System Dynamics |
author_facet |
D. Wisser S. Marchenko J. Talbot C. Treat S. Frolking |
author_sort |
D. Wisser |
title |
Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America |
title_short |
Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America |
title_full |
Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America |
title_fullStr |
Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America |
title_full_unstemmed |
Soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in North America |
title_sort |
soil temperature response to 21st century global warming: the role of and some implications for peat carbon in thawing permafrost soils in north america |
publisher |
Copernicus Publications |
series |
Earth System Dynamics |
issn |
2190-4979 2190-4987 |
publishDate |
2011-06-01 |
description |
Northern peatlands contain a large terrestrial carbon pool that plays an important role in the Earth's carbon cycle. A considerable fraction of this carbon pool is currently in permafrost and is biogeochemically relatively inert; this will change with increasing soil temperatures as a result of climate warming in the 21st century. We use a geospatially explicit representation of peat areas and peat depth from a recently-compiled database and a geothermal model to estimate northern North America soil temperature responses to predicted changes in air temperature. We find that, despite a widespread decline in the areas classified as permafrost, soil temperatures in peatlands respond more slowly to increases in air temperature owing to the insulating properties of peat. We estimate that an additional 670 km<sup>3</sup> of peat soils in North America, containing ~33 Pg C, could be seasonally thawed by the end of the century, representing ~20 % of the total peat volume in Alaska and Canada. Warming conditions result in a lengthening of the soil thaw period by ~40 days, averaged over the model domain. These changes have potentially important implications for the carbon balance of peat soils. |
url |
http://www.earth-syst-dynam.net/2/121/2011/esd-2-121-2011.pdf |
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