Document


Title

Modelling the effects of climate change and disturbance on permafrost stability in northern organic soils
Document Type: Journal Article
Author(s): C. C. Treat; D. Wisser; S. Marchenko; S. Frolking
Publication Year: 2013

Cataloging Information

Keyword(s):
  • arctic fen
  • black spruce
  • black spruce forest
  • boreal forests
  • carbon
  • climate change
  • Daring Lake
  • disturbance
  • fire management
  • forest management
  • global warming
  • global warming
  • organic soils
  • peatlands
  • peatlands
  • Picea mariana
  • soil management
  • soil temperature
  • tundra
  • wildfires
Region(s):
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 53394
Tall Timbers Record Number: 30775
TTRS Location Status: Not in file
TTRS Call Number: Available
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

Boreal and arctic regions are predicted to warm faster and more strongly than temperate latitudes. Peatlands in these regions contain large stocks of soil carbon in frozen soil and these may effect a strong positive feedback on climate change. We modelled the predicted effects of climate change and wildfire on permafrost in organic soils using a peatland-specific soil thermal model to simulate soil temperatures. We evaluated the model at a lowland black spruce site in Alaska and a sedge-dominated Canadian arctic fen. We estimated the response of soil temperatures and the active layer thickness (AcLTh) under several climate change scenarios. With surface soil temperatures increased by 4.4 °C-5.4 °C, soil temperatures at 100 cm depth increased by 3.6 °C-4.3 °C, the AcLTh increased by 12-30 cm, the zone of partially thawed soil increased, and the number of thaw days increased by 17-26 %. Wildfire caused AcLTh to increase by 26-48 % in the year following fire; AcLTh differences in 2091-2100 were significant (8 cm) at one site. By 2100, climate change effects on AcLTh were larger than wildfire effects suggesting that persistent temperature increases will have a more substantial effect on permafrost than the transient effects of disturbance. © 2013 International Mire Conservation Group and International Peat Society.

Citation:
Treat, C. C., D. Wisser, S. Marchenko, and S. Frolking. 2013. Modelling the effects of climate change and disturbance on permafrost stability in northern organic soils. Mires and Peat, v. 12, p. 02 [article no.].