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Title: Influences and interactions of inundation, peat, and snow on active layer thickness

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL068550· OSTI ID:1260075
 [1];  [1];  [2];  [1];  [1]
  1. Los Alamos National Laboratory, Los Alamos New Mexico USA
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Institute and Environmental Sciences Division

Active layer thickness (ALT), the uppermost layer of soil that thaws on an annual basis, is a direct control on the amount of organic carbon potentially available for decomposition and release to the atmosphere as carbon-rich Arctic permafrost soils thaw in a warming climate. Here, we investigate how key site characteristics affect ALT using an integrated surface/subsurface permafrost thermal hydrology model. ALT is most sensitive to organic layer thickness followed by snow depth but is relatively insensitive to the amount of water on the landscape with other conditions held fixed. Furthermore, the weak ALT sensitivity to subsurface saturation suggests that changes in Arctic landscape hydrology may only have a minor effect on future ALT. But, surface inundation amplifies the sensitivities to the other parameters and under large snowpacks can trigger the formation of near-surface taliks.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725; AC52-06NA25396
OSTI ID:
1260075
Alternate ID(s):
OSTI ID: 1304711
Report Number(s):
LA-UR-15-28074; KP1702010; ERKP757
Journal Information:
Geophysical Research Letters, Vol. 43, Issue 10; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (15)

Hydrometeorological measurements in peatland‐dominated, discontinuous permafrost at Scotty Creek, Northwest Territories, Canada journal June 2019
Controls on permafrost thaw in a coupled groundwater-flow and heat-transport system: Iqaluit Airport, Nunavut, Canada journal December 2016
Coupled cryo-hydrogeological modelling of permafrost dynamics near Umiujaq (Nunavik, Canada) journal February 2020
Soil Physical, Hydraulic, and Thermal Properties in Interior Alaska, USA: Implications for Hydrologic Response to Thawing Permafrost Conditions journal May 2019
Taliks: A Tipping Point in Discontinuous Permafrost Degradation in Peatlands journal November 2019
Feedbacks Between Surface Deformation and Permafrost Degradation in Ice Wedge Polygons, Arctic Coastal Plain, Alaska journal March 2020
Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape journal October 2018
Permafrost thaw induced drying of wetlands at Scotty Creek, NWT, Canada journal October 2018
Effects of bryophyte and lichen cover on permafrost soil temperature at large scale journal January 2016
Semi-automated calibration method for modelling of mountain permafrost evolution in Switzerland journal January 2016
Microtopographic control on the ground thermal regime in ice wedge polygons journal January 2018
New insights into the environmental factors controlling the ground thermal regime across the Northern Hemisphere: a comparison between permafrost and non-permafrost areas journal January 2019
Effects of bryophyte and lichen cover on permafrost soil temperature at large scale posted_content February 2016
Semi-automated calibration method for modelling of mountain permafrost evolution in Switzerland text January 2016
Semi-automated calibration method for modelling of mountain permafrost evolution in Switzerland posted_content September 2015