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Title: Using field observations to inform thermal hydrology models of permafrost dynamics with ATS (v0.83)

Journal Article · · Geoscientific Model Development (Online)
 [1];  [2];  [1];  [1];  [1];  [3]; ORCiD logo [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Alaska Fairbanks, AK (United States)

Climate change is profoundly transforming the carbon-rich Arctic tundra landscape, potentially moving it from a carbon sink to a carbon source by increasing the thickness of soil that thaws on a seasonal basis. Thus, the modeling capability and precise parameterizations of the physical characteristics needed to estimate projected active layer thickness (ALT) are limited in Earth system models (ESMs). In particular, discrepancies in spatial scale between field measurements and Earth system models challenge validation and parameterization of hydrothermal models. A recently developed surface–subsurface model for permafrost thermal hydrology, the Advanced Terrestrial Simulator (ATS), is used in combination with field measurements to achieve the goals of constructing a process-rich model based on plausible parameters and to identify fine-scale controls of ALT in ice-wedge polygon tundra in Barrow, Alaska. An iterative model refinement procedure that cycles between borehole temperature and snow cover measurements and simulations functions to evaluate and parameterize different model processes necessary to simulate freeze–thaw processes and ALT formation. After model refinement and calibration, reasonable matches between simulated and measured soil temperatures are obtained, with the largest errors occurring during early summer above ice wedges (e.g., troughs). The results suggest that properly constructed and calibrated one-dimensional thermal hydrology models have the potential to provide reasonable representation of the subsurface thermal response and can be used to infer model input parameters and process representations. The models for soil thermal conductivity and snow distribution were found to be the most sensitive process representations. However, information on lateral flow and snowpack evolution might be needed to constrain model representations of surface hydrology and snow depth.

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); USDOE Laboratory Directed Research and Development (LDRD) Program; Next Generation Ecosystem Experiment (NGEE-­Arctic)
Grant/Contract Number:
AC05-00OR22725; AC52-06NA25396
OSTI ID:
1265637
Alternate ID(s):
OSTI ID: 1227900
Report Number(s):
LA-UR-15-20769; EY804910M
Journal Information:
Geoscientific Model Development (Online), Vol. 8, Issue 9; ISSN 1991-9603
Publisher:
Copernicus Publications, EGUCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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Microtopographic control on the ground thermal regime in ice wedge polygons journal January 2018
Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape journal October 2018
Modeling the spatiotemporal variability in subsurface thermal regimes across a low-relief polygonal tundra landscape journal January 2016
Hydrologic Impacts of Thawing Permafrost—A Review journal January 2016
Active layer hydrology in an arctic tundra ecosystem: quantifying water sources and cycling using water stable isotopes: Active Layer Hydrology in the Arctic Coastal Plain journal August 2016
Air warming trends linked to permafrost warming in the sub-Arctic catchment of Tarfala, Sweden journal January 2016
A coupled model for liquid water, water vapor and heat transport of saturated–unsaturated soil in cold regions: model formulation and verification journal April 2016
Impacts of microtopographic snow redistribution and lateral subsurface processes on hydrologic and thermal states in an Arctic polygonal ground ecosystem: a case study using ELM-3D v1.0 journal January 2018
Feedbacks Between Surface Deformation and Permafrost Degradation in Ice Wedge Polygons, Arctic Coastal Plain, Alaska journal March 2020
Mapping Arctic Plant Functional Type Distributions in the Barrow Environmental Observatory Using WorldView-2 and LiDAR Datasets journal September 2016
Groundwater hydrogeochemistry in permafrost regions journal March 2019
Integrated surface/subsurface permafrost thermal hydrology: Model formulation and proof-of-concept simulations: INTEGRATED PERMAFROST THERMAL HYDROLOGY journal August 2016
Taliks: A Tipping Point in Discontinuous Permafrost Degradation in Peatlands journal November 2019
Permafrost Degradation and Subsidence Observations during a Controlled Warming Experiment journal July 2018
Estimation of subsurface porosities and thermal conductivities of polygonal tundra by coupled inversion of electrical resistivity, temperature, and moisture content data journal January 2020