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Title: Comparison of effects of cold‐region soil/snow processes and the uncertainties from model forcing data on permafrost physical characteristics

Abstract

Here, we used a land surface model to (1) evaluate the influence of recent improvements in modeling cold-region soil/snow physics on near-surface permafrost physical characteristics (within 0–3 m soil column) in the northern high latitudes (NHL) and (2) compare them with uncertainties from climate and land-cover data sets. Specifically, four soil/snow processes are investigated: deep soil energetics, soil organic carbon (SOC) effects on soil properties, wind compaction of snow, and depth hoar formation. In the model, together they increased the contemporary NHL permafrost area by 9.2 × 106 km2 (from 2.9 to 12.3—without and with these processes, respectively) and reduced historical degradation rates. In comparison, permafrost area using different climate data sets (with annual air temperature difference of ~0.5°C) differed by up to 2.3 × 106 km2, with minimal contribution of up to 0.7 × 106 km2 from substantial land-cover differences. Individually, the strongest role in permafrost increase was from deep soil energetics, followed by contributions from SOC and wind compaction, while depth hoar decreased permafrost. The respective contribution on 0–3 m permafrost stability also followed a similar pattern. However, soil temperature and moisture within vegetation root zone (~0–1 m), which strongly influence soil biogeochemistry, were only affected by themore » latter three processes. The ecosystem energy and water fluxes were impacted the least due to these soil/snow processes. While it is evident that simulated permafrost physical characteristics benefit from detailed treatment of cold-region biogeophysical processes, we argue that these should also lead to integrated improvements in modeling of biogeochemistry.« less

Authors:
 [1];  [1]
  1. Department of Atmospheric SciencesUniversity of IllinoisUrbana Illinois USA
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1244565
Alternate Identifier(s):
OSTI ID: 1244566; OSTI ID: 1258600
Grant/Contract Number:  
DOE‐DE‐SC0006706; SC0006706
Resource Type:
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 8 Journal Issue: 1; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Barman, Rahul, and Jain, Atul K. Comparison of effects of cold‐region soil/snow processes and the uncertainties from model forcing data on permafrost physical characteristics. United States: N. p., 2016. Web. doi:10.1002/2015MS000504.
Barman, Rahul, & Jain, Atul K. Comparison of effects of cold‐region soil/snow processes and the uncertainties from model forcing data on permafrost physical characteristics. United States. doi:10.1002/2015MS000504.
Barman, Rahul, and Jain, Atul K. Mon . "Comparison of effects of cold‐region soil/snow processes and the uncertainties from model forcing data on permafrost physical characteristics". United States. doi:10.1002/2015MS000504.
@article{osti_1244565,
title = {Comparison of effects of cold‐region soil/snow processes and the uncertainties from model forcing data on permafrost physical characteristics},
author = {Barman, Rahul and Jain, Atul K.},
abstractNote = {Here, we used a land surface model to (1) evaluate the influence of recent improvements in modeling cold-region soil/snow physics on near-surface permafrost physical characteristics (within 0–3 m soil column) in the northern high latitudes (NHL) and (2) compare them with uncertainties from climate and land-cover data sets. Specifically, four soil/snow processes are investigated: deep soil energetics, soil organic carbon (SOC) effects on soil properties, wind compaction of snow, and depth hoar formation. In the model, together they increased the contemporary NHL permafrost area by 9.2 × 106 km2 (from 2.9 to 12.3—without and with these processes, respectively) and reduced historical degradation rates. In comparison, permafrost area using different climate data sets (with annual air temperature difference of ~0.5°C) differed by up to 2.3 × 106 km2, with minimal contribution of up to 0.7 × 106 km2 from substantial land-cover differences. Individually, the strongest role in permafrost increase was from deep soil energetics, followed by contributions from SOC and wind compaction, while depth hoar decreased permafrost. The respective contribution on 0–3 m permafrost stability also followed a similar pattern. However, soil temperature and moisture within vegetation root zone (~0–1 m), which strongly influence soil biogeochemistry, were only affected by the latter three processes. The ecosystem energy and water fluxes were impacted the least due to these soil/snow processes. While it is evident that simulated permafrost physical characteristics benefit from detailed treatment of cold-region biogeophysical processes, we argue that these should also lead to integrated improvements in modeling of biogeochemistry.},
doi = {10.1002/2015MS000504},
journal = {Journal of Advances in Modeling Earth Systems},
number = 1,
volume = 8,
place = {United States},
year = {2016},
month = {3}
}

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Free Publicly Available Full Text
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DOI: 10.1002/2015MS000504

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