Active layer thickness as a function of soil water content

Active layer thickness (ALT) is a critical metric for monitoring permafrost. How soil moisture influences ALT depends on two competing hypotheses: (a) increased soil moisture increases the latent heat of fusion for thaw, resulting in shallower active layers, and (b) increased soil moisture increases...

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Veröffentlicht in:Environmental research letters Jg. 16; H. 5; S. 55028 - 55036
Hauptverfasser: Clayton, Leah K, Schaefer, Kevin, Battaglia, Michael J, Bourgeau-Chavez, Laura, Chen, Jingyi, Chen, Richard H, Chen, Albert, Bakian-Dogaheh, Kazem, Grelik, Sarah, Jafarov, Elchin, Liu, Lin, Michaelides, Roger John, Moghaddam, Mahta, Parsekian, Andrew D, Rocha, Adrian V, Schaefer, Sean R, Sullivan, Taylor, Tabatabaeenejad, Alireza, Wang, Kang, Wilson, Cathy J, Zebker, Howard A, Zhang, Tingjun, Zhao, Yuhuan
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Bristol IOP Publishing 01.05.2021
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ISSN:1748-9326, 1748-9326
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Abstract Active layer thickness (ALT) is a critical metric for monitoring permafrost. How soil moisture influences ALT depends on two competing hypotheses: (a) increased soil moisture increases the latent heat of fusion for thaw, resulting in shallower active layers, and (b) increased soil moisture increases soil thermal conductivity, resulting in deeper active layers. To investigate their relative influence on thaw depth, we analyzed the Field Measurements of Soil Moisture and Active Layer Thickness (SMALT) in Alaska and Canada dataset, consisting of thousands of measurements of thaw depth and soil moisture collected at dozens of sites across Alaska and Canada as part of NASA’s Arctic Boreal Vulnerability Experiment (ABoVE). As bulk volumetric water content (VWC) integrated over the entire active layer increases, ALT decreases, supporting the latent heat hypothesis. However, as VWC in the top 12 cm of soil increases, ALT increases, supporting the thermal conductivity hypothesis. Regional temperature variations determine the baseline thaw depth while precipitation may influence the sensitivity of ALT to changes in VWC. Soil latent heat dominates over thermal conductivity in determining ALT, and the effect of bulk VWC on ALT appears consistent across sites.
AbstractList Active layer thickness (ALT) is a critical metric for monitoring permafrost. How soil moisture influences ALT depends on two competing hypotheses: (a) increased soil moisture increases the latent heat of fusion for thaw, resulting in shallower active layers, and (b) increased soil moisture increases soil thermal conductivity, resulting in deeper active layers. To investigate their relative influence on thaw depth, we analyzed the Field Measurements of Soil Moisture and Active Layer Thickness (SMALT) in Alaska and Canada dataset, consisting of thousands of measurements of thaw depth and soil moisture collected at dozens of sites across Alaska and Canada as part of NASA’s Arctic Boreal Vulnerability Experiment (ABoVE). As bulk volumetric water content (VWC) integrated over the entire active layer increases, ALT decreases, supporting the latent heat hypothesis. However, as VWC in the top 12 cm of soil increases, ALT increases, supporting the thermal conductivity hypothesis. Regional temperature variations determine the baseline thaw depth while precipitation may influence the sensitivity of ALT to changes in VWC. Soil latent heat dominates over thermal conductivity in determining ALT, and the effect of bulk VWC on ALT appears consistent across sites.
Author Zhang, Tingjun
Chen, Richard H
Jafarov, Elchin
Wang, Kang
Schaefer, Kevin
Battaglia, Michael J
Bakian-Dogaheh, Kazem
Grelik, Sarah
Rocha, Adrian V
Bourgeau-Chavez, Laura
Parsekian, Andrew D
Chen, Jingyi
Liu, Lin
Tabatabaeenejad, Alireza
Clayton, Leah K
Moghaddam, Mahta
Schaefer, Sean R
Chen, Albert
Michaelides, Roger John
Sullivan, Taylor
Wilson, Cathy J
Zebker, Howard A
Zhao, Yuhuan
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  organization: Yale University Department of Earth and Planetary Sciences, New Haven, CT, United States of America
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  organization: National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder , Boulder, CO, United States of America
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  surname: Battaglia
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  organization: Michigan Tech Research Institute, Michigan Technological University , Ann Arbor, MI 48105, United States of America
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  organization: Los Alamos National Laboratory Earth and Environmental Science Division, Los Alamos, NM, United States of America
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  surname: Liu
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  organization: The Chinese University of Hong Kong Earth System Science Programme, Faculty of Science, Hong Kong, Hong Kong
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  givenname: Roger John
  orcidid: 0000-0002-7577-6829
  surname: Michaelides
  fullname: Michaelides, Roger John
  organization: Colorado School of Mines Department of Geophysics, Golden, CO, United States of America
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  organization: University of Southern California Department of Electrical and Computer Engineering, Los Angeles, CA, United States of America
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  givenname: Andrew D
  orcidid: 0000-0001-5072-9818
  surname: Parsekian
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  organization: University of Wyoming Department of Civil and Architectural Engineering, 1000 E University Ave., Laramie, WY, United States of America
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  orcidid: 0000-0002-4618-2407
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  organization: University of Notre Dame Department of Biological Sciences and the Environmental Change Initiative, Notre Dame, IN 46556, United States of America
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  organization: University of Wyoming Department of Geology and Geophysics, 1000 E University Ave., Laramie, WY, United States of America
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  fullname: Tabatabaeenejad, Alireza
  organization: University of Southern California Department of Electrical and Computer Engineering, Los Angeles, CA, United States of America
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  givenname: Kang
  orcidid: 0000-0003-3416-572X
  surname: Wang
  fullname: Wang, Kang
  organization: East China Normal University , Shanghai 200241, People’s Republic of China
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  surname: Wilson
  fullname: Wilson, Cathy J
  organization: Los Alamos National Laboratory Earth and Environmental Science Division, Los Alamos, NM, United States of America
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  surname: Zebker
  fullname: Zebker, Howard A
  organization: Stanford University Department of Geophysics, Stanford, CA, United States of America
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  givenname: Tingjun
  orcidid: 0000-0002-1325-2341
  surname: Zhang
  fullname: Zhang, Tingjun
  organization: Key Laboratory of West China’s Environments (DOE), College of Earth and Environmental Sciences, Lanzhou University , Lanzhou 730000, People’s Republic of China
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  givenname: Yuhuan
  surname: Zhao
  fullname: Zhao, Yuhuan
  organization: University of Southern California Department of Electrical and Computer Engineering, Los Angeles, CA, United States of America
BackLink https://www.osti.gov/servlets/purl/1835793$$D View this record in Osti.gov
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  text: 2021-05-01
  day: 01
PublicationDecade 2020
PublicationPlace Bristol
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PublicationTitle Environmental research letters
PublicationTitleAbbrev ERL
PublicationTitleAlternate Environ. Res. Lett
PublicationYear 2021
Publisher IOP Publishing
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Snippet Active layer thickness (ALT) is a critical metric for monitoring permafrost. How soil moisture influences ALT depends on two competing hypotheses: (a)...
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SubjectTerms active layer thickness
Alaska
Environmental monitoring
ENVIRONMENTAL SCIENCES
Heat
Heat conductivity
Heat of fusion
Heat transfer
Hypotheses
Latent heat
Moisture content
Permafrost
Soil conductivity
Soil investigations
Soil layers
Soil moisture
Soil temperature
Soil water
thaw depth
Thermal conductivity
Thickness
Water content
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Title Active layer thickness as a function of soil water content
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Volume 16
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