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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Bibliographic Details
Published in:Environmental Research Letters
Main Authors: Leah K Clayton, Kevin Schaefer, Michael J Battaglia, Laura Bourgeau-Chavez, Jingyi Chen, Richard H Chen, Albert Chen, Kazem Bakian-Dogaheh, Sarah Grelik, Elchin Jafarov, Lin Liu, Roger John Michaelides, Mahta Moghaddam, Andrew D Parsekian, Adrian V Rocha, Sean R Schaefer, Taylor Sullivan, Alireza Tabatabaeenejad, Kang Wang, Cathy J Wilson, Howard A Zebker, Tingjun Zhang, Yuhuan Zhao
Format: Article in Journal/Newspaper
Language:English
Published: IOP Publishing 2021
Subjects:
permafrost
soil moisture
active layer thickness
thaw depth
Alaska
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Science
Q
Physics
QC1-999
Arctic
Canada
Active layer thickness
Online Access:https://doi.org/10.1088/1748-9326/abfa4c
https://doaj.org/article/023a88a76dbf4b60aa4f92449a5739d9
Description
Summary: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.

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