Soil pore network response to freeze-thaw cycles in permafrost aggregates

Rooney, Erin

doi:10.15485/1838886

Title: Soil pore network response to freeze-thaw cycles in permafrost aggregates

Dataset
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Abstract

This dataset contains data used for the paper "Pore network response to freeze-thaw cycles in permafrost aggregates". The Related References field will be updated with a full citation when available.Climate change in Arctic landscapes may increase freeze-thaw frequency within the active layer as well as newly thawed permafrost. A highly disruptive process, freeze-thaw can deform soil pores and alter the architecture of the soil pore network with varied impacts to water transport and retention, redox conditions, and microbial activity. Our objective was to investigate how freeze-thaw cycles impacted the pore network of newly thawed permafrost aggregates to improve understanding of what type of transformations can be expected from warming Arctic landscapes. We measured the impact of freeze-thaw on pore morphology, pore throat diameter distribution, and pore connectivity with X-ray computed tomography (XCT) using six permafrost aggregates with sizes of 2.5 cm3 from a mineral soil horizon (Bw; 28-50 cm depths) in Toolik, Alaska. Freeze-thaw cycles were performed using a laboratory incubation consisting of five freeze-thaw cycles (-10˚C to 20˚C) over five weeks. Our findings indicated decreasing spatial connectivity of the pore network across all aggregates with higher frequencies of singly connected pores following freeze-thaw. Water-filled pores that were connected tomore »« less

Authors:

Oregon State University; Oregon State University

Publication Date:: Sat Jan 01 04:00:00 UTC 2022

Research Org.:: Environmental System Science Data Infrastructure for a Virtual Ecosystem; Soil Carbon Biogeochemistry

Sponsoring Org.:: U.S. DOE > Office of Science > Biological and Environmental Research (BER)

Subject:: 54 ENVIRONMENTAL SCIENCES; AGGREGATES; ARCTIC; FREEZE THAW; MICROSCALE; PERMAFROST THAW; PORE CONNECTIVITY; PORE COORDINATION NUMBER; PORE MORPHOLOGY; PORE THROAT DIAMETER; PORE VOLUMETRIC FRACTION

OSTI Identifier:: 1838886

DOI:: https://doi.org/10.15485/1838886

Citation Formats


                    Rooney, Erin. Soil pore network response to freeze-thaw cycles in permafrost aggregates.  United States: N. p., 2022. 
        Web.  doi:10.15485/1838886.

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                    Rooney, Erin. Soil pore network response to freeze-thaw cycles in permafrost aggregates.  United States.  doi:https://doi.org/10.15485/1838886

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                    Rooney, Erin. 2022.  
"Soil pore network response to freeze-thaw cycles in permafrost aggregates".  United States.  doi:https://doi.org/10.15485/1838886.  https://www.osti.gov/servlets/purl/1838886. Pub date:Sat Jan 01 04:00:00 UTC 2022

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@article{osti_1838886,

  title        = {Soil pore network response to freeze-thaw cycles in permafrost aggregates},

  author       = {Rooney, Erin},

  abstractNote = {This dataset contains data used for the paper "Pore network response to freeze-thaw cycles in permafrost aggregates". The Related References field will be updated with a full citation when available.Climate change in Arctic landscapes may increase freeze-thaw frequency within the active layer as well as newly thawed permafrost. A highly disruptive process, freeze-thaw can deform soil pores and alter the architecture of the soil pore network with varied impacts to water transport and retention, redox conditions, and microbial activity. Our objective was to investigate how freeze-thaw cycles impacted the pore network of newly thawed permafrost aggregates to improve understanding of what type of transformations can be expected from warming Arctic landscapes. We measured the impact of freeze-thaw on pore morphology, pore throat diameter distribution, and pore connectivity with X-ray computed tomography (XCT) using six permafrost aggregates with sizes of 2.5 cm3 from a mineral soil horizon (Bw; 28-50 cm depths) in Toolik, Alaska. Freeze-thaw cycles were performed using a laboratory incubation consisting of five freeze-thaw cycles (-10˚C to 20˚C) over five weeks. Our findings indicated decreasing spatial connectivity of the pore network across all aggregates with higher frequencies of singly connected pores following freeze-thaw. Water-filled pores that were connected to the pore network decreased in volume while the overall connected pore volumetric fraction was not affected. Shifts in the pore throat diameter distribution were mostly observed in pore throats ranges of 100 microns or less with no corresponding changes to the pore shape factor of pore throats. Responses of the pore network to freeze-thaw varied with aggregate, suggesting that initial pore morphology may play a role in driving freeze-thaw response. Our research suggests that freeze-thaw alters the microenvironment of permafrost aggregates during the incipient stage of deformation following permafrost thaw, impacting soil properties and function in Arctic landscapes undergoing transition. This dataset contains a compressed (.zip) archive of the data and R scripts used for this manuscript. The dataset includes files in .csv format, which can be accessed and processed using MS Excel or R. This archive can also be accessed on GitHub at https://github.com/Erin-Rooney/XCT-freezethaw (DOI: 10.5281/zenodo.5816355).},

  doi          = {10.15485/1838886},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sat Jan 01 04:00:00 UTC 2022},

  month        = {Sat Jan 01 04:00:00 UTC 2022}

}

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DOI: https://doi.org/10.15485/1838886

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