Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution
With permafrost thawing and changes in active layer dynamics induced by climate change, interactions between biogeochemical and thermal processes in the ground are of great importance. Here, active layer dynamics have been monitored using direct current (DC) resistivity and induced polarization (IP)...
Published in: | Cold Regions Science and Technology |
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Language: | English |
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2015
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Online Access: | https://orbit.dtu.dk/en/publications/8541e360-1a88-485c-81ef-72f4a2b26254 https://doi.org/10.1016/j.coldregions.2015.07.002 |
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ftdtupubl:oai:pure.atira.dk:publications/8541e360-1a88-485c-81ef-72f4a2b26254 2024-06-23T07:53:20+00:00 Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution Doetsch, Joseph Ingeman-Nielsen, Thomas Christiansen, Anders V. Fiandaca, Gianluca Auken, Esben Elberling, Bo 2015 https://orbit.dtu.dk/en/publications/8541e360-1a88-485c-81ef-72f4a2b26254 https://doi.org/10.1016/j.coldregions.2015.07.002 eng eng https://orbit.dtu.dk/en/publications/8541e360-1a88-485c-81ef-72f4a2b26254 info:eu-repo/semantics/closedAccess Doetsch , J , Ingeman-Nielsen , T , Christiansen , A V , Fiandaca , G , Auken , E & Elberling , B 2015 , ' Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution ' , Cold Regions Science and Technology , vol. 119 , pp. 16-28 . https://doi.org/10.1016/j.coldregions.2015.07.002 Active layer Electrical resistivity Greenland Induced polarization Monitoring Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action article 2015 ftdtupubl https://doi.org/10.1016/j.coldregions.2015.07.002 2024-06-04T15:10:52Z With permafrost thawing and changes in active layer dynamics induced by climate change, interactions between biogeochemical and thermal processes in the ground are of great importance. Here, active layer dynamics have been monitored using direct current (DC) resistivity and induced polarization (IP) measurements at high temporal resolution and at a relatively large scale at a heath tundra site on Disko Island on the west coast of Greenland (69°N). At the field site, the active layer is disconnected from the deeper permafrost, due to isothermal springs in the region. Borehole sediment characteristics and subsurface temperatures supplemented the DC-IP measurements. A time-lapse DC-IP monitoring system has been acquiring at least six datasets per day on a 42-electrode profile with 0.5. m electrode spacing since July 2013. Remote control of the data acquisition system enables interactive adaptation of the measurement schedule, which is critically important to acquire data in the winter months, where extremely high contact resistances increase the demands on the resistivity meter. Data acquired during the freezing period of October 2013 to February 2014 clearly image the soil freezing as a strong increase in resistivity. While the freezing horizon generally moves deeper with time, some variations in the freezing depth are observed along the profile. Comparison with depth-specific soil temperature indicates an exponential relationship between resistivity and below-freezing temperature. Time-lapse inversions of the full-decay IP data indicate a decrease of normalized chargeability with freezing of the ground, which is the result of a decrease in the total unfrozen water and of the higher ion concentration in the pore-water. We conclude that DC-IP time-lapse measurements can non-intrusively and reliably image freezing patterns and their lateral variation on a 10-100. m scale that is difficult to sample by point measurements. In combination with laboratory experiments, the different patterns in resistivity and ... Article in Journal/Newspaper Greenland permafrost Tundra Technical University of Denmark: DTU Orbit Greenland Cold Regions Science and Technology 119 16 28 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Active layer Electrical resistivity Greenland Induced polarization Monitoring Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
spellingShingle |
Active layer Electrical resistivity Greenland Induced polarization Monitoring Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action Doetsch, Joseph Ingeman-Nielsen, Thomas Christiansen, Anders V. Fiandaca, Gianluca Auken, Esben Elberling, Bo Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution |
topic_facet |
Active layer Electrical resistivity Greenland Induced polarization Monitoring Permafrost /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
description |
With permafrost thawing and changes in active layer dynamics induced by climate change, interactions between biogeochemical and thermal processes in the ground are of great importance. Here, active layer dynamics have been monitored using direct current (DC) resistivity and induced polarization (IP) measurements at high temporal resolution and at a relatively large scale at a heath tundra site on Disko Island on the west coast of Greenland (69°N). At the field site, the active layer is disconnected from the deeper permafrost, due to isothermal springs in the region. Borehole sediment characteristics and subsurface temperatures supplemented the DC-IP measurements. A time-lapse DC-IP monitoring system has been acquiring at least six datasets per day on a 42-electrode profile with 0.5. m electrode spacing since July 2013. Remote control of the data acquisition system enables interactive adaptation of the measurement schedule, which is critically important to acquire data in the winter months, where extremely high contact resistances increase the demands on the resistivity meter. Data acquired during the freezing period of October 2013 to February 2014 clearly image the soil freezing as a strong increase in resistivity. While the freezing horizon generally moves deeper with time, some variations in the freezing depth are observed along the profile. Comparison with depth-specific soil temperature indicates an exponential relationship between resistivity and below-freezing temperature. Time-lapse inversions of the full-decay IP data indicate a decrease of normalized chargeability with freezing of the ground, which is the result of a decrease in the total unfrozen water and of the higher ion concentration in the pore-water. We conclude that DC-IP time-lapse measurements can non-intrusively and reliably image freezing patterns and their lateral variation on a 10-100. m scale that is difficult to sample by point measurements. In combination with laboratory experiments, the different patterns in resistivity and ... |
format |
Article in Journal/Newspaper |
author |
Doetsch, Joseph Ingeman-Nielsen, Thomas Christiansen, Anders V. Fiandaca, Gianluca Auken, Esben Elberling, Bo |
author_facet |
Doetsch, Joseph Ingeman-Nielsen, Thomas Christiansen, Anders V. Fiandaca, Gianluca Auken, Esben Elberling, Bo |
author_sort |
Doetsch, Joseph |
title |
Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution |
title_short |
Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution |
title_full |
Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution |
title_fullStr |
Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution |
title_full_unstemmed |
Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution |
title_sort |
direct current (dc) resistivity and induced polarization (ip) monitoring of active layer dynamics at high temporal resolution |
publishDate |
2015 |
url |
https://orbit.dtu.dk/en/publications/8541e360-1a88-485c-81ef-72f4a2b26254 https://doi.org/10.1016/j.coldregions.2015.07.002 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland permafrost Tundra |
genre_facet |
Greenland permafrost Tundra |
op_source |
Doetsch , J , Ingeman-Nielsen , T , Christiansen , A V , Fiandaca , G , Auken , E & Elberling , B 2015 , ' Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution ' , Cold Regions Science and Technology , vol. 119 , pp. 16-28 . https://doi.org/10.1016/j.coldregions.2015.07.002 |
op_relation |
https://orbit.dtu.dk/en/publications/8541e360-1a88-485c-81ef-72f4a2b26254 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.coldregions.2015.07.002 |
container_title |
Cold Regions Science and Technology |
container_volume |
119 |
container_start_page |
16 |
op_container_end_page |
28 |
_version_ |
1802644933185634304 |