Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling
Modeling and observation of ground temperature dynamics are the main tools for understanding current permafrost thermal regimes and projecting future thaw. Until recently, most studies on permafrost have focused on vertical ground heat fluxes. Groundwater can transport heat in both lateral and verti...
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ftcopenhagenunip:oai:pure.atira.dk:publications/2c9bda6a-e8a4-4150-8611-0154471330a5 2023-05-15T16:37:06+02:00 Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling Sjöberg, Ylva Coon, Ethan K. Sannel, A. Britta Pannetier, Romain Harp, Dylan Frampton, Andrew Painter, Scott L. Lyon, Steve W. 2016 https://curis.ku.dk/portal/da/publications/thermal-effects-of-groundwater-flow-through-subarctic-fens(2c9bda6a-e8a4-4150-8611-0154471330a5).html https://doi.org/10.1002/2015WR017571 eng eng info:eu-repo/semantics/closedAccess Sjöberg , Y , Coon , E , K. Sannel , A B , Pannetier , R , Harp , D , Frampton , A , Painter , S L & Lyon , S W 2016 , ' Thermal effects of groundwater flow through subarctic fens : A case study based on field observations and numerical modeling ' , Water Resources Research , vol. 52 , no. 3 , pp. 1591-1606 . https://doi.org/10.1002/2015WR017571 advective heat transfer groundwater numerical modeling permafrost article 2016 ftcopenhagenunip https://doi.org/10.1002/2015WR017571 2022-02-24T00:33:58Z Modeling and observation of ground temperature dynamics are the main tools for understanding current permafrost thermal regimes and projecting future thaw. Until recently, most studies on permafrost have focused on vertical ground heat fluxes. Groundwater can transport heat in both lateral and vertical directions but its influence on ground temperatures at local scales in permafrost environments is not well understood. In this study we combine field observations from a subarctic fen in the sporadic permafrost zone with numerical simulations of coupled water and thermal fluxes. At the Tavvavuoma study site in northern Sweden, ground temperature profiles and groundwater levels were observed in boreholes. These observations were used to set up one- and two-dimensional simulations down to 2 m depth across a gradient of permafrost conditions within and surrounding the fen. Two-dimensional scenarios representing the fen under various hydraulic gradients were developed to quantify the influence of groundwater flow on ground temperature. Our observations suggest that lateral groundwater flow significantly affects ground temperatures. This is corroborated by modeling results that show seasonal ground ice melts 1 month earlier when a lateral groundwater flux is present. Further, although the thermal regime may be dominated by vertically conducted heat fluxes during most of the year, isolated high groundwater flow rate events such as the spring freshet are potentially important for ground temperatures. As sporadic permafrost environments often contain substantial portions of unfrozen ground with active groundwater flow paths, knowledge of this heat transport mechanism is important for understanding permafrost dynamics in these environments. Article in Journal/Newspaper Ice Northern Sweden permafrost Subarctic University of Copenhagen: Research Tavvavuoma ENVELOPE(20.860,20.860,68.520,68.520) Water Resources Research 52 3 1591 1606 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
advective heat transfer groundwater numerical modeling permafrost |
spellingShingle |
advective heat transfer groundwater numerical modeling permafrost Sjöberg, Ylva Coon, Ethan K. Sannel, A. Britta Pannetier, Romain Harp, Dylan Frampton, Andrew Painter, Scott L. Lyon, Steve W. Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling |
topic_facet |
advective heat transfer groundwater numerical modeling permafrost |
description |
Modeling and observation of ground temperature dynamics are the main tools for understanding current permafrost thermal regimes and projecting future thaw. Until recently, most studies on permafrost have focused on vertical ground heat fluxes. Groundwater can transport heat in both lateral and vertical directions but its influence on ground temperatures at local scales in permafrost environments is not well understood. In this study we combine field observations from a subarctic fen in the sporadic permafrost zone with numerical simulations of coupled water and thermal fluxes. At the Tavvavuoma study site in northern Sweden, ground temperature profiles and groundwater levels were observed in boreholes. These observations were used to set up one- and two-dimensional simulations down to 2 m depth across a gradient of permafrost conditions within and surrounding the fen. Two-dimensional scenarios representing the fen under various hydraulic gradients were developed to quantify the influence of groundwater flow on ground temperature. Our observations suggest that lateral groundwater flow significantly affects ground temperatures. This is corroborated by modeling results that show seasonal ground ice melts 1 month earlier when a lateral groundwater flux is present. Further, although the thermal regime may be dominated by vertically conducted heat fluxes during most of the year, isolated high groundwater flow rate events such as the spring freshet are potentially important for ground temperatures. As sporadic permafrost environments often contain substantial portions of unfrozen ground with active groundwater flow paths, knowledge of this heat transport mechanism is important for understanding permafrost dynamics in these environments. |
format |
Article in Journal/Newspaper |
author |
Sjöberg, Ylva Coon, Ethan K. Sannel, A. Britta Pannetier, Romain Harp, Dylan Frampton, Andrew Painter, Scott L. Lyon, Steve W. |
author_facet |
Sjöberg, Ylva Coon, Ethan K. Sannel, A. Britta Pannetier, Romain Harp, Dylan Frampton, Andrew Painter, Scott L. Lyon, Steve W. |
author_sort |
Sjöberg, Ylva |
title |
Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling |
title_short |
Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling |
title_full |
Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling |
title_fullStr |
Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling |
title_full_unstemmed |
Thermal effects of groundwater flow through subarctic fens:A case study based on field observations and numerical modeling |
title_sort |
thermal effects of groundwater flow through subarctic fens:a case study based on field observations and numerical modeling |
publishDate |
2016 |
url |
https://curis.ku.dk/portal/da/publications/thermal-effects-of-groundwater-flow-through-subarctic-fens(2c9bda6a-e8a4-4150-8611-0154471330a5).html https://doi.org/10.1002/2015WR017571 |
long_lat |
ENVELOPE(20.860,20.860,68.520,68.520) |
geographic |
Tavvavuoma |
geographic_facet |
Tavvavuoma |
genre |
Ice Northern Sweden permafrost Subarctic |
genre_facet |
Ice Northern Sweden permafrost Subarctic |
op_source |
Sjöberg , Y , Coon , E , K. Sannel , A B , Pannetier , R , Harp , D , Frampton , A , Painter , S L & Lyon , S W 2016 , ' Thermal effects of groundwater flow through subarctic fens : A case study based on field observations and numerical modeling ' , Water Resources Research , vol. 52 , no. 3 , pp. 1591-1606 . https://doi.org/10.1002/2015WR017571 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1002/2015WR017571 |
container_title |
Water Resources Research |
container_volume |
52 |
container_issue |
3 |
container_start_page |
1591 |
op_container_end_page |
1606 |
_version_ |
1766027406940831744 |