Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost
Soil pore water (SPW) chemistry can vary substantially across multiple scales in Arctic permafrost landscapes. The magnitude of these variations and their relationship to scale are critical considerations for understanding current controls on geochemical cycling and for predicting future changes. Th...
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ftcopernicus:oai:publications.copernicus.org:egusphere102350 2023-10-09T21:48:41+02:00 Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost Conroy, Nathan Alec Heikoop, Jeffrey Lathrop, Emma Musa, Dea Newman, Brent Xu, Chonggang McCaully, Rachael Arendt, Carli Salmon, Verity Breen, Amy Romanovsky, Vladimir Bennett, Katrina Wilson, Cathy Wullschleger, Stan 2023-09-14 application/pdf https://doi.org/10.5194/egusphere-2022-137 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-137/ eng eng doi:10.5194/egusphere-2022-137 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-137/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2022-137 2023-09-18T16:24:17Z Soil pore water (SPW) chemistry can vary substantially across multiple scales in Arctic permafrost landscapes. The magnitude of these variations and their relationship to scale are critical considerations for understanding current controls on geochemical cycling and for predicting future changes. These aspects are especially important for Arctic change modeling where accurate representation of sub-grid variability may be necessary to predict watershed-scale behaviors. Our research goal is to characterize intra- and inter-watershed soil water geochemical variations at two contrasting locations in the Seward Peninsula of Alaska, USA. We then attempt to identify the key factors controlling concentrations of important pore water solutes in these systems. The SPW geochemistry of 18 locations spanning two small Arctic catchments was examined for spatial variability and its dominant environmental controls. The primary environmental controls considered were vegetation, soil moisture and/or redox condition, water–soil interactions and hydrologic transport, and mineral solubility. The sampling locations varied in terms of vegetation type and canopy height, presence or absence of near-surface permafrost, soil moisture, and hillslope position. Vegetation was found to have a significant impact on SPW NO 3 - <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="9pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="5c4cefaf8b78d41c1ce2f2ef151f712f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-17-3987-2023-ie00001.svg" width="9pt" height="16pt" src="tc-17-3987-2023-ie00001.png"/></svg:svg> concentrations, associated with the localized presence of nitrogen-fixing alders and mineralization and nitrification of leaf litter from tall willow shrubs. The elevated NO 3 - <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="9pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="53e1f98be2cdf70dbe180d95894fc6b5"><svg:image ... Text Arctic permafrost Seward Peninsula Alaska Copernicus Publications: E-Journals Arctic |
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Open Polar |
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Copernicus Publications: E-Journals |
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language |
English |
description |
Soil pore water (SPW) chemistry can vary substantially across multiple scales in Arctic permafrost landscapes. The magnitude of these variations and their relationship to scale are critical considerations for understanding current controls on geochemical cycling and for predicting future changes. These aspects are especially important for Arctic change modeling where accurate representation of sub-grid variability may be necessary to predict watershed-scale behaviors. Our research goal is to characterize intra- and inter-watershed soil water geochemical variations at two contrasting locations in the Seward Peninsula of Alaska, USA. We then attempt to identify the key factors controlling concentrations of important pore water solutes in these systems. The SPW geochemistry of 18 locations spanning two small Arctic catchments was examined for spatial variability and its dominant environmental controls. The primary environmental controls considered were vegetation, soil moisture and/or redox condition, water–soil interactions and hydrologic transport, and mineral solubility. The sampling locations varied in terms of vegetation type and canopy height, presence or absence of near-surface permafrost, soil moisture, and hillslope position. Vegetation was found to have a significant impact on SPW NO 3 - <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="9pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="5c4cefaf8b78d41c1ce2f2ef151f712f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-17-3987-2023-ie00001.svg" width="9pt" height="16pt" src="tc-17-3987-2023-ie00001.png"/></svg:svg> concentrations, associated with the localized presence of nitrogen-fixing alders and mineralization and nitrification of leaf litter from tall willow shrubs. The elevated NO 3 - <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="9pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="53e1f98be2cdf70dbe180d95894fc6b5"><svg:image ... |
format |
Text |
author |
Conroy, Nathan Alec Heikoop, Jeffrey Lathrop, Emma Musa, Dea Newman, Brent Xu, Chonggang McCaully, Rachael Arendt, Carli Salmon, Verity Breen, Amy Romanovsky, Vladimir Bennett, Katrina Wilson, Cathy Wullschleger, Stan |
spellingShingle |
Conroy, Nathan Alec Heikoop, Jeffrey Lathrop, Emma Musa, Dea Newman, Brent Xu, Chonggang McCaully, Rachael Arendt, Carli Salmon, Verity Breen, Amy Romanovsky, Vladimir Bennett, Katrina Wilson, Cathy Wullschleger, Stan Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost |
author_facet |
Conroy, Nathan Alec Heikoop, Jeffrey Lathrop, Emma Musa, Dea Newman, Brent Xu, Chonggang McCaully, Rachael Arendt, Carli Salmon, Verity Breen, Amy Romanovsky, Vladimir Bennett, Katrina Wilson, Cathy Wullschleger, Stan |
author_sort |
Conroy, Nathan Alec |
title |
Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost |
title_short |
Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost |
title_full |
Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost |
title_fullStr |
Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost |
title_full_unstemmed |
Environmental Controls on Observed Spatial Variability of Soil Pore Water Geochemistry in Small Headwater Catchments Underlain with Permafrost |
title_sort |
environmental controls on observed spatial variability of soil pore water geochemistry in small headwater catchments underlain with permafrost |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-137 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-137/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Seward Peninsula Alaska |
genre_facet |
Arctic permafrost Seward Peninsula Alaska |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-137 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-137/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-137 |
_version_ |
1779311761208377344 |