Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape
Through taliks—thawed zones extending through the entire permafrost layer—represent a critical type of heterogeneity that affects water redistribution and heat transport, especially in sloping landscapes. The formation of through taliks as part of the transition from continuous to discontinuous perm...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/aadd30 |
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| author | Elchin E Jafarov Ethan T Coon Dylan R Harp Cathy J Wilson Scott L Painter Adam L Atchley Vladimir E Romanovsky |
| author_facet | Elchin E Jafarov Ethan T Coon Dylan R Harp Cathy J Wilson Scott L Painter Adam L Atchley Vladimir E Romanovsky |
| author_sort | Elchin E Jafarov |
| collection | DOAJ |
| description | Through taliks—thawed zones extending through the entire permafrost layer—represent a critical type of heterogeneity that affects water redistribution and heat transport, especially in sloping landscapes. The formation of through taliks as part of the transition from continuous to discontinuous permafrost creates new hydrologic pathways connecting the active layer to sub-permafrost regions, with significant hydrological and biogeochemical consequences. At hilly field sites in the southern Seward Peninsula, AK, patches of deep snow in tall shrubs are associated with higher winter ground temperatures and an anomalously deep active layer. To better understand the thermal-hydrologic controls and consequences of through taliks, we used the coupled surface/subsurface permafrost hydrology model ATS (Advanced Terrestrial Simulator) to simulate through taliks associated with preferentially distributing snow. Scenarios were developed based on an intensively studied hillslope transect on the southern Seward Peninsula, which predominately has taller shrubs midslope and tundra in upslope and downslope areas. The model was forced with detrended meteorological data with snow preferentially distributed at the midslope of the domain to investigate the potential role of vegetation-induced snow trapping in controlling through talik development under conditions typical of the current-day Seward Peninsula. We simulated thermal hydrology and talik development for five permafrost conditions ranging in thickness from 17–45 m. For the three thinnest permafrost configurations, a through talik developed, which allowed water from the seasonally thawed layer into sub-permafrost waters, increasing sub-permafrost groundwater flow. These numerical experiments suggest that in the transition from continuous to discontinuous permafrost, through taliks may appear at locations that preferential trap snow and that the appearance of those through taliks may drive significant changes in permafrost hydrology. |
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| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T16:01:23Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
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| series | Environmental Research Letters |
| spelling | doaj.art-2e39e0fe9e8b468cb83d3ca4339fb2852023-08-09T14:35:25ZengIOP PublishingEnvironmental Research Letters1748-93262018-01-01131010500610.1088/1748-9326/aadd30Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscapeElchin E Jafarov0https://orcid.org/0000-0002-8310-3261Ethan T Coon1Dylan R Harp2Cathy J Wilson3Scott L Painter4Adam L Atchley5Vladimir E Romanovsky6Los Alamos National Laboratory, Los Alamos, New Mexico, United States of AmericaClimate Change Science Institute and Environmental Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of AmericaLos Alamos National Laboratory, Los Alamos, New Mexico, United States of AmericaLos Alamos National Laboratory, Los Alamos, New Mexico, United States of AmericaClimate Change Science Institute and Environmental Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of AmericaLos Alamos National Laboratory, Los Alamos, New Mexico, United States of AmericaGeophysical Institute, University of Alaska Fairbanks , Fairbanks, Alaska, United States of AmericaThrough taliks—thawed zones extending through the entire permafrost layer—represent a critical type of heterogeneity that affects water redistribution and heat transport, especially in sloping landscapes. The formation of through taliks as part of the transition from continuous to discontinuous permafrost creates new hydrologic pathways connecting the active layer to sub-permafrost regions, with significant hydrological and biogeochemical consequences. At hilly field sites in the southern Seward Peninsula, AK, patches of deep snow in tall shrubs are associated with higher winter ground temperatures and an anomalously deep active layer. To better understand the thermal-hydrologic controls and consequences of through taliks, we used the coupled surface/subsurface permafrost hydrology model ATS (Advanced Terrestrial Simulator) to simulate through taliks associated with preferentially distributing snow. Scenarios were developed based on an intensively studied hillslope transect on the southern Seward Peninsula, which predominately has taller shrubs midslope and tundra in upslope and downslope areas. The model was forced with detrended meteorological data with snow preferentially distributed at the midslope of the domain to investigate the potential role of vegetation-induced snow trapping in controlling through talik development under conditions typical of the current-day Seward Peninsula. We simulated thermal hydrology and talik development for five permafrost conditions ranging in thickness from 17–45 m. For the three thinnest permafrost configurations, a through talik developed, which allowed water from the seasonally thawed layer into sub-permafrost waters, increasing sub-permafrost groundwater flow. These numerical experiments suggest that in the transition from continuous to discontinuous permafrost, through taliks may appear at locations that preferential trap snow and that the appearance of those through taliks may drive significant changes in permafrost hydrology.https://doi.org/10.1088/1748-9326/aadd30permafrosthydrologymodelingATStalik |
| spellingShingle | Elchin E Jafarov Ethan T Coon Dylan R Harp Cathy J Wilson Scott L Painter Adam L Atchley Vladimir E Romanovsky Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape Environmental Research Letters permafrost hydrology modeling ATS talik |
| title | Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape |
| title_full | Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape |
| title_fullStr | Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape |
| title_full_unstemmed | Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape |
| title_short | Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape |
| title_sort | modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape |
| topic | permafrost hydrology modeling ATS talik |
| url | https://doi.org/10.1088/1748-9326/aadd30 |
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