Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem
Microtopographic features, such as polygonal ground, are characteristic sources of landscape heterogeneity in the Alaskan Arctic coastal plain. Here, we analyze the effects of snow redistribution (SR) and lateral subsurface processes on hydrologic and thermal states at a polygonal tundra site near B...
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ftosti:oai:osti.gov:1376603 2023-07-30T04:01:41+02:00 Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem Bisht, Gautam Riley, William J. Wainwright, Haruko M. Dafflon, Baptiste Fengming, Yuan Romanovsky, Vladimir E. 2019-09-13 application/pdf http://www.osti.gov/servlets/purl/1376603 https://www.osti.gov/biblio/1376603 https://doi.org/10.5194/gmd-2017-71 unknown http://www.osti.gov/servlets/purl/1376603 https://www.osti.gov/biblio/1376603 https://doi.org/10.5194/gmd-2017-71 doi:10.5194/gmd-2017-71 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES 2019 ftosti https://doi.org/10.5194/gmd-2017-71 2023-07-11T09:20:26Z Microtopographic features, such as polygonal ground, are characteristic sources of landscape heterogeneity in the Alaskan Arctic coastal plain. Here, we analyze the effects of snow redistribution (SR) and lateral subsurface processes on hydrologic and thermal states at a polygonal tundra site near Barrow, Alaska. We extended the land model integrated in the ACME Earth System Model (ESM) to redistribute incoming snow by accounting for microtopography and incorporated subsurface lateral transport of water and energy (ALMv0-3D). Three 10-years long simulations were performed for a transect across polygonal tundra landscape at the Barrow Environmental Observatory in Alaska to isolate the impact of SR and subsurface process representation. When SR was included, model results show a better agreement (higher R 2 with lower bias and RMSE) for the observed differences in snow depth between polygonal rims and centers. The model was also able to accurately reproduce observed soil temperature vertical profiles in the polygon rims and centers (overall bias, RMSE, and R 2 of 0.59 °C, 1.82 °C, and 0.99, respectively). The spatial heterogeneity of snow depth during the winter due to SR generated surface soil temperature heterogeneity that propagated in depth and time and led to ~10 cm shallower and ~5 cm deeper maximum annual thaw depths under the polygon rims and centers, respectively. Additionally, SR led to spatial heterogeneity in surface energy fluxes and soil moisture during the summer. Excluding lateral subsurface hydrologic and thermal processes led to small effects on mean states but an overestimation of spatial variability in soil moisture and soil temperature as subsurface liquid pressure and thermal gradients were artificially prevented from spatially dissipating over time. The effect of lateral subsurface processes on active layer depths was modest with mean absolute difference of ~3 cm. Our integration of three-dimensional subsurface hydrologic and thermal subsurface dynamics in the ACME land model will facilitate ... Other/Unknown Material Arctic Barrow Tundra Alaska SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES |
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54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES Bisht, Gautam Riley, William J. Wainwright, Haruko M. Dafflon, Baptiste Fengming, Yuan Romanovsky, Vladimir E. Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem |
topic_facet |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES |
description |
Microtopographic features, such as polygonal ground, are characteristic sources of landscape heterogeneity in the Alaskan Arctic coastal plain. Here, we analyze the effects of snow redistribution (SR) and lateral subsurface processes on hydrologic and thermal states at a polygonal tundra site near Barrow, Alaska. We extended the land model integrated in the ACME Earth System Model (ESM) to redistribute incoming snow by accounting for microtopography and incorporated subsurface lateral transport of water and energy (ALMv0-3D). Three 10-years long simulations were performed for a transect across polygonal tundra landscape at the Barrow Environmental Observatory in Alaska to isolate the impact of SR and subsurface process representation. When SR was included, model results show a better agreement (higher R 2 with lower bias and RMSE) for the observed differences in snow depth between polygonal rims and centers. The model was also able to accurately reproduce observed soil temperature vertical profiles in the polygon rims and centers (overall bias, RMSE, and R 2 of 0.59 °C, 1.82 °C, and 0.99, respectively). The spatial heterogeneity of snow depth during the winter due to SR generated surface soil temperature heterogeneity that propagated in depth and time and led to ~10 cm shallower and ~5 cm deeper maximum annual thaw depths under the polygon rims and centers, respectively. Additionally, SR led to spatial heterogeneity in surface energy fluxes and soil moisture during the summer. Excluding lateral subsurface hydrologic and thermal processes led to small effects on mean states but an overestimation of spatial variability in soil moisture and soil temperature as subsurface liquid pressure and thermal gradients were artificially prevented from spatially dissipating over time. The effect of lateral subsurface processes on active layer depths was modest with mean absolute difference of ~3 cm. Our integration of three-dimensional subsurface hydrologic and thermal subsurface dynamics in the ACME land model will facilitate ... |
author |
Bisht, Gautam Riley, William J. Wainwright, Haruko M. Dafflon, Baptiste Fengming, Yuan Romanovsky, Vladimir E. |
author_facet |
Bisht, Gautam Riley, William J. Wainwright, Haruko M. Dafflon, Baptiste Fengming, Yuan Romanovsky, Vladimir E. |
author_sort |
Bisht, Gautam |
title |
Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem |
title_short |
Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem |
title_full |
Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem |
title_fullStr |
Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem |
title_full_unstemmed |
Impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an Arctic polygonal ground ecosystem |
title_sort |
impacts of microtopographic snow-redistribution and lateral subsurface processeson hydrologic and thermal states in an arctic polygonal ground ecosystem |
publishDate |
2019 |
url |
http://www.osti.gov/servlets/purl/1376603 https://www.osti.gov/biblio/1376603 https://doi.org/10.5194/gmd-2017-71 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Tundra Alaska |
genre_facet |
Arctic Barrow Tundra Alaska |
op_relation |
http://www.osti.gov/servlets/purl/1376603 https://www.osti.gov/biblio/1376603 https://doi.org/10.5194/gmd-2017-71 doi:10.5194/gmd-2017-71 |
op_doi |
https://doi.org/10.5194/gmd-2017-71 |
_version_ |
1772812444481093632 |