Modeling the role of lateral surface flow in low‐relief polygonal tundra
Abstract Ice‐wedge polygon troughs play an important role in controlling the hydrology of low‐relief polygonal tundra regions. Lateral surface flow is confined to troughs only, but it is often neglected in model projections of permafrost thermal hydrology. Recent field and modeling studies have show...
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crwiley:10.1002/ppp.2145 2024-09-15T17:34:55+00:00 Modeling the role of lateral surface flow in low‐relief polygonal tundra Jan, Ahmad U.S. Department of Energy Office of Science Oak Ridge National Laboratory U.S. Department of Energy 2022 http://dx.doi.org/10.1002/ppp.2145 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2145 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2145 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/ppp.2145 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 33, issue 3, page 214-225 ISSN 1045-6740 1099-1530 journal-article 2022 crwiley https://doi.org/10.1002/ppp.2145 2024-08-20T04:13:52Z Abstract Ice‐wedge polygon troughs play an important role in controlling the hydrology of low‐relief polygonal tundra regions. Lateral surface flow is confined to troughs only, but it is often neglected in model projections of permafrost thermal hydrology. Recent field and modeling studies have shown that, after rain events, increases in trough water levels are significantly more than the observed precipitation, highlighting the role of lateral surface flow in the polygonal tundra. Therefore, understanding how trough lateral surface flow can influence polygonal tundra thermal hydrology is important, especially under projected changes in temperatures and rainfall in the Arctic regions. Using an integrated cryohydrology model, this study presents plot‐scale end‐of‐century projections of ice‐wedge polygon water budget components and active layer thickness with and without trough lateral surface flow under the Representative Concentration Pathway 8.5 scenario. Trough lateral surface flow is incorporated through a newly developed empirical model, evaluated against field measurements. The numerical scenario that includes trough lateral surface flow simulates discharge (outflow from a polygon) and recharge (rain‐induced inflow to a polygon trough from upslope areas), while the scenario that does not include trough lateral surface flow ignores recharge. The results show considerable reduction (about 100–150%) in evapotranspiration and discharge in rainy years in the scenarios ignoring trough lateral surface flow, but less effect on soil water storage, in comparison with the scenario with trough lateral surface flow. In addition, the results demonstrate long‐term changes (~10–15 cm increase) in active layer thickness when trough lateral surface flow is modeled. This study highlights the importance of including lateral surface flow processes to better understand the long‐term thermal and hydrological changes in low‐relief polygonal tundra regions under a changing climate. Article in Journal/Newspaper Active layer thickness Ice permafrost Permafrost and Periglacial Processes Tundra wedge* Wiley Online Library Permafrost and Periglacial Processes 33 3 214 225 |
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Open Polar |
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Wiley Online Library |
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English |
description |
Abstract Ice‐wedge polygon troughs play an important role in controlling the hydrology of low‐relief polygonal tundra regions. Lateral surface flow is confined to troughs only, but it is often neglected in model projections of permafrost thermal hydrology. Recent field and modeling studies have shown that, after rain events, increases in trough water levels are significantly more than the observed precipitation, highlighting the role of lateral surface flow in the polygonal tundra. Therefore, understanding how trough lateral surface flow can influence polygonal tundra thermal hydrology is important, especially under projected changes in temperatures and rainfall in the Arctic regions. Using an integrated cryohydrology model, this study presents plot‐scale end‐of‐century projections of ice‐wedge polygon water budget components and active layer thickness with and without trough lateral surface flow under the Representative Concentration Pathway 8.5 scenario. Trough lateral surface flow is incorporated through a newly developed empirical model, evaluated against field measurements. The numerical scenario that includes trough lateral surface flow simulates discharge (outflow from a polygon) and recharge (rain‐induced inflow to a polygon trough from upslope areas), while the scenario that does not include trough lateral surface flow ignores recharge. The results show considerable reduction (about 100–150%) in evapotranspiration and discharge in rainy years in the scenarios ignoring trough lateral surface flow, but less effect on soil water storage, in comparison with the scenario with trough lateral surface flow. In addition, the results demonstrate long‐term changes (~10–15 cm increase) in active layer thickness when trough lateral surface flow is modeled. This study highlights the importance of including lateral surface flow processes to better understand the long‐term thermal and hydrological changes in low‐relief polygonal tundra regions under a changing climate. |
author2 |
U.S. Department of Energy Office of Science Oak Ridge National Laboratory U.S. Department of Energy |
format |
Article in Journal/Newspaper |
author |
Jan, Ahmad |
spellingShingle |
Jan, Ahmad Modeling the role of lateral surface flow in low‐relief polygonal tundra |
author_facet |
Jan, Ahmad |
author_sort |
Jan, Ahmad |
title |
Modeling the role of lateral surface flow in low‐relief polygonal tundra |
title_short |
Modeling the role of lateral surface flow in low‐relief polygonal tundra |
title_full |
Modeling the role of lateral surface flow in low‐relief polygonal tundra |
title_fullStr |
Modeling the role of lateral surface flow in low‐relief polygonal tundra |
title_full_unstemmed |
Modeling the role of lateral surface flow in low‐relief polygonal tundra |
title_sort |
modeling the role of lateral surface flow in low‐relief polygonal tundra |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/ppp.2145 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2145 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2145 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/ppp.2145 |
genre |
Active layer thickness Ice permafrost Permafrost and Periglacial Processes Tundra wedge* |
genre_facet |
Active layer thickness Ice permafrost Permafrost and Periglacial Processes Tundra wedge* |
op_source |
Permafrost and Periglacial Processes volume 33, issue 3, page 214-225 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.2145 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
33 |
container_issue |
3 |
container_start_page |
214 |
op_container_end_page |
225 |
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1810433367373512704 |