Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate
In continuous permafrost lowlands, thawing of ice-rich deposits and melting of massive ground ice lead to abrupt landscape changes called thermokarst, which have widespread consequences on the thermal, hydrological, and biogeochemical state of the subsurface. However, macro-scale land surface models...
Published in: | The Cryosphere |
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Copernicus GmbH
2021
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Online Access: | https://epic.awi.de/id/eprint/53879/ https://epic.awi.de/id/eprint/53879/1/Nitzbon-et-al_2021_Effects-of-multi-scale-heterogeneity.pdf https://doi.org/10.5194/tc-15-1399-2021 https://hdl.handle.net/10013/epic.b24242c3-0e59-43cf-981c-450b169ae50d |
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ftawi:oai:epic.awi.de:53879 2024-05-19T07:36:50+00:00 Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate Nitzbon, Jan Langer, Moritz Martin, Léo CP Westermann, Sebastian Schneider von Deimling, Thomas Boike, Julia 2021-03-19 application/pdf https://epic.awi.de/id/eprint/53879/ https://epic.awi.de/id/eprint/53879/1/Nitzbon-et-al_2021_Effects-of-multi-scale-heterogeneity.pdf https://doi.org/10.5194/tc-15-1399-2021 https://hdl.handle.net/10013/epic.b24242c3-0e59-43cf-981c-450b169ae50d unknown Copernicus GmbH https://epic.awi.de/id/eprint/53879/1/Nitzbon-et-al_2021_Effects-of-multi-scale-heterogeneity.pdf Nitzbon, J. orcid:0000-0001-7205-6298 , Langer, M. orcid:0000-0002-2704-3655 , Martin, L. C. , Westermann, S. , Schneider von Deimling, T. orcid:0000-0002-4140-0495 and Boike, J. orcid:0000-0002-5875-2112 (2021) Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate , The Cryosphere, 15 (3), pp. 1399-1422 . doi:10.5194/tc-15-1399-2021 <https://doi.org/10.5194/tc-15-1399-2021> , hdl:10013/epic.b24242c3-0e59-43cf-981c-450b169ae50d EPIC3The Cryosphere, Copernicus GmbH, 15(3), pp. 1399-1422, ISSN: 1994-0424 Article isiRev 2021 ftawi https://doi.org/10.5194/tc-15-1399-2021 2024-04-23T23:38:07Z In continuous permafrost lowlands, thawing of ice-rich deposits and melting of massive ground ice lead to abrupt landscape changes called thermokarst, which have widespread consequences on the thermal, hydrological, and biogeochemical state of the subsurface. However, macro-scale land surface models (LSMs) do not resolve such localized subgrid-scale processes and could hence miss key feedback mechanisms and complexities which affect permafrost degradation and the potential liberation of soil organic carbon in high latitudes. Here, we extend the CryoGrid 3 permafrost model with a multi-scale tiling scheme which represents the spatial heterogeneities of surface and subsurface conditions in ice-rich permafrost lowlands. We conducted numerical simulations using stylized model setups to assess how different representations of micro- and meso-scale heterogeneities affect landscape evolution pathways and the amount of permafrost degradation in response to climate warming. At the micro-scale, the terrain was assumed to be either homogeneous or composed of ice-wedge polygons, and at the meso-scale it was assumed to be either homogeneous or resembling a low-gradient slope. We found that by using different model setups and parameter sets, a multitude of landscape evolution pathways could be simulated which correspond well to observed thermokarst landscape dynamics across the Arctic. These pathways include the formation, growth, and gradual drainage of thaw lakes; the transition from low-centred to high-centred ice-wedge polygons; and the formation of landscape-wide drainage systems due to melting of ice wedges. Moreover, we identified several feedback mechanisms due to lateral transport processes which either stabilize or destabilize the thermokarst terrain. The amount of permafrost degradation in response to climate warming was found to depend primarily on the prevailing hydrological conditions, which in turn are crucially affected by whether or not micro- and/or meso-scale heterogeneities were considered in the model ... Article in Journal/Newspaper Arctic Ice permafrost The Cryosphere Thermokarst wedge* Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) The Cryosphere 15 3 1399 1422 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
In continuous permafrost lowlands, thawing of ice-rich deposits and melting of massive ground ice lead to abrupt landscape changes called thermokarst, which have widespread consequences on the thermal, hydrological, and biogeochemical state of the subsurface. However, macro-scale land surface models (LSMs) do not resolve such localized subgrid-scale processes and could hence miss key feedback mechanisms and complexities which affect permafrost degradation and the potential liberation of soil organic carbon in high latitudes. Here, we extend the CryoGrid 3 permafrost model with a multi-scale tiling scheme which represents the spatial heterogeneities of surface and subsurface conditions in ice-rich permafrost lowlands. We conducted numerical simulations using stylized model setups to assess how different representations of micro- and meso-scale heterogeneities affect landscape evolution pathways and the amount of permafrost degradation in response to climate warming. At the micro-scale, the terrain was assumed to be either homogeneous or composed of ice-wedge polygons, and at the meso-scale it was assumed to be either homogeneous or resembling a low-gradient slope. We found that by using different model setups and parameter sets, a multitude of landscape evolution pathways could be simulated which correspond well to observed thermokarst landscape dynamics across the Arctic. These pathways include the formation, growth, and gradual drainage of thaw lakes; the transition from low-centred to high-centred ice-wedge polygons; and the formation of landscape-wide drainage systems due to melting of ice wedges. Moreover, we identified several feedback mechanisms due to lateral transport processes which either stabilize or destabilize the thermokarst terrain. The amount of permafrost degradation in response to climate warming was found to depend primarily on the prevailing hydrological conditions, which in turn are crucially affected by whether or not micro- and/or meso-scale heterogeneities were considered in the model ... |
format |
Article in Journal/Newspaper |
author |
Nitzbon, Jan Langer, Moritz Martin, Léo CP Westermann, Sebastian Schneider von Deimling, Thomas Boike, Julia |
spellingShingle |
Nitzbon, Jan Langer, Moritz Martin, Léo CP Westermann, Sebastian Schneider von Deimling, Thomas Boike, Julia Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
author_facet |
Nitzbon, Jan Langer, Moritz Martin, Léo CP Westermann, Sebastian Schneider von Deimling, Thomas Boike, Julia |
author_sort |
Nitzbon, Jan |
title |
Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
title_short |
Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
title_full |
Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
title_fullStr |
Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
title_full_unstemmed |
Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
title_sort |
effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate |
publisher |
Copernicus GmbH |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/53879/ https://epic.awi.de/id/eprint/53879/1/Nitzbon-et-al_2021_Effects-of-multi-scale-heterogeneity.pdf https://doi.org/10.5194/tc-15-1399-2021 https://hdl.handle.net/10013/epic.b24242c3-0e59-43cf-981c-450b169ae50d |
genre |
Arctic Ice permafrost The Cryosphere Thermokarst wedge* |
genre_facet |
Arctic Ice permafrost The Cryosphere Thermokarst wedge* |
op_source |
EPIC3The Cryosphere, Copernicus GmbH, 15(3), pp. 1399-1422, ISSN: 1994-0424 |
op_relation |
https://epic.awi.de/id/eprint/53879/1/Nitzbon-et-al_2021_Effects-of-multi-scale-heterogeneity.pdf Nitzbon, J. orcid:0000-0001-7205-6298 , Langer, M. orcid:0000-0002-2704-3655 , Martin, L. C. , Westermann, S. , Schneider von Deimling, T. orcid:0000-0002-4140-0495 and Boike, J. orcid:0000-0002-5875-2112 (2021) Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate , The Cryosphere, 15 (3), pp. 1399-1422 . doi:10.5194/tc-15-1399-2021 <https://doi.org/10.5194/tc-15-1399-2021> , hdl:10013/epic.b24242c3-0e59-43cf-981c-450b169ae50d |
op_doi |
https://doi.org/10.5194/tc-15-1399-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
3 |
container_start_page |
1399 |
op_container_end_page |
1422 |
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1799475987143983104 |