Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest
Boreal forests in permafrost regions make up around one-third of the global forest cover and are an essential component of regional and global climate patterns. Further, climatic change can trigger extensive ecosystem shifts such as the partial disappearance of near surface permafrost or changes to...
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ftcopernicus:oai:publications.copernicus.org:bgd85993 2023-05-15T17:56:12+02:00 Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest Stuenzi, Simone Maria Boike, Julia Cable, William Herzschuh, Ulrike Kruse, Stefan Pestryakova, Ljudmila Schneider v. Deimling, Thomas Westermann, Sebastian Zakharov, Evgenii Langer, Moritz 2020-06-18 application/pdf https://doi.org/10.5194/bg-2020-201 https://www.biogeosciences-discuss.net/bg-2020-201/ eng eng doi:10.5194/bg-2020-201 https://www.biogeosciences-discuss.net/bg-2020-201/ eISSN: 1726-4189 Text 2020 ftcopernicus https://doi.org/10.5194/bg-2020-201 2020-06-22T16:22:00Z Boreal forests in permafrost regions make up around one-third of the global forest cover and are an essential component of regional and global climate patterns. Further, climatic change can trigger extensive ecosystem shifts such as the partial disappearance of near surface permafrost or changes to the vegetation structure and composition. Therefore, our aim is to understand how the interactions between the vegetation, permafrost, and the atmosphere stabilize the forests and the underlying permafrost. Existing model set-ups are often static or are not able to capture important processes such as the vertical structure or the leaf physiological properties. There is a need for a physically based model with a robust radiative transfer scheme through the canopy. A one-dimensional land surface model (CryoGrid) is adapted for the application in vegetated areas by coupling a multilayer canopy model (CLM-ml v0) and is used to reproduce the energy transfer and thermal regime at a study site (N 63.18946, E 118.19596) in mixed boreal forest in Eastern Siberia. We have in-situ soil temperature and radiation measurements, to evaluate the model and demonstrate the capabilities of a coupled multilayer forest-permafrost model to investigate the vertical exchange of radiation, heat, and water. We find that the forests exert a strong control on the thermal state of permafrost through changing the radiation balance and snow cover phenology. The forest cover alters the surface energy balance by inhibiting over 90 % of the solar radiation and suppressing turbulent heat fluxes. Additionally, our simulations reveal a surplus in longwave radiation trapped below the canopy, similar to a greenhouse, which leads to a comparable magnitude in storage heat flux to that simulated at the grassland site. Further, the end of season snow cover is three times greater at the forest site and the onset of the snow melting processes are delayed. Text permafrost Siberia Copernicus Publications: E-Journals |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Boreal forests in permafrost regions make up around one-third of the global forest cover and are an essential component of regional and global climate patterns. Further, climatic change can trigger extensive ecosystem shifts such as the partial disappearance of near surface permafrost or changes to the vegetation structure and composition. Therefore, our aim is to understand how the interactions between the vegetation, permafrost, and the atmosphere stabilize the forests and the underlying permafrost. Existing model set-ups are often static or are not able to capture important processes such as the vertical structure or the leaf physiological properties. There is a need for a physically based model with a robust radiative transfer scheme through the canopy. A one-dimensional land surface model (CryoGrid) is adapted for the application in vegetated areas by coupling a multilayer canopy model (CLM-ml v0) and is used to reproduce the energy transfer and thermal regime at a study site (N 63.18946, E 118.19596) in mixed boreal forest in Eastern Siberia. We have in-situ soil temperature and radiation measurements, to evaluate the model and demonstrate the capabilities of a coupled multilayer forest-permafrost model to investigate the vertical exchange of radiation, heat, and water. We find that the forests exert a strong control on the thermal state of permafrost through changing the radiation balance and snow cover phenology. The forest cover alters the surface energy balance by inhibiting over 90 % of the solar radiation and suppressing turbulent heat fluxes. Additionally, our simulations reveal a surplus in longwave radiation trapped below the canopy, similar to a greenhouse, which leads to a comparable magnitude in storage heat flux to that simulated at the grassland site. Further, the end of season snow cover is three times greater at the forest site and the onset of the snow melting processes are delayed. |
format |
Text |
author |
Stuenzi, Simone Maria Boike, Julia Cable, William Herzschuh, Ulrike Kruse, Stefan Pestryakova, Ljudmila Schneider v. Deimling, Thomas Westermann, Sebastian Zakharov, Evgenii Langer, Moritz |
spellingShingle |
Stuenzi, Simone Maria Boike, Julia Cable, William Herzschuh, Ulrike Kruse, Stefan Pestryakova, Ljudmila Schneider v. Deimling, Thomas Westermann, Sebastian Zakharov, Evgenii Langer, Moritz Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest |
author_facet |
Stuenzi, Simone Maria Boike, Julia Cable, William Herzschuh, Ulrike Kruse, Stefan Pestryakova, Ljudmila Schneider v. Deimling, Thomas Westermann, Sebastian Zakharov, Evgenii Langer, Moritz |
author_sort |
Stuenzi, Simone Maria |
title |
Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest |
title_short |
Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest |
title_full |
Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest |
title_fullStr |
Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest |
title_full_unstemmed |
Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest |
title_sort |
variability of the surface energy balance in permafrost underlain boreal forest |
publishDate |
2020 |
url |
https://doi.org/10.5194/bg-2020-201 https://www.biogeosciences-discuss.net/bg-2020-201/ |
genre |
permafrost Siberia |
genre_facet |
permafrost Siberia |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2020-201 https://www.biogeosciences-discuss.net/bg-2020-201/ |
op_doi |
https://doi.org/10.5194/bg-2020-201 |
_version_ |
1766164304453697536 |