Analysis of Thermal Properties of Permafrost, and Modeling
Permafrost thaw has a potentially large impact on the global climate system through release of carbon gas that has been stored as organic carbon for up to 400,000 years. System feedbacks between permafrost carbon content, microbial decomposition rates, ground temperature, and greenhouse gas radiativ...
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ftbatescollege:oai:scarab.bates.edu:geology_theses-1043 2023-05-15T17:55:21+02:00 Analysis of Thermal Properties of Permafrost, and Modeling Szatkowski, Mary Elizabeth 2018-05-01T07:00:00Z application/pdf https://scarab.bates.edu/geology_theses/41 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1043&context=geology_theses unknown SCARAB https://scarab.bates.edu/geology_theses/41 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1043&context=geology_theses Standard Theses Permafrost Climate Thermal Properties text 2018 ftbatescollege 2022-03-22T09:19:48Z Permafrost thaw has a potentially large impact on the global climate system through release of carbon gas that has been stored as organic carbon for up to 400,000 years. System feedbacks between permafrost carbon content, microbial decomposition rates, ground temperature, and greenhouse gas radiative forcing make the permfrost system susceptible to rate induced tipping. Individual components of the permafrost system are examined to contribute to understanding of the timing and behavior of system tipping. A Permafrost Bomb model is created to evaluate the long term decomposition ground temperature feedback behavior. Results showed several system tippings with decreasing successive amplitude under a constant atmospheric temperature forcing. This resembles the global temperature behavior of the PETM hyperthermals, supporting evidence of permafrost thaw influence on paleoclimate events. Six years of ground temperature data from a Kapp Linne borehole was analyzed for the thermal diffusivity through time and depth. Increasing atmospheric temperature is associated with greater thermal diffusivity and more effects from latent heat transfer, which were observed far below the active layer. Considering the results directly from this study and previously published research, a more complete model for permafrost is proposed. This model considers ground and atmospheric conditions for temperature and carbon content. Overall, these findings are applicable in permafrost and climate modeling for the purpose of understanding how the permafrost system may change and impact the global climate on both the geologic time scale and human lifespan. Text permafrost Bates College: SCARAB (Scholarly Communication and Research at Bates) |
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Bates College: SCARAB (Scholarly Communication and Research at Bates) |
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topic |
Permafrost Climate Thermal Properties |
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Permafrost Climate Thermal Properties Szatkowski, Mary Elizabeth Analysis of Thermal Properties of Permafrost, and Modeling |
topic_facet |
Permafrost Climate Thermal Properties |
description |
Permafrost thaw has a potentially large impact on the global climate system through release of carbon gas that has been stored as organic carbon for up to 400,000 years. System feedbacks between permafrost carbon content, microbial decomposition rates, ground temperature, and greenhouse gas radiative forcing make the permfrost system susceptible to rate induced tipping. Individual components of the permafrost system are examined to contribute to understanding of the timing and behavior of system tipping. A Permafrost Bomb model is created to evaluate the long term decomposition ground temperature feedback behavior. Results showed several system tippings with decreasing successive amplitude under a constant atmospheric temperature forcing. This resembles the global temperature behavior of the PETM hyperthermals, supporting evidence of permafrost thaw influence on paleoclimate events. Six years of ground temperature data from a Kapp Linne borehole was analyzed for the thermal diffusivity through time and depth. Increasing atmospheric temperature is associated with greater thermal diffusivity and more effects from latent heat transfer, which were observed far below the active layer. Considering the results directly from this study and previously published research, a more complete model for permafrost is proposed. This model considers ground and atmospheric conditions for temperature and carbon content. Overall, these findings are applicable in permafrost and climate modeling for the purpose of understanding how the permafrost system may change and impact the global climate on both the geologic time scale and human lifespan. |
format |
Text |
author |
Szatkowski, Mary Elizabeth |
author_facet |
Szatkowski, Mary Elizabeth |
author_sort |
Szatkowski, Mary Elizabeth |
title |
Analysis of Thermal Properties of Permafrost, and Modeling |
title_short |
Analysis of Thermal Properties of Permafrost, and Modeling |
title_full |
Analysis of Thermal Properties of Permafrost, and Modeling |
title_fullStr |
Analysis of Thermal Properties of Permafrost, and Modeling |
title_full_unstemmed |
Analysis of Thermal Properties of Permafrost, and Modeling |
title_sort |
analysis of thermal properties of permafrost, and modeling |
publisher |
SCARAB |
publishDate |
2018 |
url |
https://scarab.bates.edu/geology_theses/41 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1043&context=geology_theses |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Standard Theses |
op_relation |
https://scarab.bates.edu/geology_theses/41 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1043&context=geology_theses |
_version_ |
1766163276195954688 |