Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands
This thesis addresses two uncertainties concerning permafrost thaw in peatlands by quantifying: (i) how soil characteristics and collapse-scar feature morphology interact to influence lateral expansion rates of thermokarst features; and (ii) the consequences of thermokarst expansion rates on terrest...
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University of Guelph
2018
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ftunivguelph:oai:atrium.lib.uoguelph.ca:10214/12603 2024-06-23T07:53:37+00:00 Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands Zwanenburg, Natalie Turetsky, Merritt 2018-04-10 application/pdf http://hdl.handle.net/10214/12603 en eng University of Guelph http://hdl.handle.net/10214/12603 Attribution-NonCommercial-NoDerivs 2.5 Canada http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ Thermokarst Permafrost Terrestrial Carbon Storage Lateral Expansion Rates Collapse-Scar Features Grainsize Thesis 2018 ftunivguelph 2024-06-04T23:58:45Z This thesis addresses two uncertainties concerning permafrost thaw in peatlands by quantifying: (i) how soil characteristics and collapse-scar feature morphology interact to influence lateral expansion rates of thermokarst features; and (ii) the consequences of thermokarst expansion rates on terrestrial carbon storage. I collected peat cores within and adjacent to collapse-scar features to develop a chronosequence of time-following-thaw. I explored feature morphology and soil characteristics using grain size analysis. Radiocarbon dating of the organic and mineral soils from each peat core was used to quantify lateral expansion and peat accumulation rates. Grain size was uniform across the study region, suggesting other physical characteristics (such as ice content and organic matter) influence thaw rate of collapse-scar features. Permafrost carbon stocks rapidly decrease post-thaw, while new surface peat carbon gradually accumulates. My findings suggest anywhere from 250-700 years of surface peat accumulation is required to compensate for deep permafrost carbon losses. Northern Scientific Training Program Thesis Ice permafrost Thermokarst University of Guelph: DSpace digital archive |
institution |
Open Polar |
collection |
University of Guelph: DSpace digital archive |
op_collection_id |
ftunivguelph |
language |
English |
topic |
Thermokarst Permafrost Terrestrial Carbon Storage Lateral Expansion Rates Collapse-Scar Features Grainsize |
spellingShingle |
Thermokarst Permafrost Terrestrial Carbon Storage Lateral Expansion Rates Collapse-Scar Features Grainsize Zwanenburg, Natalie Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands |
topic_facet |
Thermokarst Permafrost Terrestrial Carbon Storage Lateral Expansion Rates Collapse-Scar Features Grainsize |
description |
This thesis addresses two uncertainties concerning permafrost thaw in peatlands by quantifying: (i) how soil characteristics and collapse-scar feature morphology interact to influence lateral expansion rates of thermokarst features; and (ii) the consequences of thermokarst expansion rates on terrestrial carbon storage. I collected peat cores within and adjacent to collapse-scar features to develop a chronosequence of time-following-thaw. I explored feature morphology and soil characteristics using grain size analysis. Radiocarbon dating of the organic and mineral soils from each peat core was used to quantify lateral expansion and peat accumulation rates. Grain size was uniform across the study region, suggesting other physical characteristics (such as ice content and organic matter) influence thaw rate of collapse-scar features. Permafrost carbon stocks rapidly decrease post-thaw, while new surface peat carbon gradually accumulates. My findings suggest anywhere from 250-700 years of surface peat accumulation is required to compensate for deep permafrost carbon losses. Northern Scientific Training Program |
author2 |
Turetsky, Merritt |
format |
Thesis |
author |
Zwanenburg, Natalie |
author_facet |
Zwanenburg, Natalie |
author_sort |
Zwanenburg, Natalie |
title |
Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands |
title_short |
Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands |
title_full |
Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands |
title_fullStr |
Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands |
title_full_unstemmed |
Characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in Interior Alaskan peatlands |
title_sort |
characteristics of ice-rich permafrost soils and their effect on thermokarst expansion rates in interior alaskan peatlands |
publisher |
University of Guelph |
publishDate |
2018 |
url |
http://hdl.handle.net/10214/12603 |
genre |
Ice permafrost Thermokarst |
genre_facet |
Ice permafrost Thermokarst |
op_relation |
http://hdl.handle.net/10214/12603 |
op_rights |
Attribution-NonCommercial-NoDerivs 2.5 Canada http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ |
_version_ |
1802645370264616960 |