Modelling Methane Emissions from Arctic Lakes
Climate change in the Arctic is moving at a greater rate than the rest of the world, and the urgency of characterizing greenhouse gas emissions from water bodies located in high latitudes has become a subject of intensive research during the last two decades. Methane (CH4) emissions from freshwater...
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ftqueensuniv:oai:https://qspace.library.queensu.ca:1974/27470 2024-06-02T08:01:23+00:00 Modelling Methane Emissions from Arctic Lakes Hurtado Caicedo, Daniela Civil Engineering Boegman, Leon 2019-11-28T18:38:38Z application/pdf http://hdl.handle.net/1974/27470 eng eng Canadian theses http://hdl.handle.net/1974/27470 Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. methane arctic emissions thesis 2019 ftqueensuniv 2024-05-06T10:47:33Z Climate change in the Arctic is moving at a greater rate than the rest of the world, and the urgency of characterizing greenhouse gas emissions from water bodies located in high latitudes has become a subject of intensive research during the last two decades. Methane (CH4) emissions from freshwater systems are believed to be the most important source of uncertainty in the global greenhouse gas budget, and their positive feedback has been excluded from earth systems models. This powerful gaseous fuel can be emitted to the atmosphere via diffusion or ebullition, with fieldwork suggesting the latter is the primary mode of release. Previous process-based models have been developed in the past to determine these emissions; however, they often require several inputs and lakes characteristics that are not readily available. Bearing these limitations in mind, this study quantifies ebullition during the ice-free season from four kettle oligotrophic lakes located in Arctic Alaska. By using a one-dimensional bulk mixed-layer thermodynamic lake model, temperature profiles were obtained, and a CH4 subroutine was also included to determine ebullition and diffusion fluxes as well as CH4 concentrations in the water column. Following model validation, meteorological data from a general circulation model was then implemented to predict future CH4 sediment emissions and their resulting atmospheric fluxes. Results were validated against published observed data from the literature; the model calculated the temperature profile of the lakes with root mean square errors of <4°C. Accordingly, CH4 water concentrations were modelled with root mean square errors of <<1µM, in both deep and shallow systems. Ebullition fluxes showed a high interannual variability which further validated previous evidence of the high heterogeneity of this process. Results of increases in atmospheric fluxes were significant; under three Representative Concentration Pathways, emissions from all systems are expected to increase at least 21% over the next ... Thesis Arctic Climate change Alaska Queen's University, Ontario: QSpace Arctic |
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Open Polar |
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Queen's University, Ontario: QSpace |
op_collection_id |
ftqueensuniv |
language |
English |
topic |
methane arctic emissions |
spellingShingle |
methane arctic emissions Hurtado Caicedo, Daniela Modelling Methane Emissions from Arctic Lakes |
topic_facet |
methane arctic emissions |
description |
Climate change in the Arctic is moving at a greater rate than the rest of the world, and the urgency of characterizing greenhouse gas emissions from water bodies located in high latitudes has become a subject of intensive research during the last two decades. Methane (CH4) emissions from freshwater systems are believed to be the most important source of uncertainty in the global greenhouse gas budget, and their positive feedback has been excluded from earth systems models. This powerful gaseous fuel can be emitted to the atmosphere via diffusion or ebullition, with fieldwork suggesting the latter is the primary mode of release. Previous process-based models have been developed in the past to determine these emissions; however, they often require several inputs and lakes characteristics that are not readily available. Bearing these limitations in mind, this study quantifies ebullition during the ice-free season from four kettle oligotrophic lakes located in Arctic Alaska. By using a one-dimensional bulk mixed-layer thermodynamic lake model, temperature profiles were obtained, and a CH4 subroutine was also included to determine ebullition and diffusion fluxes as well as CH4 concentrations in the water column. Following model validation, meteorological data from a general circulation model was then implemented to predict future CH4 sediment emissions and their resulting atmospheric fluxes. Results were validated against published observed data from the literature; the model calculated the temperature profile of the lakes with root mean square errors of <4°C. Accordingly, CH4 water concentrations were modelled with root mean square errors of <<1µM, in both deep and shallow systems. Ebullition fluxes showed a high interannual variability which further validated previous evidence of the high heterogeneity of this process. Results of increases in atmospheric fluxes were significant; under three Representative Concentration Pathways, emissions from all systems are expected to increase at least 21% over the next ... |
author2 |
Civil Engineering Boegman, Leon |
format |
Thesis |
author |
Hurtado Caicedo, Daniela |
author_facet |
Hurtado Caicedo, Daniela |
author_sort |
Hurtado Caicedo, Daniela |
title |
Modelling Methane Emissions from Arctic Lakes |
title_short |
Modelling Methane Emissions from Arctic Lakes |
title_full |
Modelling Methane Emissions from Arctic Lakes |
title_fullStr |
Modelling Methane Emissions from Arctic Lakes |
title_full_unstemmed |
Modelling Methane Emissions from Arctic Lakes |
title_sort |
modelling methane emissions from arctic lakes |
publishDate |
2019 |
url |
http://hdl.handle.net/1974/27470 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Alaska |
genre_facet |
Arctic Climate change Alaska |
op_relation |
Canadian theses http://hdl.handle.net/1974/27470 |
op_rights |
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. |
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