Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands
Inland aquatic systems such as lakes, rivers, and wetlands are pivotal in cycling carbon between the landscape and the atmosphere. However, as global air temperatures increase and precipitation patterns continue to change, their roles as net carbon sources or sinks will become uncertain. New carbon...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Florida State University
2023
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ftfloridasu:oai:diginole.lib.fsu.edu:fsu_927969 2024-09-09T19:27:35+00:00 Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands Kurek, Martin Roman (author) Spencer, Robert G. M. (professor directing dissertation) Marshall, Alan G. (Alan George), 1944- (university representative) Chanton, Jeffrey P. (committee member) Mason, Olivia Underwood (committee member) Wickland, Kimberly P. (committee member) Florida State University (degree granting institution) College of Arts and Sciences (degree granting college) Department of Earth, Ocean, and Atmospheric Science (degree granting department) 2023 computer online resource 1 online resource (226 pages) application/pdf https://repository.lib.fsu.edu/islandora/object/fsu%3A927969/datastream/TN/view/Molecular%20Composition%20and%20Physiographic%20Controls%20of%20Dissolved%20Organic%20Matter%20across%20North%20American%20Lakes%20and%20Wetlands.jpg English eng Florida State University fsu:927969 iid: Kurek_fsu_0071E_18141 https://repository.lib.fsu.edu/islandora/object/fsu%3A927969/datastream/TN/view/Molecular%20Composition%20and%20Physiographic%20Controls%20of%20Dissolved%20Organic%20Matter%20across%20North%20American%20Lakes%20and%20Wetlands.jpg Chemical oceanography Text doctoral thesis 2023 ftfloridasu 2024-08-27T23:44:02Z Inland aquatic systems such as lakes, rivers, and wetlands are pivotal in cycling carbon between the landscape and the atmosphere. However, as global air temperatures increase and precipitation patterns continue to change, their roles as net carbon sources or sinks will become uncertain. New carbon sources will become available to aquatic systems in regions such as the permafrost zone in the northern high latitudes or in temperate forested wetlands where increased precipitation connects waterbodies to upland catchments. In dryer regions, the water residence time of aquatic systems will increase, restricting the inputs of organic carbon from the surrounding landscape, but also amplifying its internal production and degradation. This dissertation aims to investigate the sources and molecular properties of dissolved organic matter (DOM) across northern high-latitude lakes and temperate North American wetlands and to consider its potential role in the carbon cycle as these regions continue to experience changes in temperature and precipitation. Using a combined approach of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), optical and fluorescence spectroscopy, and mediated electrochemical oxidation and reduction, molecular-level DOM composition was revealed and related to large-scale climate and physiographic variables. Specifically, the goals of this dissertation were to characterize DOM in lakes spanning the Western North American Arctic with respect to differences in seasonality and climate (Chapter 2) as well as hydrology and landscape characteristics (Chapter 3). Using these findings, a quantitative relationship between molecular level-composition and bulk electrochemical DOM properties was also assessed (Chapter 4). Finally, DOM properties were surveyed across various wetland types across temperate North American regions and further examined between surface waters and porewaters as well as during different annual hydroperiods (Chapter 5). DOM composition and dissolved organic carbon ... Doctoral or Postdoctoral Thesis Arctic permafrost Florida State University: DigiNole Commons Arctic |
institution |
Open Polar |
collection |
Florida State University: DigiNole Commons |
op_collection_id |
ftfloridasu |
language |
English |
topic |
Chemical oceanography |
spellingShingle |
Chemical oceanography Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands |
topic_facet |
Chemical oceanography |
description |
Inland aquatic systems such as lakes, rivers, and wetlands are pivotal in cycling carbon between the landscape and the atmosphere. However, as global air temperatures increase and precipitation patterns continue to change, their roles as net carbon sources or sinks will become uncertain. New carbon sources will become available to aquatic systems in regions such as the permafrost zone in the northern high latitudes or in temperate forested wetlands where increased precipitation connects waterbodies to upland catchments. In dryer regions, the water residence time of aquatic systems will increase, restricting the inputs of organic carbon from the surrounding landscape, but also amplifying its internal production and degradation. This dissertation aims to investigate the sources and molecular properties of dissolved organic matter (DOM) across northern high-latitude lakes and temperate North American wetlands and to consider its potential role in the carbon cycle as these regions continue to experience changes in temperature and precipitation. Using a combined approach of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), optical and fluorescence spectroscopy, and mediated electrochemical oxidation and reduction, molecular-level DOM composition was revealed and related to large-scale climate and physiographic variables. Specifically, the goals of this dissertation were to characterize DOM in lakes spanning the Western North American Arctic with respect to differences in seasonality and climate (Chapter 2) as well as hydrology and landscape characteristics (Chapter 3). Using these findings, a quantitative relationship between molecular level-composition and bulk electrochemical DOM properties was also assessed (Chapter 4). Finally, DOM properties were surveyed across various wetland types across temperate North American regions and further examined between surface waters and porewaters as well as during different annual hydroperiods (Chapter 5). DOM composition and dissolved organic carbon ... |
author2 |
Kurek, Martin Roman (author) Spencer, Robert G. M. (professor directing dissertation) Marshall, Alan G. (Alan George), 1944- (university representative) Chanton, Jeffrey P. (committee member) Mason, Olivia Underwood (committee member) Wickland, Kimberly P. (committee member) Florida State University (degree granting institution) College of Arts and Sciences (degree granting college) Department of Earth, Ocean, and Atmospheric Science (degree granting department) |
format |
Doctoral or Postdoctoral Thesis |
title |
Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands |
title_short |
Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands |
title_full |
Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands |
title_fullStr |
Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands |
title_full_unstemmed |
Molecular Composition and Physiographic Controls of Dissolved Organic Matter across North American Lakes and Wetlands |
title_sort |
molecular composition and physiographic controls of dissolved organic matter across north american lakes and wetlands |
publisher |
Florida State University |
publishDate |
2023 |
url |
https://repository.lib.fsu.edu/islandora/object/fsu%3A927969/datastream/TN/view/Molecular%20Composition%20and%20Physiographic%20Controls%20of%20Dissolved%20Organic%20Matter%20across%20North%20American%20Lakes%20and%20Wetlands.jpg |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_relation |
fsu:927969 iid: Kurek_fsu_0071E_18141 https://repository.lib.fsu.edu/islandora/object/fsu%3A927969/datastream/TN/view/Molecular%20Composition%20and%20Physiographic%20Controls%20of%20Dissolved%20Organic%20Matter%20across%20North%20American%20Lakes%20and%20Wetlands.jpg |
_version_ |
1809897008113123328 |