Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments
Thesis: S.M., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2020 Cataloged from student-submitted PDF of thesis. Includes bibliograph...
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ftmit:oai:dspace.mit.edu:1721.1/128993 2023-06-11T04:08:42+02:00 Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments Dabrowski, Jessica Stephanie. Matthew A, Charette. Joint Program in Oceanography/Applied Ocean Science and Engineering. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Woods Hole Oceanographic Institution 2020 108 pages application/pdf https://hdl.handle.net/1721.1/128993 eng eng Massachusetts Institute of Technology https://hdl.handle.net/1721.1/128993 1227037338 MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided. http://dspace.mit.edu/handle/1721.1/7582 Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Thesis 2020 ftmit 2023-05-29T08:38:54Z Thesis: S.M., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2020 Cataloged from student-submitted PDF of thesis. Includes bibliographical references. Arctic marine and lacustrine systems are experiencing rapid warming due to climate change. These changes are especially important at the interface between sediments and surface waters because they are hotspots for biogeochemical transformations such as redox reactions, nutrient consumption and regeneration, organic matter leaching and degradation, and mineral weathering. Radium isotopes (²²³Ra, ²²⁴Ra, ²²⁶Ra, ²²⁸Ra) and radon-222, naturally occurring radioactive isotopes produced in sediments, are well-suited as tracers of nutrients, trace metals, and organic matter cycling processes at the sediment-water interface. In this thesis, I have applied radon-222 and the quartet of radium isotopes to study fundamental processes in subarctic lakes and on the Arctic continental shelf. First, radon-222 is used to quantify groundwater discharge into a shallow, tundra lake on the Yukon-Kuskokwim Delta in Alaska in summer of 2017. Radon-derived groundwater fluxes were then paired with methane (CH₄) measurements to determine delivery rates of methane into the lake via groundwater. Groundwater CH₄ fluxes significantly exceeded diffusive air-water fluxes from the lake to the atmosphere, suggesting that groundwater is an important source of CH₄ to Arctic lakes and may drive observed CH₄ emissions. Higher CH₄ emissions were observed compared to those reported previously in high latitude lakes, like due to higher CH₄ concentrations in groundwater. These findings indicate that deltaic lakes across warmer permafrost regions may act as important hotspots for methane release across Arctic landscapes. Then, the quartet of radium isotopes is used to study the impacts of storms and sea ice formation as drivers of ... Thesis Arctic Climate change Ice Kuskokwim permafrost Sea ice Subarctic Tundra Alaska Yukon DSpace@MIT (Massachusetts Institute of Technology) Arctic Yukon |
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DSpace@MIT (Massachusetts Institute of Technology) |
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language |
English |
topic |
Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
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Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Dabrowski, Jessica Stephanie. Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments |
topic_facet |
Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
description |
Thesis: S.M., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2020 Cataloged from student-submitted PDF of thesis. Includes bibliographical references. Arctic marine and lacustrine systems are experiencing rapid warming due to climate change. These changes are especially important at the interface between sediments and surface waters because they are hotspots for biogeochemical transformations such as redox reactions, nutrient consumption and regeneration, organic matter leaching and degradation, and mineral weathering. Radium isotopes (²²³Ra, ²²⁴Ra, ²²⁶Ra, ²²⁸Ra) and radon-222, naturally occurring radioactive isotopes produced in sediments, are well-suited as tracers of nutrients, trace metals, and organic matter cycling processes at the sediment-water interface. In this thesis, I have applied radon-222 and the quartet of radium isotopes to study fundamental processes in subarctic lakes and on the Arctic continental shelf. First, radon-222 is used to quantify groundwater discharge into a shallow, tundra lake on the Yukon-Kuskokwim Delta in Alaska in summer of 2017. Radon-derived groundwater fluxes were then paired with methane (CH₄) measurements to determine delivery rates of methane into the lake via groundwater. Groundwater CH₄ fluxes significantly exceeded diffusive air-water fluxes from the lake to the atmosphere, suggesting that groundwater is an important source of CH₄ to Arctic lakes and may drive observed CH₄ emissions. Higher CH₄ emissions were observed compared to those reported previously in high latitude lakes, like due to higher CH₄ concentrations in groundwater. These findings indicate that deltaic lakes across warmer permafrost regions may act as important hotspots for methane release across Arctic landscapes. Then, the quartet of radium isotopes is used to study the impacts of storms and sea ice formation as drivers of ... |
author2 |
Matthew A, Charette. Joint Program in Oceanography/Applied Ocean Science and Engineering. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Woods Hole Oceanographic Institution |
format |
Thesis |
author |
Dabrowski, Jessica Stephanie. |
author_facet |
Dabrowski, Jessica Stephanie. |
author_sort |
Dabrowski, Jessica Stephanie. |
title |
Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments |
title_short |
Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments |
title_full |
Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments |
title_fullStr |
Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments |
title_full_unstemmed |
Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments |
title_sort |
radium isotopes and radon-222 as tracers of sediment-water interaction in arctic coastal and lacustrine environments |
publisher |
Massachusetts Institute of Technology |
publishDate |
2020 |
url |
https://hdl.handle.net/1721.1/128993 |
geographic |
Arctic Yukon |
geographic_facet |
Arctic Yukon |
genre |
Arctic Climate change Ice Kuskokwim permafrost Sea ice Subarctic Tundra Alaska Yukon |
genre_facet |
Arctic Climate change Ice Kuskokwim permafrost Sea ice Subarctic Tundra Alaska Yukon |
op_relation |
https://hdl.handle.net/1721.1/128993 1227037338 |
op_rights |
MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided. http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768382157698367488 |