Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers
Thesis: Ph. D., 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), 2017.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2017
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| Online Access: | http://hdl.handle.net/1721.1/108917 |
| _version_ | 1811072532812398592 |
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| author | Manning, Cara Charlotte Marie |
| author2 | Rachel H.R. Stanley and David P. Nicholson. |
| author_facet | Rachel H.R. Stanley and David P. Nicholson. Manning, Cara Charlotte Marie |
| author_sort | Manning, Cara Charlotte Marie |
| collection | MIT |
| description | Thesis: Ph. D., 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), 2017. |
| first_indexed | 2024-09-23T09:07:25Z |
| format | Thesis |
| id | mit-1721.1/108917 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T09:07:25Z |
| publishDate | 2017 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1089172019-04-10T20:53:56Z Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers Manning, Cara Charlotte Marie Rachel H.R. Stanley and David P. Nicholson. 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. Joint Program in Oceanography/Applied Ocean Science and Engineering. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Gases Analysis Chemical oceanography Thesis: Ph. D., 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), 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 185-213). In this thesis, I use coastal measurements of dissolved O₂ and inert gases to provide insight into the chemical, biological, and physical processes that impact the oceanic cycles of carbon and dissolved gases. Dissolved O₂ concentration and triple isotopic composition trace net and gross biological productivity. The saturation states of inert gases trace physical processes, such as air-water gas exchange, temperature change, and mixing, that affect all gases. First, I developed a field-deployable system that measures Ne, Ar, Kr, and Xe gas ratios in water. It has precision and accuracy of 1 % or better, enables near-continuous measurements, and has much lower cost compared to existing laboratory-based methods. The system will increase the scientific community's access to use dissolved noble gases as environmental tracers. Second, I measured O₂ and five noble gases during a cruise in Monterey Bay, California. I developed a vertical model and found that accurately parameterizing bubble-mediated gas exchange was necessary to accurately simulate the He and Ne measurements. I present the first comparison of multiple gas tracer, incubation, and sediment trap-based productivity estimates in the coastal ocean. Net community production estimated from ¹⁵NO₃⁻ uptake and 02 /Ar gave equivalent results at steady state. Underway O₂/Ar measurements revealed submesoscale variability that was not apparent from daily incubations. Third, I quantified productivity by O₂ mass balance and air-water gas exchange by dual tracer (³He/SF₆ ) release during ice melt in the Bras d'Or Lakes, a Canadian estuary. The gas transfer velocity at >90 % ice cover was 6 % of the rate for nearly ice-free conditions. Rates of volumetric gross primary production were similar when the estuary was completely ice-covered and ice-free, and the ecosystem was on average net autotrophic during ice melt and net heterotrophic following ice melt. I present a method for incorporating the isotopic composition of H₂O into the O₂ isotope-based productivity calculations, which increases the estimated gross primary production in this study by 46-97 %. In summary, I describe a new noble gas analysis system and apply O₂ and inert gas observations in new ways to study chemical, biological, and physical processes in coastal waters. by Cara Charlotte Marie Manning. Ph. D. 2017-05-11T19:55:35Z 2017-05-11T19:55:35Z 2017 2017 Thesis http://hdl.handle.net/1721.1/108917 986241449 eng MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 213 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Joint Program in Oceanography/Applied Ocean Science and Engineering. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Gases Analysis Chemical oceanography Manning, Cara Charlotte Marie Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| title | Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| title_full | Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| title_fullStr | Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| title_full_unstemmed | Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| title_short | Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| title_sort | insight into chemical biological and physical processes in coastal waters from dissolved oxygen and inert gas tracers |
| topic | Joint Program in Oceanography/Applied Ocean Science and Engineering. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Gases Analysis Chemical oceanography |
| url | http://hdl.handle.net/1721.1/108917 |
| work_keys_str_mv | AT manningcaracharlottemarie insightintochemicalbiologicalandphysicalprocessesincoastalwatersfromdissolvedoxygenandinertgastracers |