Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles
Thesis: Ph. D., Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2017.
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | Tese |
| Idioma: | eng |
| Publicado em: |
Massachusetts Institute of Technology
2017
|
| Assuntos: | |
| Acesso em linha: | http://hdl.handle.net/1721.1/109057 |
| _version_ | 1826196344486756352 |
|---|---|
| author | Rosengard, Sarah Zhou |
| author2 | Valier Galy and Phoebe Lam. |
| author_facet | Valier Galy and Phoebe Lam. Rosengard, Sarah Zhou |
| author_sort | Rosengard, Sarah Zhou |
| collection | MIT |
| description | Thesis: Ph. D., Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2017. |
| first_indexed | 2024-09-23T10:25:26Z |
| format | Thesis |
| id | mit-1721.1/109057 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T10:25:26Z |
| publishDate | 2017 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1090572022-01-14T19:45:47Z Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles Rosengard, Sarah Zhou Valier Galy and Phoebe Lam. Woods Hole Oceanographic Institution. Joint Program in Chemical Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Joint Program in Chemical Oceanography. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Carbon Carbon dioxide Atmosphere Thesis: Ph. D., Joint Program in Chemical Oceanography (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. Particulate organic carbon (POC) in the ocean and mobilized by rivers on land transfers -0. 1% of global primary productivity to the deep ocean sediments. This small fraction regulates the long-term carbon cycle by removing carbon dioxide from the atmosphere for centuries to millennia. This thesis investigates mechanisms of POC transfer to the deep ocean by analyzing particles collected in transit through two globally significant carbon reservoirs: the Southern Ocean and the Amazon River Basin. These endeavors test the hypothesis that organic matter composition controls the recycling and transfer efficiency of POC to the deep ocean, and illustrate new applications for ramped pyrolysis/oxidation (RPO), a growing method of POC characterization by thermal stability. By coupling RPO to stable and radiocarbon isotope analyses of riverine POC, I quantify three thermally distinct soil organic carbon pools mobilized by the Amazon River, and evaluate the degradability and fate of these different pools during transport to the coastal Atlantic Ocean. More directly, RPO analyses of marine samples suggest that POC transfer in the water column is in fact selective. Observations of consistent biomolecular changes that accompany transport of phytoplankton-derived organic matter to depth across the Southern Ocean support the argument for preferential degradation of specific POC pools in the water column. Combining discussions of POC recycling and transfer across both marine and terrestrial systems offer new perspectives of thermal stability as a proxy for diagenetic stability and POC degradation state. The challenges of interpreting RPO data in these two environments set the stage for applying the technique to more controlled experiments that trace POC from source to long-term sink. by Sarah Zhou Rosengard. Ph. D. 2017-05-12T19:00:59Z 2017-05-12T19:00:59Z 2017 2017 Thesis http://hdl.handle.net/1721.1/109057 986241411 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 273 pages application/pdf t------ sa----- Massachusetts Institute of Technology |
| spellingShingle | Joint Program in Chemical Oceanography. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Carbon Carbon dioxide Atmosphere Rosengard, Sarah Zhou Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| title | Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| title_full | Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| title_fullStr | Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| title_full_unstemmed | Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| title_short | Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| title_sort | novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles |
| topic | Joint Program in Chemical Oceanography. Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Carbon Carbon dioxide Atmosphere |
| url | http://hdl.handle.net/1721.1/109057 |
| work_keys_str_mv | AT rosengardsarahzhou novelanalyticalstrategiesfortracingtheorganiccarboncycleinmarineandriverineparticles |