An investigation of basin-scale controls on upper ocean export and remineralization
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2018. The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
2018
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/9576 2023-05-15T15:15:21+02:00 An investigation of basin-scale controls on upper ocean export and remineralization Black, Erin E. 2018-02 https://hdl.handle.net/1912/9576 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/9576 doi:10.1575/1912/9576 doi:10.1575/1912/9576 Carbon Climatic changes Ocean Thomas G. Thompson (Ship) Cruise TN303 Thesis 2018 ftwhoas https://doi.org/10.1575/1912/9576 2022-05-28T23:00:06Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2018. The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted to decrease the efficiency of the global BCP, however, the magnitude and timescale of this shift is largely uncertain and will likely impact some areas of the global ocean more significantly than others. Therefore, it is imperative that we (1) accurately quantify surface export and remineralization of particulate organic carbon (POC) via the BCP over large regions of the global ocean, (2) examine the factors controlling these POC fluxes and their variability, which includes the cycling of biologically-relevant trace metals, and (3) establish if and how the BCP is changing over time. This thesis focuses on addressing various aspects of these objectives using the 234Th-238U method across basin-scale GEOTRACES transects. First, the export and remineralization of POC were examined across large gradients in productivity, upwelling, community structure, and dissolved oxygen in the southeastern tropical Pacific Ocean. Although low oxygen zones are traditionally thought to have decreased POC flux attenuation relative to other regions of the global ocean and the low oxygen Pacific locations followed this pattern, regions that were functionally anoxic had enhanced attenuation in the upper 400 m. Second, trace metal export and remineralization were quantified across the Pacific transect. Because many trace metals are necessary for the metabolic functions of marine organisms and can co-limit marine productivity, the controls on the cycling of trace metals in the upper ocean were examined. Lastly, POC export was determined across two transects in the Western Arctic Ocean, where light and nutrient availability ... Thesis Arctic Arctic Ocean Climate change Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Arctic Ocean Pacific Woods Hole, MA |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Carbon Climatic changes Ocean Thomas G. Thompson (Ship) Cruise TN303 |
spellingShingle |
Carbon Climatic changes Ocean Thomas G. Thompson (Ship) Cruise TN303 Black, Erin E. An investigation of basin-scale controls on upper ocean export and remineralization |
topic_facet |
Carbon Climatic changes Ocean Thomas G. Thompson (Ship) Cruise TN303 |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2018. The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted to decrease the efficiency of the global BCP, however, the magnitude and timescale of this shift is largely uncertain and will likely impact some areas of the global ocean more significantly than others. Therefore, it is imperative that we (1) accurately quantify surface export and remineralization of particulate organic carbon (POC) via the BCP over large regions of the global ocean, (2) examine the factors controlling these POC fluxes and their variability, which includes the cycling of biologically-relevant trace metals, and (3) establish if and how the BCP is changing over time. This thesis focuses on addressing various aspects of these objectives using the 234Th-238U method across basin-scale GEOTRACES transects. First, the export and remineralization of POC were examined across large gradients in productivity, upwelling, community structure, and dissolved oxygen in the southeastern tropical Pacific Ocean. Although low oxygen zones are traditionally thought to have decreased POC flux attenuation relative to other regions of the global ocean and the low oxygen Pacific locations followed this pattern, regions that were functionally anoxic had enhanced attenuation in the upper 400 m. Second, trace metal export and remineralization were quantified across the Pacific transect. Because many trace metals are necessary for the metabolic functions of marine organisms and can co-limit marine productivity, the controls on the cycling of trace metals in the upper ocean were examined. Lastly, POC export was determined across two transects in the Western Arctic Ocean, where light and nutrient availability ... |
format |
Thesis |
author |
Black, Erin E. |
author_facet |
Black, Erin E. |
author_sort |
Black, Erin E. |
title |
An investigation of basin-scale controls on upper ocean export and remineralization |
title_short |
An investigation of basin-scale controls on upper ocean export and remineralization |
title_full |
An investigation of basin-scale controls on upper ocean export and remineralization |
title_fullStr |
An investigation of basin-scale controls on upper ocean export and remineralization |
title_full_unstemmed |
An investigation of basin-scale controls on upper ocean export and remineralization |
title_sort |
investigation of basin-scale controls on upper ocean export and remineralization |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/9576 |
geographic |
Arctic Arctic Ocean Pacific |
geographic_facet |
Arctic Arctic Ocean Pacific |
genre |
Arctic Arctic Ocean Climate change |
genre_facet |
Arctic Arctic Ocean Climate change |
op_source |
doi:10.1575/1912/9576 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/9576 doi:10.1575/1912/9576 |
op_doi |
https://doi.org/10.1575/1912/9576 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766345721044271104 |