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dc.contributor.authorStanley, Rachel H. R.
dc.coverage.spatialSargasso Sea
dc.date.accessioned2008-01-18T18:59:56Z
dc.date.available2008-01-18T18:59:56Z
dc.date.issued2007-09
dc.identifier.urihttp://hdl.handle.net/1912/2029
dc.descriptionSubmitted 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 September 2007en
dc.description.abstractThe five noble gases (helium, neon, argon, krypton, and xenon) are biologically and chemically inert, making them ideal oceanographic tracers. Additionally, the noble gases have a wide range of solubilities and molecular diffusivities, and thus respond differently to physical forcing. Tritium, an isotope of hydrogen, is useful in tandem with its daughter helium-3 as a tracer for water mass ages. In this thesis, a fourteen month time-series of the five noble gases, helium-3 and tritium was measured at the Bermuda Atlantic Time-series Study (BATS) site. The time-series of five noble gases was used to develop a parameterization of air-sea gas exchange for oligotrophic waters and wind speeds between 0 and 13 m s−1 that explicitly includes bubble processes and that constrains diffusive gas exchange to ± 6% and complete and partial air injection processes to ± 15%. Additionally, the parameterization is based on weeks to seasonal time scales, matching the time scales of many relevant biogeochemical cycles. The time-series of helium isotopes, tritium, argon, and oxygen was used to constrain upper ocean biological production. Specifically, the helium flux gauge technique was used to estimate new production, apparent oxygen utilization rates were used to quantify export production, and euphotic zone seasonal cycles of oxygen and argon were used to determine net community production. The concurrent use of these three methods allows examination of the relationship between the types of production and begins to address a number of apparent inconsistencies in the elemental budgets of carbon, oxygen, and nitrogen.en
dc.description.sponsorshipI received funding towards my graduate research from the Department of Defense (NDSEG fellowship), the National Science Foundation (OCE-0221247), and the Scurlock Fund for research.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherMassachusetts Institute of Technology and Woods Hole Oceanographic Institutionen
dc.relation.ispartofseriesWHOI Thesesen
dc.subjectGases, Rareen_US
dc.subjectBiogeochemical cyclesen_US
dc.subjectOceanus (Ship : 1975-) Cruiseen_US
dc.subjectCape Hatteras (Ship) Cruise BATS196en_US
dc.subjectWeatherbird II (Ship) Cruise BATS190en_US
dc.subjectWeatherbird II (Ship) Cruise BATS191en_US
dc.subjectWeatherbird II (Ship) Cruise BATS192en_US
dc.subjectWeatherbird II (Ship) Cruise BATS193en_US
dc.subjectWeatherbird II (Ship) Cruise BATS194en_US
dc.subjectWeatherbird II (Ship) Cruise BATS195en_US
dc.subjectWeatherbird II (Ship) Cruise BATS198en_US
dc.subjectWeatherbird II (Ship) Cruise BATS199en_US
dc.subjectWeatherbird II (Ship) Cruise BATS200en_US
dc.subjectWeatherbird II (Ship) Cruise BATS201en_US
dc.subjectWeatherbird II (Ship) Cruise BATS202en_US
dc.subjectWeatherbird II (Ship) Cruise BATS203en_US
dc.titleA determination of air-sea gas exchange and upper ocean biological production from five noble gases and tritiugenic helium-3en
dc.typeThesisen
dc.identifier.doi10.1575/1912/2029


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