The biogeochemistry of marine particulate trace metals
Ohnemus, Daniel C.
MetadataShow full item record
KeywordBiogeochemical cycles; Marine chemical ecology; Melville (Ship) Cruise MV1101; Knorr (Ship : 1970-) Cruise KN199; Knorr (Ship : 1970-) Cruise KN204; Roger Revelle (Ship) Cruise RR1202
Marine particles include living and non-living solid components of seawater, representing a dynamic and chemically diverse mixture of phases. Through a combination of method development, basin-scale particulate collection and analyses, modeling, and field experiments, this thesis examines both the distributions of marine particulate trace metals and the underlying processes—inputs, scavenging, vertical and horizontal transport, and biotic uptake—in which marine particles participate. I first present the results of an intercalibration exercise among several US laboratories. We use inter-lab and intra-lab total elemental recoveries of these particles to determine our state of our intercalibration and to identify means of future improvement. We present a new chemical method for dissolution of polyethersulfone filters and compare it to other total particle digestion procedures. I then present the marine particulate distributions of the lithogenic elements Al, Fe, and Ti in the North Atlantic GEOTRACES section. A one-dimensional multi-box model that describes lithogenic particle distributions is also proposed and its parameter sensitivities and potential implications are discussed. I conclude with presentation of results from a series of bottle incubations in iron-limited waters using isotopically labeled Fe-minerals. We demonstrate solubilization of minerals ferrihydrite and fayalite via transfer of isotopic label into suspended particles.
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 2014
Suggested CitationThesis: Ohnemus, Daniel C., "The biogeochemistry of marine particulate trace metals", 2014-02, DOI:10.1575/1912/6353, https://hdl.handle.net/1912/6353
Showing items related by title, author, creator and subject.
FASINEX Frontal Air-Sea Interaction Experiment (January-June 1986) : summaries for FASINEX mooring cruises; phase one: R/V KNORR Cruise 119, phase three: RV/KNORR Cruise 123 Pennington, Nancy J.; Weller, Robert A. (Woods Hole Oceanographic Institution, 1986-10)The Frontal Air-Sea Interaction Experiment (FASINEX) was a study of the response of the upper ocean to atmospheric forcing in the vicinity of an oceanic front in the subtropical convergence zone southwest of Bermuda, the ...
The subduction experiment : cruise report R/V Knorr : cruise number 138 leg XV : subduction 3 mooring recovery cruise, 13-30 June 1993 Trask, Richard P.; Galbraith, Nancy R.; Robbins, Paul E.; Ostrom, William M.; Regier, Lloyd; Pezzoli, Glenn; McPhee, Neil M. (Woods Hole Oceanographic Institution, 1993-12)Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find their way into the upper thermocline. The subduction process and its underlying mechanisms were studied ...
Metcalf, William G.; Stalcup, Marvel C.; Zemanovic, Marguerite E. (Woods Hole Oceanographic Institution, 1974-12)During Cruise 37 of the Research Vessel KNORR,91 hydrographic stations were occupied,most of them in the general area of the Windward Passage, eastern Cayman Basin, Mona Passage and across the Caribbean Sea from Puerto ...