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Articles 1 - 3 of 3
Full-Text Articles in Oceanography and Atmospheric Sciences and Meteorology
Production And Decomposition Of Hydrogen Peroxide By Marine Phytoplankton, Dong-Beom Kim
Production And Decomposition Of Hydrogen Peroxide By Marine Phytoplankton, Dong-Beom Kim
OES Theses and Dissertations
H202 in seawater has complicated sources and sinks. The relative importance of biological regulation of H202 compared to other processes is not well understood. In addition, environmental factors affecting the biological regulation of H202 are largely unknown. Marine phytoplankton was examined for the kinetics of the production and decomposition of H202 in the dark. Effects of varying environmental factors such as light, temperature, salinity, nutrients, amino acids, trace metals and growth phase, were examined. H202 was determined with the scopoletin-fluorescence decay method.
Five out of 11 species produced …
Modeling Nutrient And Plankton Processes In The California Coastal Transition Zone, John Roland Moisan
Modeling Nutrient And Plankton Processes In The California Coastal Transition Zone, John Roland Moisan
OES Theses and Dissertations
Two time- and space-dependent, physical-bio-optical models have been developed for the California Coastal Transition Zone (CTZ) region with the overall objective of understanding and quantifying the processes th at contribute to the spatial and temporal development of nutrient and plankton distributions in the CTZ. The first of these models considers only time- and vertical processes at specific locations in the CTZ. The model food web components include: silicate, nitrate, ammonium, two phytoplankton size fractions, copepods, doliolids, euphausiids and a detritus pool. The wavelength dependent attenuation of the subsurface irradiance field, due to sea water, phytoplankton pigment concentrations and dissolved organic …
The Biogeochemistry Of Hydrogen Sulfide In The Open Ocean, Joël Radford-Knoery
The Biogeochemistry Of Hydrogen Sulfide In The Open Ocean, Joël Radford-Knoery
OES Theses and Dissertations
Hydrogen sulfide is a poorly quantified component of the global sulfur cycle. In seawater, its dissolved species (dissolved sulfide) can react with trace metals to form dissolved complexes and insoluble compounds. Therefore, the study of dissolved° sulfide in the open ocean can yield a better understanding of the biogeochemical cycles of sulfur and trace metals.
The biogeochemical cycling of dissolved sulfide was examined using specially developed sampling and analytical methods. In the western North Atlantic and central Equatorial Pacific Oceans, total dissolved sulfide concentrations ranged from /L; they were highest, in the mixed layer and decreased with depth. The depth …