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Presents

A PhD DISSERTATION DEFENSE

"Nitrogen dynamics in coastal watersheds, beaches,
and the nearshore ocean in the Santa Barbara, California, region"

Blair Goodridge
PhD Candidate
Bren School of Environmental Science & Management

Wednesday, July 16, 2014
11:00 a.m.
Bren Hall Dean's Conference Room (2436)

John Melack, faculty advisor

Blair Goodridge


Abstract
Coastal oceans lie at the boundary of terrestrial ecosystems, receiving a wide array of chemical elements discharged by coastal streams, rivers, and aquifers. Nitrogen is one of the most vital of these elements, as it is essential to the biosynthesis of amino acids, nucleic acids, and proteins, and is often limiting to coastal marine primary production, the foundation of coastal marine food webs. In this talk, I examine the dynamics of nitrogen in two potential source regions to the coastal ocean in Santa Barbara, watersheds and beaches, and investigate the hydrologic and biogeochemical factors that can modulate the potential roles of these regions as nitrogen suppliers to the coastal ocean. I also examine how beach processing can alter the composition of beach pore water dissolved organic carbon using a week-long temperature-controlled laboratory incubation. Finally, I investigate how this alteration can influence the use of beach dissolved inorganic nitrogen that discharges to the coastal ocean by bacterioplankton, which act as dominant drivers of marine nitrogen cycles.