Dr. Matthew Church
Associate Professor, University of Montana, Flathead Lake Biological Station
Lab Website | Abstract
Eddy-driven variability in nitrification in the subtropical North Pacific Ocean
Tuesday, September 3
12 PM
AHF 153 (Torrey Webb Room)
Abstract: Nitrification is a key step in the marine nitrogen cycle, controlling oxidation of reduced nitrogen in the ocean. Mesoscale eddies, which vertically perturb isopycnal surfaces within the main pycnocline, are thought to play important roles in upper ocean biogeochemical processes; however, potential impacts of eddies on microbial nitrogen cycling in the dimly-lit mesopelagic waters remains largely unknown. In this talk I will summarize on-going work examining how eddies influence the export of particulate nitrogen (PN), rates of nitrification, and the abundances and spatial distributions of nitrifying Archaea (using the ammonia-monooxygenase gene [amoA] as a biomarker) in the oligotrophic waters of the North Pacific Ocean. Eddies influence upper ocean nutrient pools and fluxes, shape the distributions of nitrifying microorganisms and rates of nitrification in the mesopelagic waters. These results suggest that eddy-mediated changes to the upper ocean can have important roles in modifying nitrogen transformation in the interior waters of the ocean.
No comments:
Post a Comment