EXPLORING A MICROBIAL ECOSYSTEM APPROACH TO MODELING DEEP OCEAN BIOGEOCHEMICAL CYCLES
Though microbial respiration of organic matter in the deep ocean governs ocean and atmosphere biogeochemistry, it is not represented mechanistically in current global biogeochemical models. We seek approaches that are feasible for a global resolution, yet still reflect the enormous biodiversity of the deep microbial community and its associated metabolic pathways. We use a framework that represents microbial physiology as redox reactions from which microbial community structure emerges, based on the availability of the electron acceptor that maximizes fitness. The prototype model resolves two dominant respiratory pathways- reduction of oxygen and nitrate- and associated microbial functional types. We use this biological model in combination with a two-dimensional ocean model to explore the organization, biogeochemistry, and ecology of oxygen minimum zones. Intensified upwelling and lateral transport conspire to produce an oxygen minimum at mid-depth, populated by the anaerobic denitrifiers. We will discuss how the extent of the oxygen minimum region is regulated by circulation and the feedbacks with the microbial ecology.
Zakem, E., Massachusetts Institute of Technology, USA, email@example.com
Follows, M., Massachusetts Institute of Technology, USA, firstname.lastname@example.org
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall
Presentation is given by student: Yes