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Presenters Notified: November 2012

Program Schedule Posted:November 2012

Abstracts Available: January 2013

Meeting:
17-22 February 2013

Smith, S. R., Scripps Institute of Oceanography, USA, sarahsmith@ucsd.edu
Heal, K. R., University of Washington, USA, kheal@uw.edu
Church, M. J., University of Hawaii, USA, mjchurch@hawaii.edu

HIGH RESOLUTION SAMPLING REVEALS LIGHT-DRIVEN FLUCTUATIONS IN MICROBIAL POPULATION SIZE AND ACTIVITIES AT STATION ALOHA

Particle flux from the surface ocean to depth is regulated by a suite of complex processes that vary on many scales. At Station ALOHA (North Pacific subtropical gyre), historical monthly sampling has revealed an annual pulse in export production in late summer, and while the climatology at Station ALOHA is well-resolved at the seasonal scale, the role of high-frequency variability in influencing this pulse is unknown. From May to October 2012, high-resolution sampling designed to identify this episodic variability was conducted at Station ALOHA as a part of the Hawaii Ocean Experiment - Dynamics between Light and Nutrients (HOE-DYLAN) project. In mid-June, C-MORE Summer Course students sampling as part of HOE-DYLAN revealed that both diatom biomass and particulate matter fluxes were anomalously low relative to the seasonal climatology at ALOHA. Daily and hourly sampling revealed strong fluctuations in the biomass and activities of both microbial auto- and heterotrophs that could be clearly attributed to both diel and mesoscale forcing. These initial data from HOE-DYLAN provide unprecedented insight into the factors that structure microbial population dynamics in this ocean region.

Poster presentation

Session #:SS73
Date: 2/19/2013
Time: 18:00 - 19:30