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White, A. E., Oregon State University, Corvallis, USA, awhite@coas.oregonstate.edu
Whitmire, A. L., Oregon State University, Corvallis, USA, whitmire@coas.oregonstate.edu
Letelier, R. M., Oregon State University, Corvallis, USA, letelier@coas.oregonstate.edu
Kavanaugh, M. T., Oregon State University, Corvallis, USA, mkavanau@coas.oregonstate.edu
Church, M. J., University of Hawaii, Honolulu, USA, mjchurch@hawaii.edu

TIME-SERIES ANALYSES OF PRIMARY PRODUCTIVITY AS A FUNCTION OF ABSORPTION, PIGMENT BASED PHYTOPLANKTON DIVERSITY AND PARTICLE SIZE DISTRIBUTIONS

Direct measurements of net primary productivity at the Hawaii Ocean Time-series (HOT) Station ALOHA in the North Pacific Subtropical gyre reveal a strongly light-driven seasonal cycle of biomass normalized primary productivity (PP) punctuated by episodic surface blooms of large cell-sized organisms in summer months. These episodic and largely uncharacterized blooms lead to significant uncertainties in efforts to model PP. To improve upon the present state of satellite-based algorithms for marine productivity, many researchers have concluded that there is a need for field measurements that combine discrete measurements of phytoplankton physiology and taxonomic composition with classical bio-optics approaches as a means of testing, validating and expanding upon existing remote sensing algorithms. In collaboration with the HOT program, we have initiated time-series measurements of particle size distributions, hyperspectral absorbance and attenuation, optical measurements of particle and pigment concentrations, and CDOM profiles which are being merged with hyperspectral irradiance/radiance to generate PP models for the region. We will present results from these time-series analyses along with flow-thru bio-optical measurements and proxies for PP from a series of cruises of opportunity in the region.

Session #:039
Date: 2/23/2012
Time: 08:45
Location: Ballroom B

Presentation is given by student: No