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Subject:
Fall
AGU Special Session
Abstract deadline is Sept 8 at www.agu.org. **********************************************************
OS03: Ocean Biology and Biogeochemistry: Discoveries From Space
Description: The launch of the Coastal Zone Color Scanner (CZCS)
on NASA's Nimbus-7 satellite in 1978 initiated a new era for ocean
biology and biogeochemistry. This proof-of-concept mission showed
that satellite ocean color measurements, i.e. the spectra of sunlight
backscattered out of the ocean, could be used to calculate globally
the concentration of phytoplankton chlorophyll concentration, as
well as other ocean water constituents of biological and biogeochemical
significance. By the mid-1980s, CZCS images were providing the first
synoptic ocean basin and global ocean scale measurements directly
related to biogeochemical and biological processes. Time series
of chlorophyll images from CZCS and subsequent follow-on sensors
such as NASA's Ocean Color and Temperature Sensor (OCTS) and the
Orbimage/NASA SeaWiFS were used to calculate the mean and variability
of basin- to global-scale primary production; to quantify the impacts
of ENSO and other climate signals on ocean phytoplankton biomass
and productivity; to determine seasonal cycles of phytoplankton
biomass on regional to global scales; to provide new quantitative
insights into the relations between biological and circulation/mixing
processes on daily to seasonal timescales; and to improve calculations
of upper ocean heat budgets owing to phytoplankton absorption of
solar irradiance. Numerical modelers of regional to basin scale
ocean processes use the images to initialize simulations, to validate
some of the output fields, and for direct assimilation into coupled
physical/biogeochemical/biological models. New applications are
emerging based on inversions of the water-leaving radiance spectra
coupled with new models of the inherent optical properties of ocean
waters. Invited presentations will highlight the breakthroughs made
possible by the space view of the ocean and by combining satellite
imagery with in situ observations for a time-varying, 3-D description
of ocean processes. Contributed presentations of recent and ongoing
work will highlight new developments, including results obtained
by incorporating satellite products into operational ocean observing
systems.
Conveners
James A Yoder
University of Rhode Island
Graduate School of Oceanography
Narragansett, RI, USA 02882
4018746864
jyoder@gso.uri.edu
David
Siegel
University of California, Santa Barbara
Geography Department
Santa Barbara, CA, USA 93106-4060
805-893-3146
davey@icess.ucsb.edu
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