[LTER-sbc_all] REMINDER: Fernanda Henderikx Freitas Final Defense Tomorrow Dec 8th 10:00am

[Jenny Dugan]

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> Space-Time variability of bio-optical properties in the Southern California Bight 
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> Defense Date: Tuesday December 8th
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> 10:00 a.m. in the ERI Conference Room (Ellison 6824)
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> Advisor: David Siegel
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> Abstract: 
> My dissertation examines the variability of particles and phytoplankton in the Southern California Bight over various time and space scales. In Chapter One, an underwater glider was used to repeatedly sample the inner and mid-shelf Santa Barbara Channel (from 20 to 70m depth), providing data in detail never before observed. Highly resolved glider data allowed answering questions such as: what is the space-time distribution of phytoplankton and sediments in the coastal Santa Barbara Channel? And, what are the main controls on the variability of these properties? In Chapter Two, the capabilities of the glider dataset were explored further to ask questions that are in the very core of studies in upwelling environments: How important is the cross-shelf exchange of materials to the health of nearshore ecosystems? Is the inner-shelf a source or a sink for particles? And, is the nearshore zone net autotrophic or net heterotrophic? In Chapter Three, a larger scale approach is taken to determine what drives bio-optical variability in the Southern California Bight. This study took advantage of more than 13 years of quality optical imagery from SeaWiFS, MODIS and MERIS sensors, which were spectrally merged using a bio-optical algorithm to increase space-time coverage. The data allowed the observation of daily to seasonal and inter-annual changes in bio-optical properties, as well as long-term trends. Controls on backscatter and chlorophyll were assessed, and surface waves were shown to modulate the amount of suspended materials near the coast, also confirming observations obtained with the glider dataset.
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Jenny Dugan

Marine Science Institute
University of California
Santa Barbara, CA 93106-6150
Phone: 805-893-2675
email: j_dugan at lifesci.ucsb.edu
http://msi.ucsb.edu/people/research-scientists/jenny-dugan () 
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