AOS Seminar: Title 1: Optical differentiation of ecological regimes in the Arctic Ocean. Title 2: Current and Current Shear Observations in the Columbia River from Land and Sea-based X-Band Radar


 
05/01/2014 - 4:00pm to 5:00pm

Please join us for the following AOS Seminar on Thursday, May 1 at 4:00PM in Spiess Hall Room 330.

Speaker: Griet Neukermans, Postdoctoral Researcher, Scripps Institution of Oceanography 

 
Title: Optical differentiation of ecological regimes in the Arctic Ocean.
 
Abstract:
 
Optical measurements available on in situ and remote-sensing platforms are essential to monitor the rapid ecological changes that are taking place in the Arctic Ocean. Our contribution to this monitoring effort focuses on the optical identification of assemblages of particles suspended in seawater that are representative of distinct ecological regimes. We analyze an extensive in situ dataset of the spectral coefficients of light backscattering and absorption by particles in seawater in conjunction with the characteristics of the particle assemblage, including concentration, composition, and size. This dataset from the Chukchi and Beaufort Seas encompasses observations from open waters of the marginal ice zone and off the continental shelf, as well as a massive diatom bloom beneath sea ice. Using hierarchical cluster analysis we show that combined measurement of light backscattering and absorption by particles allows differentiation of various ecological regimes. 
 
and
 
Speaker: Jeff Campana, Scripps Institution of Oceanography
 
Title:  Current and Current Shear Observations in the Columbia River from Land and Sea-based X-Band Radar
 
Abstract:
 
The use of remote sensing techniques in energetic environments such as river mouths has potential for both scientific and navigational applications. The Columbia River mouth is one of the most dangerous river mouths for ships to transit, giving it the name "Graveyard of the Pacific". Techniques will be presented for the inversion of surface current and bathymetry using a ship-born or land-based radar system. A method to observe vertical current shear from radar backscatter will then be proposed.
 
For more information on this event, contact: 
Christopher Verlinden
Event Calendar: 
Location: 
8820 Shellback Way, La Jolla, CA 92037, US