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We have two NOAA/ University of Michigan Great Lakes seminars scheduled for the week on 9/18. Please find details listed below.

1) *Dr. R.E. Hecky*, United Nations University Chair in African Great Lakes and Rivers, Biology Department
University of Waterloo

Title: "The Great Lakes of Africa and North America: Common Threats, Distinctive Responses, Uncertain Futures"

Date: Wednesday, September 20
Time: 10:30am
Location: NOAA/ GLERL 2205 Commonwealth Blvd., Ann Arbor, MI, 48105

There are only two districts of Great Lakes in the world, the Laurentian and the African Great Lakes, and together they hold over 60% of the globe’s liquid fresh water. The ancient African lakes are remarkable for endemism in their fishes and biota. Their large surface areas and volumes of water support many ecosystem services and resource extractions directly by millions of people, but as great basins they also accumulate the material wastes of the activities of those people. Nearly all the lakes are internationally shared by nations within their catchments and downstream, and consequently require international agreements for their management. All the lakes to different degrees, share or have shared several stresses in common such as eutrophication, contamination by persistent pollutants, disruptive species introductions and climate change. Despite having some common stressors, the sensitivities and responses of the lakes can differ markedly. Comparative studies of the lakes can have value to aquatic scientists and resource managers responsible for individual lakes by challenging unstated assumptions and favored models of lake processes and by evaluating different approaches to solving common problems.

2) *Mr. George Leshkevich*, Research Physical Scientist, NOAA/GLERL

Title: "Satellite SAR Remote Sensing of Great Lakes Ice Cover"

Date: Thursday, September 21
Time: 10:30am
Location: NOAA/ GLERL 2205 Commonwealth Blvd., Ann Arbor, MI, 48105

During the 1997 winter season, shipborne polarimetric backscatter measurements of Great Lakes (freshwater) ice types using the Jet Propulsion Laboratory (JPL) C-band scatterometer, together with surface-based ice physical characterization measurements and environmental parameters were acquired concurrently with RADARSAT and ERS-2 SAR data. This polarimetric data set, composed of over 20 ice types or variations measured at incident angles from 0o to 60o for all polarizations, was processed to radar cross-section and establishes a library of signatures (look-up table) for different ice types to be used in the computer classification of calibrated satellite synthetic aperture radar (SAR) data. Computer analysis of ERS-2 and RADARSAT ScanSAR images of Great Lakes ice cover using a supervised classification technique indicates that different ice types in the ice cover can be identified and mapped and that wind speed and direction can have a strong influence on the backscatter from open water.


If you have any questions or concerns, please email me at kanika.suri@noaa.gov; or call 734-741-2147.

For more information about the seminar series, please visit our website at http://www.glerl.noaa.gov/news/seminars/



Kanika Suri
Web Designer Associate

NOAA Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.,
Ann Arbor, MI

Tel: (734) 741-2147
Fax: (734) 741-2055


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