[Eoas-seminar] Seminar Tuesday March 26 at 3pm on "Observing the oceans with sustained underwater glider networks"

[eoas-seminar at lists.fsu.edu]

Please join us for a Tuesday 3pm Seminar in Room 1050 by PO faculty candidate Dr. Alice Ren of Woods Hole Oceanographic Institution


Title and abstract below.


 Observing the oceans with sustained underwater glider networks

Observing three-dimensional ocean processes on horizontal scales less than 300 km for extended periods of time is a challenge. Satellite observations of the roughly 360 million square kilometers of ocean surface can measure changes at approaching the synoptic time scale, and a collection of drifting autonomous instruments (Argo floats) provides depth data with roughly 300 km x 300 km resolution. With a network of underwater gliders, sustained observation of a region can be achieved, as is presented through examples from the California Underwater Glider Network (CUGN) in the California Current System and gliders in the Gulf Stream. Glider observations of 13+ and 8+ years in the two regions describe the ocean down to 500 m and 1000 m respectively and can track mesoscale (around 100 km) to large-scale (300 km and greater) horizontal variability on intra-annual to multi-year timescales. In the California Current System, the annual cycle of oxygen gas exchange at the ocean surface, interannual temperature and salinity extremes, and the propagation of subthermocline eddies offshore are described. In the Gulf Stream, the annual cycle of mixed layer temperature can be observed as well as, after combining glider and Argo float data, decadal-scale warming of ~1°C over the past 20 years. Future research could include estimating ocean horizontal eddy diffusivities and processes at ocean boundaries including surface gas exchange and flow past topographic features.



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Eric Chassignet
Professor and Director
Center for Ocean-Atmospheric Prediction Studies (COAPS)
Florida State University
2000 Levy Avenue, Building A, Suite 292
P.O. Box 3062741
Tallahassee, FL  32306-2741

Office : (1) 850-645-7288
COAPS  : (1) 850-644-3846
Cell   : (1) 850-524-0033 (urgent matters only)
FAX    : (1) 850-644-4841
E-mail : echassignet at fsu.edu
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