[Eoas-seminar] EOAS Colloquium this Friday at 3pm

[eoas-seminar at lists.fsu.edu]

Please join us for this week's EOAS Colloquium Speaker on Friday Nov 
18th at 3pm in EOA 1050

Dr. Eric Chassignet, FSU

TITLE:High-Resolution North Atlantic Ocean Modeling


ABSTRACT: In Chassignet and Xu (2017), the authors argued that the next 
threshold for a significant improvement in western boundary currents 
representation (i.e., the Gulf Stream in the North Atlantic) is an 
increase in the horizontal resolution from the eddying 1/10° to 
submesoscale enabled 1/50° grid spacing. They showed that, as the 
resolution is increased to 1/50° (~ 1.5 km at mid-latitudes) from 1/12°, 
the representation of Gulf Stream penetration and associated 
recirculating gyres shifts from unrealistic to realistic and that the 
penetration of eddy kinetic energy into the deep ocean is drastically 
different and closely resembles observations. They however noted several 
discrepancies between the high-resolution 1/50° numerical simulation and 
observations. The first one wasno variability in the sea surface height 
spectra wavenumber spectral slope between high/mid-latitudes and the 
equator. The second one was an area of high sea surface height 
variability and surface EKE wider than observed near the New England 
seamount chain which suggests that interactions with the topography may 
be overemphasized in this model configuration. We will show that the 
inclusion of high-resolution bathymetry and tides significantly improve 
the models’ abilities to represent the observed ocean variability and 
Gulf Stream pathway.
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