CASPO Seminar: Dr. Alison Cobb, "Mesoscale signature of the North Atlantic Oscillation and its interaction with the ocean"

03/12/2019 - 3:30pm to 4:30pm
101 Nierenberg Hall
Event Description: 

Dr. Alison Cobb

University of Reading


Abstract: This observational study uses high resolution data to investigate mesoscale signatures of the North Atlantic Oscillation (NAO) in the atmosphere and ocean. The production of spatially high pass (‘mesoscale’) filtered kinetic energy by buoyancy and shear effects in the atmosphere, along with sea surface temperature (SST) and surface currents  in the ocean are described, and a difference with NAO phase is found. In positive NAO  winters, an extension of the Gulf Stream warm core is observed, along with a displacement and acceleration of surface currents. Mesoscale activity in the atmosphere appears  to follow this extension of the warm core of the Gulf Stream. This, we suggest, is a new feature of NAO air-sea interactions which is embedded within the basin scale NAO patterns discussed previously in the literature. Further downstream, mesoscale activity seems to reflect more passively the general poleward migration of synoptic activity in positive NAO conditions.

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Art Miller
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