BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:The impact of realistic topographic representation on the paramete
 risation of lee wave energy flux - Lois Baker\, Department of Civil and En
 vironmental Engineering\, Imperial College London
DTSTART:20220314T130000Z
DTEND:20220314T140000Z
UID:TALK170963@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION:Oceanic lee waves are generated when quasi-steady flows intera
 ct with rough topography at the bottom of the ocean. These internal waves 
 provide an important sink of energy and momentum from the mean flow\, espe
 cially in the Southern Ocean where they are a leading order mechanism for 
 diapycnal mixing. Linear theory with a spectral representation of abyssal 
 hill topography is generally used to estimate lee wave generation for use 
 in parameterisations\, and has been verified against idealised simulations
 . Here\, we use a realistic wave resolving simulation of the Drake Passage
  to investigate the utility of such parameterisations for areas of complex
  large scale topography. The flow is often blocked and split by large ampl
 itude topographic features\, calling into question the spectral representa
 tion of small scale topography for lee wave generation. We show that the n
 ature of lee waves in such regions can be misrepresented by a spectral app
 roach to topographic representation\, leading to an overestimate of wave e
 nergy flux and an underestimate of wave nonlinearity.
LOCATION:MR5\, CMS
END:VEVENT
END:VCALENDAR