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SUMMARY:Unveiling complex transport processes in a large deep lake: From c
 oastal upwelling to higher-mode internal waves - Rafael Reiss (University 
 of Cambridge)
DTSTART:20250605T103000Z
DTEND:20250605T113000Z
UID:TALK229306@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Water quality in lakes is closely linked to hydrodynamics and 
 is often dominated by thermal stratification which limits the exchange bet
 ween the upper layers (called the epilimnion) and the deeper layers (calle
 d the hypolimnion). Consequently\, the vertical redistribution of biogeoch
 emical tracers such as dissolved oxygen and nutrients by convective overtu
 rning during winter is a key process in annual lake cycles. In deep lakes\
 , convective cooling often does not reach the deepest layers. Furthermore\
 , convective cooling is weakening due to climate change\, motivating a goo
 d understanding of (i) alternative deepwater renewal mechanisms\, and (ii)
  deepwater dynamics in large deep lakes in general. Understanding deepwate
 r dynamics is crucial because of the role deepwater currents play in media
 ting water-sediment exchanges\, hypolimnetic mixing\, and horizontal and v
 ertical transport.\n\nIn this talk\, I will present results from several s
 tudies conducted in Lake Geneva\, Western Europe's largest lake (max. dept
 h 300 m)\, combining field observations\, 3D numerical modelling\, and par
 ticle tracking. The first part of the talk will cover the dynamics and eco
 logical implications of wintertime coastal upwelling and interbasin exchan
 ge and upwelling\, highlighting their role in deepwater renewal. The secon
 d part of the talk will present recent findings on the importance of diffe
 rent vertical modes of rotationally-modified standing internal waves (i.e.
 \, Kelvin and Poincaré waves) on the deepwater dynamics in Lake Geneva\, 
 highlighting the impact of seemingly negligible but ever-present weak stra
 tification in the deep hypolimnion on the vertical structure of higher ver
 tical-mode Poincaré waves.
LOCATION:Open Plan Area\, Institute for Energy and Environmental Flows\, M
 adingley Rise CB3 0EZ
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