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SUMMARY:Horizontal and vertical transport in a large\, deep lake: Coastal 
 upwelling and higher- mode standing internal waves in Lake Geneva - Rafael
  Reiss\, Department of Earth Sciences\, University of Cambridge
DTSTART:20251103T130000Z
DTEND:20251103T140000Z
UID:TALK236767@talks.cam.ac.uk
CONTACT:Bethan Wynne-Cattanach
DESCRIPTION:In this talk\, I will present results from several studies con
 ducted in Lake Geneva\, Western Europe's largest lake (max. depth 309 m). 
 These studies combine field observations\, 3D numerical modelling\, and La
 grangian particle tracking. The first part of the talk will demonstrate th
 e unexpected role of frequent coastal upwelling events during winter in \n
 deepwater renewal and re-oxygenation of Lake Geneva’s deepest layers whi
 ch routinely experience critically low oxygen levels. This is a process th
 at has long been overlooked but is anticipated to become increasingly impo
 rtant as wintertime convective cooling weakens due \nto climate change.\n\
 nIn the second part\, I will explore the role that different higher vertic
 al-mode standing internal waves play in the lake’s deepwater and nearsho
 re dynamics. Instead of the “classical” two-layer current structure of
  their more widely studied vertical mode-one counterparts\, these \nstandi
 ng wave modes are characterized by three- or four-layer current structures
 . The results shed light on the complex vertical and horizontal structure 
 of these higher vertical-mode internal Kelvin and Poincaré waves and expl
 ain why numerous previous investigations in one \nof the world’s most st
 udied lakes – where the term limnology was coined more than a century ag
 o and where the first Kelvin wave in a lake was documented in the 1960s 
 – have not detected these wave modes. Understanding these wave modes\, i
 n Lake Geneva and in other \nlakes worldwide\, is crucial because of their
  role in deepwater mixing and sediment-water exchange\, as well as the tra
 nsport and dispersion of sediments\, nutrients\, and pollutants.
LOCATION:MR3\, CMS
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