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SUMMARY:Special EESS Seminar talk on "The forgotten piece of lake's carbon
  cycle"
DTSTART:20251212T144500
DTEND:20251212T154500
DTSTAMP:20260923T171155Z
UID:407d926cb00c6ed7e39b84a370bfebc2555a4728ab861ec01c317072
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Marie-Élodie Perga\, UNIL\nAbstract:\n\n\nIn this talk\
 , Prof. Perga will explain why lakes and other inland waters are significa
 nt CO₂ emitters and why the underlying mechanisms remain debated. For de
 cades\, the metabolic theory\, which attributes lake carbon cycling primar
 ily to the balance between inorganic carbon fixation by primary production
  and release through respiration\, has dominated our understanding. Howeve
 r\, this paradigm fails to explain CO₂ emissions in many lakes\, as well
  as the magnitude and long-term changes observed over the last 150 years. 
 Increasing evidence shows that lake CO₂ excess can also result from inor
 ganic carbon inputs from catchments\, yet the role of these inputs remains
  underappreciated. A key gap lies in understanding how processes affecting
  total alkalinity (TAC) and dissolved inorganic carbon (DIC) regulate CO
 ₂ fluxes at the lake-atmosphere interface. Drawing on paleo-ecological r
 ecords\, long-term observatories\, high-frequency monitoring\, and remote 
 sensing\, Prof. Perga and her team combined these observations in a physic
 al-biogeochemical model to show how alkalinity inherited from catchment we
 athering can sustain the net positive CO₂ emissions of Lake Geneva. They
  further demonstrated that calcite precipitation\, a process long overlook
 ed\, significantly boosts annual CO₂ outgassing\, not only in Lake Genev
 a but across a variety of lakes worldwide\, including some of the largest 
 on Earth.\n \n\n\n\n\n\nBiography:\n\n\n\nProf. Marie-Élodie Perga is a 
 Full Professor at the University of Lausanne. Her research focuses on the 
 biogeochemistry and ecology of alpine lakes\, as well as their responses t
 o environmental change. Throughout her career\, she has developed integrat
 ed approaches to unravel long-term lake trajectories. She is also a key sc
 ientific contributor to the LéXPLORE platform on Lake Geneva\, a floating
  laboratory that enables continuous\, high-resolution monitoring of lake p
 rocesses and supports many of the recent advances in understanding carbon 
 cycling in large lakes. In addition\, she contributes to broader discussio
 ns on the sustainability and structural evolution of the research process 
 itself.\n\n
LOCATION:ALP 1 109 https://plan.epfl.ch/?room=%3DALP%201%20109&dim_floor=9
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 /epfl.zoom.us/j/65616044153?pwd=j5BEpXEHO5v6Cab67dOdGgC5eXVuBb.1
STATUS:CONFIRMED
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