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SUMMARY:EESS talk "Methane formation\, pathways and emissions in Lake Sopp
 en: A case study in paleolimnology\, ecology and eutrophication"
DTSTART:20161122T121500
DTEND:20161122T131500
DTSTAMP:20260416T113349Z
UID:780d5233f20191eeac0c18f88416fb48a216bcf78b333e5dfbab3a33
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Daniel McGinnis\, Assistant Professor\, Aquatic Physics Gro
 up\, University of Geneva\, CH\nAbstract: Methane from freshwaters contrib
 utes ~20% to the total global atmospheric methane emissions (excluding wet
 lands)\, with about half attributed to bubble release (ebullition). Methan
 e is an important greenhouse gas\, whose global warming potential is 28 ti
 mes greater than carbon dioxide. With positive correlations to temperature
  and eutrophication\, ebullition rates from lakes are expected to be exace
 rbated with a warming climate and increased nutrient loading. Little work\
 , however\, has been performed on the effect on methane formation and tran
 sport on lake ecology and carbon turnover\, and the eutrophication-methane
  feedback mechanisms. We report a study of methane formation\, transport a
 nd emissions on Lake Soppen – a small\, glacially-formed lake located in
  Canton Lucerne (Switzerland). Extensively studied in the last decades\, L
 ake Soppen has experienced increasing eutrophication in the past centuries
 . Using current monitoring results\, combined with published paleolimnolog
 ical indicators and system analysis\, we report present methane production
  rates\, pathways and emissions\, as well as an estimation of the beginnin
 g of methane ebullition in the lake’s history. Linked with a historical 
 increase in sedimentation rates\, the beginning of methane bubble emission
  and associated eutrophication is likely responsible for a dramatic shift 
 in the lake benthic fauna populations\, with consequences to the trophic c
 arbon transport. We hypothesize that the time when sediment methane bubble
  release begins represents a significant tipping point in lake trophic sta
 tus\, and in Lake Soppen is likely linked to significant land use changes 
 in the small (1.6 km2)\, largely agricultural watershed. Finally\, in this
  case study\, we quantify the methane transport mechanisms and fate in Lak
 e Soppen\, with an emphasis on refining the carbon balance\, turnover\, an
 d estimating basin-wide CO2 and methane emissions.\n\nShort biography: Dan
 iel McGinnis completed his PhD in Civil and Environmental Engineering at V
 irginia Tech in 2003. There\, he focused on lake and reservoir management\
 , with an emphasis on artificial (hypolimnetic) aeration as a lake managem
 ent technique. Afterwards\, he spent nearly 5 years in the Aquatic Physics
  group at Eawag (Kastanianbaum) as a postdoc studying turbulence\, oxygen 
 and methane transport in lakes and the ocean\, followed by positions at GE
 OMAR (Kiel\, DE)\, University of Southern Denmark (Odensee\, DK) and IGB (
 Berlin\, DE) studying physics\, oxygen and carbon turnover in lakes\, coas
 tal oceans and the artic. In September\, 2014\, Daniel was awarded an assi
 stant professor position and started the Aquatic Physics group at Universi
 ty of Geneva\, Institute F.-A. Forel.
LOCATION:GR A3 31 http://plan.epfl.ch/?room=GR%20A3%2031
STATUS:CONFIRMED
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