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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:Hydropower reservoirs as methane sources 
DTSTART:20100301T161500
DTSTAMP:20260414T032131Z
UID:011de293831fc4e65dfd1efc6d10fb80f755623010313a9e49ec118c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Wehrli\, Bernhard (EAWAG)\nThere is growing interest and conce
 rn about methane emissions from reservoirs globally. However\, the methane
  fluxes from reservoirs reported in the literature are very discordant - r
 anging over an order of magnitude - with tropical ones considered the most
  important.   Organic-rich sediments in lakes and reservoirs are hot spots
  of methanogenesis\, from which methane can escape to the atmosphere via f
 our major pathways - bubbling\, diffusion\, transport through plants\, and
  exposure of the anoxic methane-rich deep waters to the atmosphere during 
 convective mixing events. We have conducted a detailed systems analysis on
  the Wohlensee reservoir of the Aare River in Switzerland. Measurements us
 ing gas traps indicated very high ebullition rates. Methane diffusion from
  the sediment was generally low and seasonally stable and could not fully 
 account for methane accumulation during passage through the reservoir. A f
 irm relationship between water temperature and the observed dissolved meth
 ane accumulation allowed us to identify and quantify the role of bubble di
 ssolution. The reservoir emitted methane at an average rate of ~150 mg met
 hane per square meter and day (130 tons per year)\, which is the highest e
 ver recorded for a mid-latitude reservoir. These and further results indic
 ate that temperate water bodies can be an important but overlooked methane
  source in a warming climate. 
LOCATION:GR B3 30
STATUS:CONFIRMED
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