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SUMMARY:EESS talk on "Hydrodynamic control of biogeochemical cycling in st
 reams"
DTSTART:20180522T121500
DTEND:20180522T131500
DTSTAMP:20260506T205417Z
UID:7062d5220e201ddb8cedb746a676aaa959ccabb3e24fa76c114c4204
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Andreas Lorke\, professor\, Environmental Physics\, Institu
 te for Environmental Sciences\, University of Koblenz-Landau\, Germany\nAb
 stract:\nLow-order streams form the most abundant and the largest componen
 t of fluvial networks. They transport and process particulate and dissolve
 d substances of terrestrial or anthropogenic origin. For example\, they ca
 n be strong sources of the atmospheric greenhouse gases CO2\, CH4 and N2O\
 , or they convert anthropogenic nitrate loads into N2. The type and magnit
 ude of biogeochemical cycling in streams\, as well its spatial and tempora
 l variability are ubiquitously linked to flow velocity and turbulence. Alt
 hough stream flow has been modified globally by human activities\, the pro
 cesses by which flow and turbulence regulate biogeochemical cycles are poo
 rly understood. Here I report results from recent research activities in t
 hat field\, including experimental studies on methane production and gas b
 ubble formation in stream sediments\, linkages between flow diversity and 
 biodiversity of epilithic biofilms and the effect of turbulence on gas exc
 hange with the atmosphere.\n\nShort biography:\nAndreas Lorke studied phys
 ics and obtained a PhD in 1998. After working as postdoc at several instit
 utions in Germany and in Switzerland\, he became appointed a professor for
  environmental physics at the University of Koblenz Landau in 2008. His re
 search focus is on environmental fluid mechanics and physical limnology. H
 is group investigates how fluid flow is generated\, how it interacts with 
 organisms\, transports material and affects biogeochemical transformations
  in aquatic ecosystems.
LOCATION:GR A3 32 https://plan.epfl.ch/?room==GR%20A3%2032
STATUS:CONFIRMED
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