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SUMMARY:EESS talk on "Impact on organic carbon mobilization and greenhouse
  gas emissions"
DTSTART:20251104T121500
DTEND:20251104T131500
DTSTAMP:20260922T190122Z
UID:8cd2062cfef929b95099a60ee4a3c174b506dc03860b3e1d1f5087ba
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr. Andreas Kappler\, University of Tuebingen\nAbstract
 :\nPermafrost peatlands hold enormous amounts of organic carbon\, equivale
 nt to over one-third of the carbon currently in the atmosphere (∼800 Pg)
 . Up to 20% of the total organic carbon is bound to reactive iron (Fe) min
 erals in the active layer overlying intact permafrost\, potentially protec
 ting the organic carbon from microbial degradation and transformation into
  greenhouse gases (GHG) such as CO2 and CH4. In this project we use geoch
 emical data and microbial community analyses from field samples (from a pe
 rmafrost peatland in Abisko\, Sweden) and laboratory microcosm incubations
  to determine how mineral iron stability and microbial processes influence
  mineral dissolution during permafrost thaw\, including the implications f
 or carbon cycling and GHG emissions. Furthermore\, we evaluate the role of
  anaerobic methane oxidation (coupled to the reduction of Fe(III) minerals
  and redox-active natural organic matter) for greenhouse gas emissions.\n\
 n\n\nBiography:\nAfter studying chemistry\, Andreas Kappler did a PhD in E
 nvironmental Microbiology (University of Konstanz\, Germany) and two postd
 ocs\, one in Environmental Chemistry (EAWAG/ETH Zürich\, Switzerland) and
  one in Geomicrobiology (Caltech\, Pasadena\, USA). Since 2004 he is the h
 ead of the Geomicrobiology group at University of Tübingen (Germany).\nHi
 s research interests are interactions between microbes and minerals and th
 e consequences for pollutants\, nutrients and greenhouse gases in environm
 ental systems including soils and sediments. In particular\, the Tübingen
  Geomicrobiology Group is interested in the mechanisms and the thermodynam
 ics of microbial reduction and oxidation of iron minerals and redox-active
  natural organic matter and the consequences of these transformations for 
 the fate of greenhouse gases (N2O\, CH4\, CO2)\, toxic metall(oid)s such a
 s arsenic\, cadmium and chromium and nutrients (such as phosphate and ammo
 nium). They are also studying biomineralization and the potential role of 
 phototrophic Fe(II)-oxidizing and Fe(III)-reducing bacteria as well as cya
 nobacteria in the deposition of ancient rocks (e.g. Banded Iron Formations
 ).\n\n\n\n 
LOCATION:ALP 1 107 https://plan.epfl.ch/?room==ALP%201%20107 https://epfl.
 zoom.us/j/69011077410
STATUS:CONFIRMED
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