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SUMMARY:EESS talk on "Dissolved organic matter (DOM) composition: recent a
 dvances on its molecular and isotopic characterization"
DTSTART:20191112T121500
DTEND:20191112T130000
DTSTAMP:20260512T015116Z
UID:60bfc3fefcd0018657be2a3b5d19fd8f4d40074949e4b6bb761a479d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Christos Panagiotopoulos\,Institut Méditerranéen d'Océan
 ologie\, Aix-Marseille University (AMU)\, Marseille (FR) - obtained his Ph
 . D degree in Chemical Oceanography in Aix Marseille University at 2002 fo
 llowed by a first post-doc  in Woods Hole Oceanographic Institution (WHOI
  scholarship\; 2003-2005) and a second in Univ. of California (Irvine\, fe
 llowship 2005-2006). Since 2006 his holds a researcher CNRS position at th
 e Mediterranean Institute of Oceanography (MIO\; https://www.mio.osupythea
 s.fr). C. Panagiotopoulos is currently head scientist of the chemistry tea
 m of MIO (2017- ) and the chemistry facility at the MIO. Research Interest
 s:\n-Molecular characterization of dissolved organic matter (DOM) using 1H
 \, 13C\,15N NMR\, MS\, and HPLC techniques.\n-Radiocarbon of natural compo
 unds (monosaccharides and amino acids) isolated from DOM.\n-Carbohydrate a
 nd amino acid geochemistry.\n-Organic matter production degradation by bac
 teria in water column. DOM/POM transformations and distribution in marine 
 waters\n-Terrestrial organic matter fluxes in the surface sea and the wate
 r column\n-DOM monitoring using surface enhanced Raman spectroscopy (SERS)
 .\n-Distribution and fluxes of organic contaminants in coastal areas (phth
 alates\, BPA\, flame retardants\, and pesticides)\n-Chemical composition a
 nd fluxes of organic compounds (dicarboxylic acids and burning biomass tra
 cers) of atmospheric aerosols into the sea.\nAbstract:\nContaining as much
  carbon as the atmosphere\, marine dissolved organic matter (DOM) at 662 P
 g C is one of Earth’s major carbon reservoirs\, holding greater than 200
  times the carbon inventory of marine biomass. Marine DOM serves as a subs
 trate to vast heterotrophic microbial population being an important source
  of C\, N\, P and is mostly produced autochthonously by photosynthetic pla
 nkton in the upper ocean. Despite its large inventory DOM exists in extrem
 ely low concentrations (surface/deep: 34-80 µMC)\, exhibits an old radioc
 arbon signature (surface/deep: 3000-6000 yr) while only 5-10% is chemicall
 y characterized indicating that the fate\, the composition and overall the
  dynamics of DOM are poorly understood. In this talk I will first review p
 revious knowledge gained over the last 3 decades on DOM composition emphas
 izing in sampling approaches\, NMR\, mass spectrometry techniques and bulk
 /molecular level radiocarbon analyses. Then\, I will present some of the m
 ajor achievements on DOM research including data obtained in my lab over t
 he last five years and I will end up by ongoing research and future direct
 ions.
LOCATION:GR C0 01 https://plan.epfl.ch/?room==GR%20C0%2001
STATUS:CONFIRMED
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