EESS talk on "Dissolved organic matter (DOM) composition: recent advances on its molecular and isotopic characterization"
Event details
| Date | 12.11.2019 |
| Hour | 12:15 › 13:00 |
| Speaker |
Dr Christos Panagiotopoulos,Institut Méditerranéen d'Océanologie, Aix-Marseille University (AMU), Marseille (FR) - obtained his Ph. D degree in Chemical Oceanography in Aix Marseille University at 2002 followed by a first post-doc in Woods Hole Oceanographic Institution (WHOI scholarship; 2003-2005) and a second in Univ. of California (Irvine, fellowship 2005-2006). Since 2006 his holds a researcher CNRS position at the Mediterranean Institute of Oceanography (MIO; https://www.mio.osupytheas.fr). C. Panagiotopoulos is currently head scientist of the chemistry team of MIO (2017- ) and the chemistry facility at the MIO. Research Interests: -Molecular characterization of dissolved organic matter (DOM) using 1H, 13C,15N NMR, MS, and HPLC techniques. -Radiocarbon of natural compounds (monosaccharides and amino acids) isolated from DOM. -Carbohydrate and amino acid geochemistry. -Organic matter production degradation by bacteria in water column. DOM/POM transformations and distribution in marine waters -Terrestrial organic matter fluxes in the surface sea and the water column -DOM monitoring using surface enhanced Raman spectroscopy (SERS). -Distribution and fluxes of organic contaminants in coastal areas (phthalates, BPA, flame retardants, and pesticides) -Chemical composition and fluxes of organic compounds (dicarboxylic acids and burning biomass tracers) of atmospheric aerosols into the sea. |
| Location | |
| Category | Conferences - Seminars |
Abstract:
Containing as much carbon as the atmosphere, marine dissolved organic matter (DOM) at 662 Pg 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 substrate to vast heterotrophic microbial population being an important source of C, N, P and is mostly produced autochthonously by photosynthetic plankton in the upper ocean. Despite its large inventory DOM exists in extremely low concentrations (surface/deep: 34-80 µMC), exhibits an old radiocarbon signature (surface/deep: 3000-6000 yr) while only 5-10% is chemically characterized indicating that the fate, the composition and overall the dynamics of DOM are poorly understood. In this talk I will first review previous knowledge gained over the last 3 decades on DOM composition emphasizing in sampling approaches, NMR, mass spectrometry techniques and bulk/molecular level radiocarbon analyses. Then, I will present some of the major achievements on DOM research including data obtained in my lab over the last five years and I will end up by ongoing research and future directions.
Containing as much carbon as the atmosphere, marine dissolved organic matter (DOM) at 662 Pg 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 substrate to vast heterotrophic microbial population being an important source of C, N, P and is mostly produced autochthonously by photosynthetic plankton in the upper ocean. Despite its large inventory DOM exists in extremely low concentrations (surface/deep: 34-80 µMC), exhibits an old radiocarbon signature (surface/deep: 3000-6000 yr) while only 5-10% is chemically characterized indicating that the fate, the composition and overall the dynamics of DOM are poorly understood. In this talk I will first review previous knowledge gained over the last 3 decades on DOM composition emphasizing in sampling approaches, NMR, mass spectrometry techniques and bulk/molecular level radiocarbon analyses. Then, I will present some of the major achievements on DOM research including data obtained in my lab over the last five years and I will end up by ongoing research and future directions.
Practical information
- General public
- Free
- This event is internal
Organizer
- EESS - IIE
Contact
- Prof. Athanasios Nenes, LAPI