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Welcome to the Marine Environmental Chemistry (CEM) Group collection

The Marine Environment Chemistry (CEM) team focuses on several environmental issues:

  1. Characterization and quantification of organic and inorganic elements in the marine environment,
  2. Estimation of their flow from the continent to the oceans and their monitoring by optical means,
  3. Definition of their sources and fate in the water column,
  4. effect of sedimentary diagenesis on anthropogenic inputs.

These themes are a component of the general problem of understanding the cycles of elements and the effect of the anthropization of environments, which are crucial phenomena in the context of global climate change.


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Latest submissions in HAL !

[hal-02053059] Cross-slope variations of organic carbon and bacteria in the Gulf of Lions in relation to water dynamics (northwestern Mediterranean)

During November 1994,seawater samples were collected in the Gulf of Lions in the north- western Mediterranean Sea. Four stations were chosen to cover a range of environments, from coastal seawater near Marseille, France, to open ocean waters 30 miles off the coast. Samples were studied for dissolved and particulate organic carbon (DOC and POC) as well as bacterial abundance and chloro- phyll a (chl a) In the water column, DOC comprized 93 to 99% of total organic carbon, ranged from 65 to 118pM and was lower in deep waters on the slope. Considering an average 82 ~.IMDOC concen- tration measured In the surface layer (0 to 70 m) of the slope as typical of the core of the northwestern Mediterranean current, we estimated the DOC load carried by the current to range from 82 to 164 X to3 mol C S-', which was ca 100 times higher than the Rhone River input for the same period. Chl a con- centrations were up to 224 ng I-' whereas bacterial concentrations ranged from 0.9 to 7.7 X 10' cells ml-' making up 17 to 24% of the POC in the surface layer (0 to 70 m). Bacterial-C/phytoplankton-C ratios around the slope were higher than offshore and were in good agreement with bacterial production/ prlmary product~onratios. These results indicate a time lag between autotrophic phytoplanktonic and heterotroph~cbacterial activities and/or differences in the food web structure from the slope to the seaward end of the section. Although the bacterial-C/phytoplankton-C ratios were lower at the coastal station, the lowest primary production as well as higher bacterial production/primary production ratios were calculated in this area. This suggests that a part of bacterial production was sustained by terres- trial organic matter on the shelf Variations among stations sampled during comparable climatological conditions revealed the existence of a spatial gradient across the slope.

[hal-03014052] Grassland-cropland rotation cycles in crop-livestock farming systems regulate priming effect potential in soils through modulation of microbial communities, composition of soil organic matter and abiotic soil properties






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