Solution-Sediment Chemical Interactions

International audienc

Sur la présence de chlore « gazeux » d'origine marine dans l'atmosphère

International audienc

Discussion de la Question II : Mécanismes d’évolution du littoral

Chesselet Roger, Migniot Claude, Ehny France. Discussion de la Question II : Mécanismes d’évolution du littoral. In: L'hydraulique et la maitrise du littoral. Problèmes côtiers posés par le mouvement des sédiments et la pollution. Dix-huitièmes journées de l'hydraulique. Marseille, 11-13 septembre 1984. Tome 6, 1984

Pathways of manganese in an open estuarine system

International audienc

Mise en évidence dans l'atmosphère marine d'aérosols enrichis en potassium et calcium ayant la surface de la mer pour origine.

International audienc

Sur la distribution d'aérosols d'origine marine dans la basse troposphère.

International audienc

Density of the major size groups of benthic fauna and trophic input in deep basins of the Atlantic Ocean

International audienc

Variations in Ionic Ratios between Reference Sea Water and Marine Aerosols

International audienceAtmospheric particles were collected over the open sea (western Mediterranean, North Atlantic, and Norwegian Sea) by air filtration and cascade impactor sampling. The observed K/Na concentration ratios exhibited marked variation and were greater than the reference ratio in bulk sea water. These concentration ratios can be related to the existence of

Long-range transport of continentally-derived particulate carbon in the marine atmosphere: evidence from stable carbon isotope studies

International audienceSince 1979, we have investigated marine and non-marine sources of particulate carbon in the marine atmosphere from measurements of carbon concentration and isotopic composition 2C). Aerosol samples were collected, mostly during the Sea/Air Exchange (SEAREX) Program experiments, in the northern and southern hemispheres (Sargasso Sea, Enewetak Atoll, Peru upwelling, American Samoa, New Zealand, Amsterdam Island). The concentration and the isotopic composition of particulate carbon of marine origin are about the same in both hemispheres

Extra-terrestrial 53Mn in Antarctic ice

The reasons why 53Mn (a cosmogenic radionuclide with a half-life of 3.7 × 106 y) appears as one of the best indicators of the presence of interplanetary dust are summarized. This paper reports the detection of 53Mn in pre-1952 snow samples collected on the Eastern Antarctic Plateau in the vicinity of Plateau Station. The measurements were carried out by neutron activation and X-ray spectrometry on three samples weighing a few hundred kg and covering each the time interval 1935-1950. The specific activity of 53Mn was found to be (0.82 ± 0.17) disint.min-1/103 tons of snow, corresponding to a deposition rate at Plateau Station of (2.2 ± 0.5) × 10-5 disint. min-1 m-2 y-1. The mean global deposition rate would be three times higher if 53Mn were assumed to behave in the same way as stratospheric 90Sr. By comparing this figure with existing data on the meteorite flux reaching the earth and with the galactic and solar production rates of 53Mn, it is concluded that the bulk of the 53Mn found at Plateau Station is associated with interplanetary dust in which it had been produced by the action of solar protons on iron. The deposition rate of extra-terrestrial dust-borne iron must be between 1.3 × 10-5 and 1.3 × 10-4 g m-2 y-1 at Plateau Station. These results support jointly with other studies the concept of an interplanetary zodiacal cloud of dust with a chemical composition and density not essentially different from chondritic meteorites, with a relatively 'flat' grain size distribution and a mass influx to the earth of the order of 105 tons/y. © 1974.SCOPUS: ar.jinfo:eu-repo/semantics/publishe