Faits marquants 2018

Mars 2018

09 mars 2018 Antarctic climate variability on regional and continental scales over the last 2000 years Climate trends in the Antarctic region remain poorly characterized, owing to the brevity and scarcity of direct climate observations and the large magnitude of interannual to decadal-scale climate variability. Here, within the framework of the PAGES Antarctica2k working group, we ... Lire la suite »	09 mars 2018 EastGRIP firn air field campaign Air enclosed in ice cores provides a unique archive for paleo-climate studies. Understanding the air enclosure process is essential for better quantifying the age of air trapped in the bubbles, correct for artifacts in elemental and isotopic composition of trapped species and estimate the ... Lire la suite »
08 mars 2018 Vertical distribution of helium and 40Ar/36Ar in porewaters of the Eastern Paris Basin (Bure/Haute Marne): constraints on transport processes through the sedimentary sequence As part of its ongoing project on repositories for high-activity, long-lived radioactive waste, a 2000 m deep borehole was drilled by the French Nuclear Waste Agency (ANDRA) in the layered structure of alternating aquifers and aquitards of the Eastern Paris Basin. Among the information retrieved ... Lire la suite »	06 mars 2018 Tritium and radiocarbon levels in the Rhône river delta and along the French Mediterranean coastline The Rhône is characterised by a heavy concentration of nuclear-based industries including nuclear power stations and nuclear sites housing civilian and military facilities. Here, we report the results of a four-year survey (2010-2013) of tritium and radiocarbon levels in a variety of matrices ... Lire la suite »
06 mars 2018 Underground residence time and mixing of the main mineral waters of Tunisia : a multi-tracer study Bottled waters are increasingly popular in Tunisia. Most of them come from groundwaters, thus raising the question of the long-term availability of the mineral groundwater resources. Water collected from production springs or wells of eleven mineral waters of Tunisia among the main commercial ... Lire la suite »	$Carbon, nitrogen and oxygen isotope fractionation during food cooking: implications for the interpretation of the fossil human record$ 05 mars 2018 Carbon, nitrogen and oxygen isotope fractionation during food cooking: implications for the interpretation of the fossil human record Objectives: Stable isotope data provide insight into the reconstruction of ancient human diet. However, cooking may alter the original stable isotope compositions of food due to losses and modifications of biochemical and water components. Methods: To address this issue, carbon, nitrogen and ... Lire la suite »

Février 2018

26 février 2018

The transient distributions of nuclear weapon-generated tritium and its decay product 3He in the Mediterranean Sea, 1952 – 2011, and their oceanographic potential

We present a comprehensive account of tritium and 3He in the Mediterranean Sea since the appearance of the tritium generated by the atmospheric nuclear-weapon testing in the 1950s and early 1960s, based on essentially all available observations. Tritium in surface waters rose to 20 - 30 TU in 1964 ... Lire la suite »