nom_organisme nom_organisme nom_organisme nom_organisme
drapeau

Faits marquants 2017

Mars 2017

Modeling of hydrogen production by serpentinization in ultramafic-hosted hydrothermal systems: application to the Rainbow field
28 mars 2017
The production of hydrogen by serpentinization in ultramafic-hosted hydrothermal systems is simulated by coupling thermodynamic and dynamic modeling in the framework of a thermo-hydraulic single-pass model where a high-temperature hydrothermal fluid moves preferentially through a main canal of high ... Lire la suite »
Linking environmental changes with human occupations between900 and 400 ka in Western Europe
28 mars 2017
 Human occupation in Europe strongly fluctuated over the Quaternary. Archaeological records suggest an intermittent human occupation in Western Europe between 900 and 500 ka, especially in the north of Europe at latitude higher than 45°N. On the opposite, southern Europe, more stable from ... Lire la suite »
Stable oxygen isotope evidence for mobility in mediaeval and post-mediaeval Trondheim, Norway
28 mars 2017
Immigration and mobility in the mediaeval and post-mediaeval periods in Norway has, up until now, mainly been discussed on the basis of historical sources. This paper presents the results of stable oxygen isotope (d18O) analyses of the 1st and 3rd molars from 95 individuals from mediaeval and ... Lire la suite »
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters
28 mars 2017
Used alone, the isotopic compositions of O and H in ice give insights into the variations of the local temperature, whereas taken together they can provide information on the climatic conditions at the point of origin of the moisture. Recent analyses of snow from shallow pits indicate that the ... Lire la suite »
Oxygen isotope fractionation between bird eggshell calcite and body water: application to fossil eggs from Lanzarote (Canary Islands)
27 mars 2017
  Oxygen and carbon isotope compositions of fossil bird eggshell calcite (δ18Ocalc and δ13Ccalc) are regularly used to reconstruct paleoenvironmental conditions. The δ18Ocalc values mainly reflect the oxygen isotope composition of the waters ingested by birds (δ18Ow), ... Lire la suite »
Improvement of isotope-based climate reconstructions in Patagonia through a better understanding of climate influences on isotopic fractionation in tree rings
27 mars 2017
This study is the first presenting annually resolved chronologies of both δ18O and δ13C in Nothofagus pumilio and Fitzroya cupressoides trees from Northern Patagonia. Interannual variability in δ18O and δ13C was assessed over the period 1952-2011. Based on these ... Lire la suite »
 French summer droughts since 1326 CE: a reconstruction based on tree ring cellulose δ18O
24 mars 2017
This article presents a reconstruction of summer droughts in France based on annually resolved, absolutely dated chronologies of oxygen isotope ratios (δ18O) in tree ring cellulose from Quercus spp. Samples were taken from living trees and timber wood from historic buildings at two sites: ... Lire la suite »
A multi-proxy approach to drought reconstruction
24 mars 2017
In palaeoclimate reconstructions, the combination of proxy records measured in different climate archives is challenging because of the uncertainties associated with each proxy, but it can also help reduce some of these uncertainties. Here, we present a novel approach to combine speleothem and ... Lire la suite »
Reconstruction du climat et de l’environnement des derniers 800 000 ans a partir des carottes de glace – variabilité orbitale et millénaire.
24 mars 2017
  Au cours des 40 dernières années, la recherche sur les carottes de glace a produit des résultats de référence pour l’évolution de la température polaire et de la composition atmosphérique au cours des 800 000 dernières ... Lire la suite »
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
24 mars 2017
  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 ... Lire la suite »
The chronology of human and animal presence in the decorated and sepulchral cave of Cussac (France)
23 mars 2017
  In this article, we present a first synthesis of the chronology of Cussac Cave (Dordogne, SW France). This deep cavern (1.6 km), discovered in 2000, is very well preserved (e.g. intact floors) and thus favorable to research, especially given its rare association of parietal art and ... Lire la suite »
Early Neanderthal constructions deep in Bruniquel Cave in southwestern France
23 mars 2017
  Very little is known about Neanderthal cultures, particularly early ones. Other than lithic implements and exceptional bone tools, very few artefacts have been preserved. While those that do remain include red and black pigments and burial sites, these indications of modernity are ... Lire la suite »
An interactive tool for navigation within a database of water and carbon stable isotope records from natural archives.
16 mars 2017
Past climate is an important benchmark to assess the ability of climate models to simulate key processes and feedback. Model–data comparisons can help to constrain the uncertainties associated with transfer functions. We have put together a global database of proxy records of oxygen (d18O), ... Lire la suite »
Vers une Physique Statistique des  Événements Extrêmes Climatiques
15 mars 2017
Pour l’instant, l’application de la théorie des valeurs extrêmes était limitée aux systèmes qui décrivent la dynamique d’un point dans le temps. Ce cadre est utile pour étudier des phénomènes physiques localisés ... Lire la suite »
Interglacials of the last 800,000 years
14 mars 2017
Interglacials, including the present (Holocene) period, are warm, low land ice extent (high sea level), end-members of glacial cycles. Based on a sea level definition, we identify eleven interglacials in the last 800,000 years. Data compilations suggest that despite spatial heterogeneity, Marine ... Lire la suite »
Evaluation of the warm marine air intrusion at the French Antarctic station Dumont d’Urville using water stable isotopes as an atmospheric tracer
07 mars 2017
During the austral summer 2016-17, an infrared spectrometer monitoring water stable isotopes in the vapour has been deployed by Camille Bréant from LSCE (Laboratoire des Sciences du Climat et de l’Environnement, Paris, France) at the coastal station of Dumont d’Urville in East ... Lire la suite »

Février 2017

Linking environmental changes with human occupations between 900 and 400 ka in Western Europe
02 février 2017
  Human occupation in Europe strongly fluctuated over the Quaternary. Archaeological records suggest an intermittent human occupation in Western Europe between 900 and 500 ka, especially in the north of Europe at latitude higher than 45°N. On the opposite, southern Europe, more stable ... Lire la suite »
Extreme storms during the last 6500 years from lagoonal sedimentary archives in the Mar Menor (SE Spain)
02 février 2017
Storms and tsunamis, which may seriously endanger  human  society,  are  amongst  the  most  devastating  marine catastrophes that can occur in coastal areas. Many such events are known  and have been reported  for the Mediterranean, a region where ... Lire la suite »
Early Neanderthal constructions deep in Bruniquel Cave in southwestern France
02 février 2017
  Very little is known about Neanderthal cultures1, particularly early ones. Other than lithic implements and exceptional bone tools2, very few artefacts have been preserved. While those that do remain include red and black pigments3 and burial sites4, these indications of modernity are ... Lire la suite »
 

Janvier 2017

 Palaeotemperature reconstruction during the Last Glacial from d18O of earthworm calcite granules from Nussloch loess sequence, Germany
26 janvier 2017
The Nussloch loess–palaeosol sequence (Rhine Valley, Germany) is considered to be one of the most complete records of the last glacial period in Western Europe due to its very high sedimentation rate and its good chronological control. This sequence is therefore a good framework in which to ... Lire la suite »
Fossil redox-conditions influence organic matter composition in loess paleosols
26 janvier 2017
  Abstract The soil memory recorded in paleosols of loess-paleosol sequences is an important contributor to our understanding of past climatic conditions. Molecular proxies based on the organic matter preserved in paleosols form an essential part of this record, but the long-term ... Lire la suite »
Quantification of vertical solid matter transfers in soils during pedogenesis by a multi-tracer approach
26 janvier 2017
PURPOSE Vertical transfer of solid matter in soils (bioturbation and translocation) is responsible for changes in soil properties over time through the redistribution of most of the soil constituents with depth. Such transfers are, however, still poorly quantified. MATERIALS AND METHODS In this ... Lire la suite »
Labelled microbial culture as a calibration medium for 13C-isotope measurement of derivatized compounds: application to tert-butyldimethylsilyl amino acids
26 janvier 2017
  RATIONALE: Compound-specific stable carbon isotope analysis by GC/C/IRMS is widely used in studies of environmental or biological functioning. In the case of derivatized molecules, a calibration might be required due to added non-analyte carbon and in some cases non-stoichiometric ... Lire la suite »
Late Pleistocene climate evolution in Southeastern Europe recorded by soil bacterial membrane lipids in Serbian loess
26 janvier 2017
Loess–paleosol sequences in the Vojvodina region in the southeastern Carpathian Basin have been intensively studied to obtain a high-resolution stratigraphical framework for the Upper Pleistocene in this part of Europe. In these studies, millennial-scale sedimentation variations in the Upper ... Lire la suite »
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
26 janvier 2017
  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 ... Lire la suite »
Continuous measurements of isotopic composition of water vapour on the East Antarctic Plateau
16 janvier 2017
  Water stable isotopes in central Antarctic ice cores are critical to quantify past temperature changes. Accurate temperature reconstructions require to understand the processes controlling surface snow isotopic composition. Isotopic fractionation processes occurring in the atmosphere and ... Lire la suite »
Reconstruction du climat et de l’environnement des derniers 800 000 ans a partir des carottes de glace – variabilité orbitale et millénaire.
13 janvier 2017
  Abstract: Au cours des 40 dernières années, la recherche sur les carottes de glace a produit des résultats de référence pour l’évolution de la température polaire et de la composition atmosphérique au cours des 800 000 ... Lire la suite »
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores
12 janvier 2017
Abstract: Orbital tuning is central for ice core chronologies beyond annual layer counting, available back to 60 ka (i.e. thousands of years before 1950) for Greenland ice cores. While several complementary orbital tuning tools have recently been developed using δ18Oatm, δO2⁄N2 ... Lire la suite »
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters
12 janvier 2017
  Abstract: The isotopic compositions of oxygen and hydrogen in ice cores are invaluable tools for the reconstruction of past climate variations. Used alone, they give insights into the variations of the local temperature, whereas taken together they can provide information on the climatic ... Lire la suite »
Retour en haut