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Introduction
Paleoclimatology (Quaternary, Interglacials, Ocean; Little Ice Age), Climate change (mountains, surface changes, adaptation)
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Publications (32)
The Last Interglacial (LIG or Marine Isotopic Substage 5.5, MIS5.5), which is comprised between ≈129 and ≈116 thousand
years Before Present (hereafter ky BP), is poorly documented, especially in continental areas, owing to the scarcity of deposits
attributable to this period, which corresponds to the Eemian in the chronostratigraphy of northwestern...
In the context of climate change, authorities must take actions for adapting to local impacts. However, one can notice that they have difficulties doing so. In this study, we aim at identifying the obstacles to action, or on the contrary, what can be levers for adaptation. We investigated mid altitude mountains at mid latitudes in the French Alps (...
The hard and soft tissue remains of a pre-Hispanic population of the Gran Canaria Island at six different archaeological localities were studied using 14C dating and stable isotope compositions. Radiocarbon dating indicates island occupation ranging from the beginning of the 7th to the mid-14th century. We analyzed the oxygen isotope compositions o...
Training, an adaptation lever in the face of climate change for mid-mountain areas. Report for the European fonds for the regional development, ARTACLIM program : adaptation and resilience of alpine territories in the face of climate change.
The Canary Islands, east of the North Atlantic Ocean (27°N-29°N), are under the influence of the Canary Current, the descending branch of the North Atlantic Gyre, which is modulated by coastal upwelling off North-West Africa. They constitute strategic sites for palaeoclimatic reconstructions, especially for the Last Interglacial (LIG, 129 to 116 ky...
Faire comprendre le réchauffement climatique, ses enjeux et ses solutions, telle est l'ambition de cette nouvelle édition du livre Climats. Passé, présent, futur. En s'appuyant sur les évolutions du climat sur la Terre par le passé, Marie-Antoinette Mélières et Chloé Maréchal donnent des clefs pour mieux appréhender les changements actuels. Ces deu...
The study of paleoclimates enables us to improve and better constrain climate models in order to forecast future climate variations. Marine Isotope Stage 11 (MIS11), which began around 425,000 yr BP and lasted about 65,000 yr, is a warm isotope stage of paramount importance, because the astronomical configuration was similar to the one characterizi...
This book is designed for first- and second-year university students (and their instructors) in earth science, environmental science, and physical geography degree programmes worldwide. The summaries at the end of each section constitute essential reading for policymakers and planners, and provide a simple but masterly account, with a minimum of eq...
Comprendre les climats passés pour appréhender le changement climatique en cours : telle est
l’originalité de ce livre ambitieux. Le texte est une synthèse à jour des principales connaissances
sur l’évolution actuelle du climat et des enjeux qui se dessinent. Pour cela, il présente tout d’abord
les mécanismes à l’œuvre dans le maintien du climat (P...
Since the mid of the 90's, multi-Collector Inductively-Coupled-Plasma
Mass Spectrometry (MC-ICP-MS) offers the possibility of measuring the
relative proportions of isotopes for a broad range of environmentally
relevant elements labelled as ''non traditional isotopes'' (Cr, Fe, Ni,
Cu, Zn, Se, Hg,...). These recent analytical possibilities have alre...
Zinc isotopes have been studied along two smelter-impacted soil profiles sampled near one of the largest Pb and Zn processing plants in Europe located in northern France, about 50km south of Lille. Mean δ66Zn values along these two soil profiles range from +0.22±0.17‰ (2σ) to +0.34±0.17‰ (2σ) at the lowest horizons and from +0.38±0.45‰ (2σ) to +0.7...
Zinc (Zn) isotopic fractionation during adsorption onto a humic acid (HA), an analogue of organic matter (OM), has been investigated experimentally for the first time as a function of pH. The Donnan Membrane device (DM) is used to separate Zn bound to a Purified Humic Acid (PHA) from free Zn2+ ions in solution. This device has been successfully ada...
Zinc isotopic fractionation during adsorption onto a purified humic acid (PHA), an analogue of organic matter (OM), has been investigated experimentally as a function of pH. The Donnan Membrane device (DM) was used to separate Zn bound to the PHA from free Zn2+ ions in solution and allowed us to measure the isotopic ratios of free Zn2+. Below pH 6,...
Zn isotopic fractionation caused by sorption on 2-Lines ferrihydrite (Fh2L) and goethite was investigated to assess the role of reactions at the Fe-oxyhydroxide/water interface in changes of the isotopic distribution of Zn. Since sorption reactions are ubiquitous in Earth’s surface environments, it is important to evaluate their influence on the is...
The boron geochemical cycle has been simulated using a time-dependent geochemical box model that was coupled to a one-dimension model of seawater–oceanic crust interactions. Boron elemental and isotopic compositions of oceanic rocks as a function of depth were calculated by mass balance, using the temperature and porosity profiles of the crust as w...
Whether transition element isotopes can be fractionated at equilibrium in nature is still uncertain. Standard solutions of Cu and Zn were eluted on an anion-exchange resin, and the isotopic compositions of Cu (with respect to Zn) of the eluted fractions were measured by multiple-collector inductively coupled plasma mass spectrometry. It was found t...
The Zn isotopic compositions of ferromanganese nodules, sediment trap samples, sediments, and organic reference samples have been analyzed by multiple collector inductively coupled plasma-mass spectrometry (ICP-MS). The range of isotopic variations (10/00 for 66Zn/64Zn) is significant with respect to the analytical precision (0.040/00 at the 95% co...
The stable isotope geochemistry of Cu and Zn is poorly known because of the lack of a suitable analytical technique. We present a procedure for the analysis of Cu and Zn isotope compositions by plasma-source mass spectrometry (Plasma 54) together with a method to purify Cu and Zn from natural samples of silicates, ores, and biological material. A p...
