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GEOVIDE, An international GEOTRACES study along the OVIDE section in the North Atlanctic and the Labrador Sea – GEOVIDE
The main objectives of the GEOVIDE project are to (i) better know and quantify the meridional overturning circulation (MOC) and the carbon cycle in a decadal variability context, adding new tracers; (ii) map the Trace Element and Isotope (TEI) distribution with their physical and chemical speciation
Boron isotopes in carbonates as proxy for seawater paleo-pH: back to basics – CARBORIC
see uploaded document see uploaded document see uploaded document see uploaded document A major scientific challenge is to determine the CO2 content of the past atmosphere or associated ocean acidity. The boron isotopic composition of marine carbonates was first proposed as a proxy of ancient seawat
Stratospheric Dynamics and Variability : Understanding and Solutions to persistent model biases – StraDyVariUS
Although the circulation of the stratosphere has rather large spatial scale, climate models still struggle with three of its key features. First, in the Tropics the winds are dominated by zonal winds that circle the globe and reverse roughly every 26 to 28 months: the Quasi-Biennal Oscillation. This
Turbulence and dynamo in planetary cores – TuDy
If we try to build plausible scenarios of the cascade of kinetic and magnetic energies from the measured large-scales down, we see that classical ideas on magnetohydrodynamic turbulence would yield unrealistic estimates of viscous dissipation in the Earth’s core. We think that the resolution of t
Timing and processes of tsunamigenic debris avalanche emplacement in the Lesser Antilles Volcanic Arc: insights from offshore drilling (Expedition IODP 340) and implication for hazard assessment. – CARIB
CARIB project is conceived to take advantage of the unprecedented dataset (9 drilling cores and logging data) that have been obtained in Expedition IODP (Integrated Ocean Drilling Program) 340 (R/V JOIDES Resolution, March-April 2012). A complete record of eruptive activity and volcanoclastic sedime
Redox state of deep Earth through its history – OxyDeep
Oxygen is the key element that regulates the Earth (and other planets) dynamics because it allows for abundant elements (Fe, Si, S, H) to change valence and therefore their distribution between the Earth’s major reservoirs (core, mantle, crust, hydrosphere). The role of iron is major since it can ch
BIOlogical and photochemical impacts on cloud oxidant CAPacity – BIOCAP
The main issues and objectives are the following: 1) to describe in detail the unexplored aspects of cloud water composition, 2) to assess •OH photochemical production and 3) to describe the biochemical mechanisms leading to the production or the degradation of oxidant species in cloud aqueous phas
Holocene North-Atlantic Gyres and Mediterranean Overturning dynamic through Climate Changes – HAMOC
The salinity and heat balance of the North Atlantic region is of paramount importance for the Northern Hemisphere climate and is intimately tied to the northward transport of heat and salt through the gyre and intergyre circulations and the Atlantic Meridional Overturning Circulation (AMOC), as reve
Chemistry of Organic biradicals: GeNesis of AtmospheriC aerosols – COGNAC
In the troposphere, the understanding of the chemistry of aerosols and radicals species involved is the key to a better understanding of the future developments in our changing environment, in relation to climate change and air quality. However, a number of indicators show that our knowledge of the
Insight into the Precambrian oceans from a biogeochemical study of a present-day analog: the lake Dzinai Dzaha, Mayotte. – Dziani
The overarching objective of Dziani project is to better interpret ancient sedimentary rocks in order to characterize ancient oceans. Looking at modern systems chosen for their possible analogies with anciant oceans is one way to do this. The lake chosen for this study is the Lake Dziani Dzaha, loca
OceaniC Chaos - ImPacts, strUcture, predicTability – OCCIPUT
A substantial low-frequency (1-10 years) chaotic variability spontaneously emerges in turbulent ocean simulations. In regions that are key for climate, this intrinsic «noise« dominates the variability that is directly forced by the atmosphere. OCCIPUT aims to jointly study these two components of th
Seismic coupling and megaquakes along the Himalayan arc – BHUTANEPAL
To assess the question of lateral variations in seismic coupling along the Himalayan arc, we focus the present project on two major axes: the geometry of crustal structures and the distribution of stress over seismic cycles. We aim at improving our understanding of the following topics: Temporal va
On the Regulation of Carbonic anhydrase Activity and the COS and CO18O fluxes in terrestrial ecosystems – ORCA
In terrestrial ecosystems, dissolved CO2 in leaf and soil water pools rapidly goes into oxygen isotopic equilibrium with water [CO2+H218O H2O+CO18O]. In leaves, where the enzyme carbonic anhydrase (CA) is present and abundant, this isotopic equilibrium is reached almost instantaneously. As a conseq
Probing Deep and Surface Processes in Central Tibet – DSP-Tibet
How and when the Tibetan plateau developed has long been a puzzling question with implications for the current understanding of the behavior of the continental lithosphere in convergent zones. The Central Tibetan plateau provides the ideal existing laboratory to understand the evolution of a large