Cel To build, for modellers and other climate researchers, a highquality data base describing the detailed changes in the NorthAtlantic surface and deep water properties and circulation overthe last 250.000 years. A special emphasis is given on theinterglacials and the inception of the glaciations. To integratethe results in a global climatic framework, specially withrespect to the thermohaline circulation, the extent of sea ice,evolution of the major ice sheets and the global carbon cycle.The study will involve the construction of records of veryhigh-resolution (about 100--300 years) from high quality sedimentcores representative of the main areas and water masses of theNorth Atlantic Ocean, Norwegian Sea, and the Southern Ocean.Analyzed proxies will cover the changes in foraminiferal, diatom,and dyno-flagellate species distribution, oxygen and carbonisotopic ratio in planktic and benthic foraminifera, organic andinorganic traces geochemistry, organic and mineral carboncontent, colour reflectance and magnetic susceptibility of thesediments. Deconvolution of the effect of the bioturbationalmixing, will permit an ultimate resolution of 100 to 400 years.Sea surface temperature will be estimated using the fossil faunaspecific distribution and the bio-marker Uk37, and salinity willbe derived from the foraminifera delta 18O, after correctionfor theeffect of temperature on isotopic fractionation. The data willallow the estimation of density differences between surface anddeep waters, and thus constrain the changes in verticalthermohaline structure between interglacial and glacial periods,and during the rapid climatic transitions.Additional cores will be studied at lower resolution (approximately 1-2 kyrs)to map the spatial distribution of the same parameters, withwater depth and along North-South and East-West transects throughthe North Atlantic Ocean, at specific time intervals during thesame period, to prepare simulations with Ocean GeneralCirculation Models.Isotopic stage 3 (the period between 40 and 20 kyrs BP) will beused as special target, as it is accessible to 14C dating.Rapid interactions between the dynamics of ice sheets and oceanthermohaline circulation have been evidenced during that period.These interactions will be studies in detail using specifictracers of the ice input (ice rafted detritus) in cores locatedat proximity of the main ice sheets. Dziedzina nauki natural sciencesearth and related environmental sciencesgeochemistryengineering and technologymaterials engineeringcolorsnatural sciencesearth and related environmental sciencesphysical geographyglaciology Program(-y) FP3-ENV 1C - Specific research and technological development programme (EEC) in the field of the environment, 1990-1994 Temat(-y) 0101 - Natural climate change Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator Centre National de la Recherche Scientifique (CNRS) Wkład UE Brak danych Adres Avenue de la Terrasse 91198 Gif-sur-Yvette Francja Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (5) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Christian-Albrechts Universität Kiel Niemcy Wkład UE Brak danych Adres Olshausenstraße 40 24118 Kiel Zobacz na mapie Koszt całkowity Brak danych UNIVERSITE DE BORDEAUX I Francja Wkład UE Brak danych Adres Avenue des Facultés 33405 TALENCE Zobacz na mapie Koszt całkowity Brak danych UNIVERSITY OF BERGEN Norwegia Wkład UE Brak danych Adres 41,Allégaten 41 5007 BERGEN Zobacz na mapie Koszt całkowity Brak danych UNIVERSITY OF BRISTOL Zjednoczone Królestwo Wkład UE Brak danych Adres Cantock's Close BS8 1TS BRISTOL Zobacz na mapie Koszt całkowity Brak danych University of Cambridge Zjednoczone Królestwo Wkład UE Brak danych Adres Trinity Lane CB2 1TS Cambridge Zobacz na mapie Koszt całkowity Brak danych