- La Terrasse, Rhône-Alpes, France
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Research Interests:
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Research Interests: Carbon Dioxide, Carbon, Science, Stable Isotopes, Paleoclimate, and 33 moreMultidisciplinary, Pleistocene, Planktonic Foraminifera, Quaternary, Mediterranean Sea, Atmosphere, Reservoir, Holocene, North Atlantic, Atlantic Ocean, Radiocarbon Dating, Greenland, Calibration, Animals, Plankton, Dating, Ocean Circulation, Temperature, Thermohaline Circulation, Surface Water, Cenozoic, Volcanic eruptions, Seawater, Last Glacial Maximum, Reservoirs, Phanerozoic, Ice, Deglaciation, Time Factors, Fresh water, C, Geologic Sediments, and Cold climate
We present simulated records of past changes in the atmospheric Δ 14 C for the last 50 kyr due to changes in geomagnetic field intensity and in the strength of the North Atlantic Deep Water (NADW). A new geomagnetic record was used,... more
We present simulated records of past changes in the atmospheric Δ 14 C for the last 50 kyr due to changes in geomagnetic field intensity and in the strength of the North Atlantic Deep Water (NADW). A new geomagnetic record was used, largely based on the NAPIS-75 record ...
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Research Interests:
Research Interests:
Research Interests:
To determine the mechanisms governing the last deglaciation and the sequence of events that lead to deglaciation, it is important to obtain a temporal framework that applies to both continental and marine climate records. Radiocarbon... more
To determine the mechanisms governing the last deglaciation and the sequence of events that lead to deglaciation, it is important to obtain a temporal framework that applies to both continental and marine climate records. Radiocarbon dating has been widely used to derive calendar dates for marine sediments, but it rests on the assumption that the `apparent age' of surface water (the age of surface water relative to the atmosphere) has remained constant over time. Here we present new evidence for variation in the apparent age of surface water (or reservoir age) in the North Atlantic ocean north of 40°N over the past 20,000 years. In two cores we found apparent surface-water ages to be larger than those of today by 1,230 +/- 600 and 1,940 +/- 750 years at the end of the Heinrich 1 surge event (15,000 years BP) and by 820 +/- 430 to 1,010 +/- 340 years at the end of the Younger Dryas cold episode. During the warm Bølling-Allerød period, between these two periods of large reservoir ages, apparent surface-water ages were comparable to present values. Our results allow us to reconcile the chronologies from ice cores and the North Atlantic marine records over the entire deglaciation period. Moreover, the data imply that marine carbon dates from the North Atlantic north of 40°N will need to be corrected for these highly variable effects.
Research Interests: Pharmacology, Biochemistry, Bioinformatics, Evolutionary Biology, Genetics, and 48 moreMarine Biology, Neuroscience, Environmental Science, Geophysics, Physics, Materials Science, Quantum Physics, Developmental Biology, Immunology, Climate Change, Molecular Biology, Structural Biology, Genomics, RNA, Computational Biology, Transcriptomics, Biotechnology, Systems Biology, Cancer, Biology, Metabolomics, Cell Cycle, Proteomics, Ecology, Drug Discovery, Evolution, Nanotechnology, Astrophysics, Neurobiology, Medicine, Multidisciplinary, Palaeobiology, Functional Genomics, North Atlantic Ocean, Nature, Signal Transduction, Astronomy, DNA, North Atlantic, Radiocarbon Dating, Cell Signalling, Medical Research, Surface Water, Younger Dryas, Ice Cores, Net Present Value, Marine Sediment, and Earth Science
New records of past sea surface temperatures (SSTs) were derived in the 30–50 kyr B.P. time interval from a core located at 45°S in the Southern Indian Ocean, MD94-103. To investigate the climatic phasing between the Southern Indian... more
New records of past sea surface temperatures (SSTs) were derived in the 30–50 kyr B.P. time interval from a core located at 45°S in the Southern Indian Ocean, MD94-103. To investigate the climatic phasing between the Southern Indian Ocean, the Greenland and the Antarctic ice, the magnetic signal of core MD94-103 was synchronized at better than millennial accuracy in the
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Changes in benthic foraminifera δ18O and δ13C have been followed over the last deglaciation period in seven sediment cores from different water depths in the North Atlantic, Indian and Pacific Ocean. The two periods of most rapid δ18O... more
Changes in benthic foraminifera δ18O and δ13C have been followed over the last deglaciation period in seven sediment cores from different water depths in the North Atlantic, Indian and Pacific Ocean. The two periods of most rapid δ18O changes, at about 17 and 12 ka, are recorded in all intermediate water cores simultaneously with the penetration of brines formed along