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Registros recuperados: 12
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A revised calendar age for the last reconnection of the Black Sea to the global ocean ArchiMer
Soulet, Guillaume; Menot, G.; Lericolais, Gilles; Bard, E..
During the last decade, a debate arose regarding the timing and pattern of the last reconnection of the Black Sea "Lake" with the global ocean. On a geochemical basis, the radiocarbon age of Black Sea "Lake" surface water, during the time of reconnection, was determined to be similar to 8400 C-14 a. BP. Despite the potential bias induced by the hard water effect in lakes, the reconnection age was calibrated without any reservoir age correction, which led to an estimate of similar to 9400 cal a. BR Since knowledge for the actual calendar age has important hydrologic implications that would provide new insights regarding the mechanism of reconnection, determining the actual calendar age for the last reconnection remains important. Based upon modeling...
Tipo: Text Palavras-chave: Black sea; Reconnection; Reservoir age; Bosphorus sill.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00038/14909/12351.pdf
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C14 dating of a 50 m core from the Tahiti barrier reef IRD
Bard, E.; Montaggioni, L.; Arnold, M.; Rougerie, Francis.
Tipo: Text Palavras-chave: RECIF BARRIERE; CORAIL; DATATION; C 14; NIVEAU MARIN; VARIABILITE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:42895
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Constraints on the magnitude and patterns of ocean cooling at the Last Glacial Maximum ArchiMer
Waelbroeck, C.; Paul, A.; Kucera, M.; Rosell-mele, A.; Weinelt, M.; Schneider, R.; Mix, A. C.; Abelmann, A.; Armand, L.; Bard, E.; Barker, S.; Barrows, T. T.; Benway, H.; Cacho, I.; Chen, M. T.; Cortijo, E.; Crosta, X.; De Vernal, A.; Dokken, T.; Duprat, J.; Elderfield, H.; Eynaud, F.; Gersonde, R.; Hayes, A.; Henry, M.; Hillaire-marcel, C.; Huang, C. C.; Jansen, E.; Juggins, S.; Kallel, N.; Kiefer, T.; Kienast, M.; Labeyrie, L.; Leclaire, H.; Londeix, L.; Mangin, S.; Matthiessen, J.; Marret, F.; Meland, M.; Morey, A. E.; Mulitza, S.; Pflaumann, U.; Pisias, N. G.; Radi, T.; Rochon, A.; Rohling, E. J.; Sbaffi, L.; Schafer-neth, C.; Solignac, S.; Spero, H.; Tachikawa, K.; Turon, J. -l..
Observation-based reconstructions of sea surface temperature from relatively stable periods in the past, such as the Last Glacial Maximum, represent an important means of constraining climate sensitivity and evaluating model simulations. The first quantitative global reconstruction of sea surface temperatures during the Last Glacial Maximum was developed by the Climate Long-Range Investigation, Mapping and Prediction (CLIMAP) project in the 1970s and 1980s. Since that time, several shortcomings of that earlier effort have become apparent. Here we present an updated synthesis of sea surface temperatures during the Last Glacial Maximum, rigorously defined as the period between 23 and 19 thousand years before present, from the Multiproxy Approach for the...
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Ano: 2009 URL: https://archimer.ifremer.fr/doc/00218/32914/31395.pdf
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Deglacial sea-level record from Tahiti corals and the timing of global meltwater discharge IRD
Bard, E.; Hamelin, B.; Arnold, M.; Montaggioni, L.; Cabioch, Guy; Faure, G.; Rougerie, Francis.
The timing of the last deglaciation is important to our understanding of the dynamics of large ice sheets and their effects on the Earth's surface. Moreover, the disappearance of the glacial ice sheets was responsible for dramatic increases in freshwater fluxes to the oceans, which probably disturbed the ocean's thermohaline circulation and, hence, global climate. Sea-level increase bear witness to the melting of continental ice sheets, but only two such records - from Barbados and New Guinea corals - have been accurately dated. But these corals overlie active subduction zones, where tectonic movements are large and often discontinuous (especially in New Guinea), so the apparent sea-level records may be contamined by a complex tectonic component. Here we...
Tipo: Text Palavras-chave: QUATERNAIRE; RECIF CORALLIEN; NIVEAU MARIN; SEDIMENTOLOGIE; LITHOLOGIE; PALEOENVIRONNEMENT; PALEOCLIMAT.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010006546
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Eastern Mediterranean Sea circulation inferred from the conditions of S1 sapropel deposition ArchiMer
Tachikawa, K.; Vidal, L.; Cornuault, M.; Garcia, M.; Pothin, A.; Sonzogni, C.; Bard, E.; Menot, G.; Revel, M..
Holocene eastern Mediterranean Sea sediments contain an organic-rich sapropel S1 layer that was formed in oxygen-depleted waters. The spatial distribution of this layer revealed that during S1 deposition, deep waters were anoxic below a depth of 1800 m. However, whether this boundary permanently existed from the early to the mid-Holocene has not been examined yet. To answer this question, a multi-proxy approach was applied to a core retrieved close to the 1800 m boundary (at 1780 m). We measured the bulk sediment elemental composition, the stable isotopic composition of the planktonic foraminifer Globigerinoides ruber and the abundance of benthic foraminifera since the last deglaciation. The result indicates that authigenic U and Mo accumulation began...
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00291/40252/38634.pdf
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Glacial hydrologic conditions in the Black Sea reconstructed using geochemical pore water profiles ArchiMer
Soulet, Guillaume; Delaygue, G.; Vallet-coulomb, C.; Boettcher, M. E.; Sonzogni, C.; Lericolais, Gilles; Bard, E..
Chloride and delta O-18 compositions of interstitial water extracted from a long sediment core retrieved from the NW coast of the Black Sea allowed us to constrain the main hydrologic changes of the Back Sea during the Late Pleistocene and Holocene. Prior to its reconnection with the Mediterranean Sea (through the Marmara Sea) at approximately 9000 calendar yr before present (9 ka cal BP), the Black Sea has evolved as a fresh to brackish water lake. At the time of reconnection, hydrologic changes were drastic. Bottom water salinities changed from a few psu (practical salinity unit) to similar to 22 psu. Since solutes in the interstitial water column within sediments are advected and diffused the measured concentrations do not reflect those of past bottom...
Tipo: Text Palavras-chave: Black Sea; Interstitial water; Salinity; Water isotopes; Advection/diffusion modelling; Deglaciation.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12239/9798.pdf
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Hydrology in the Sea of Marmara during the last 23 ka: Implications for timing of Black Sea connections and sapropel deposition ArchiMer
Vidal, L.; Menot, G.; Joly, C.; Bruneton, H.; Rostek, F.; Cagatay, M. N.; Major, C.; Bard, E..
Sediments deposited under lacustrine and marine conditions in the Sea of Marmara hold a Late Quaternary record for water exchange between the Black Sea and the Mediterranean Sea. Here we report a multiproxy data set based on oxygen and strontium isotope results obtained from carbonate shells, major and trace elements, and specific organic biomarker measurements, as well as a micropaleontological study from a (14)C-dated sediment core retrieved from the Sea of Marmara. Pronounced changes occurred in delta(18)O and (87)Sr/(86)Sr values at the fresh and marine water transition, providing additional information in relation to micropaleontological data. Organic biomarker concentrations documented the marine origin of the sapropelic layer while changes in...
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Ano: 2010 URL: https://archimer.ifremer.fr/doc/00231/34243/32642.pdf
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Le carbone 14 : progrès récents et limitations de la méthode de datation IRD
Duplessy, J.C.; Arnold, M.; Bard, E.; Cortijo, E.; Labeyrie, L.; Laj, C.; Lehman, B.; Mazaud, A.; Paterne, M.; Tisnerat, N.; Vidal, L..
La méthode de datation par le carbone 14 a permis l'établissement d'une échelle chronologique du Quaternaire Supérieur et a contribué à la découverte de phénomènes insoupçonnés comme l'existence de variations climatiques abruptes et de grande amplitude pendant la dernière période glaciaire et la déglaciation qui l'a terminée. L'effort continu pour comparer les âges carbone 14 avec les âges calendaires a été maintenant étendu au delà de 30 000 ans, même si le nombre de mesures est encore trop petit pour permettre l'établissement d'une courbe de calibration précise au delà des dix mille dernières années. La comparaison des variations du rapport 14C/12C de l'atmosphère avec celles du champ magnétique terrestre (déduites de l'analyse des carottes de sédiments...
Tipo: Text Palavras-chave: QUATERNAIRE; DATATION ABSOLUE; C 14; GEOCHRONOLOGIE; PALEOCLIMAT; CHAMP MAGNETIQUE.
Ano: 1998 URL: http://www.documentation.ird.fr/hor/fdi:010013863
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Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions ArchiMer
Cartapanis, O.; Tachikawa, K.; Romero, O. E.; Bard, E..
The intensity and/or extent of the northeastern Pacific Oxygen Minimum Zone (OMZ) varied in-phase with the Northern Hemisphere high latitude climate on millennial timescales during the last glacial period, indicating the occurrence of atmospheric and oceanic connections under glacial conditions. While millennial variability was reported for both the Greenland and the northern Atlantic Ocean during the last interglacial period, the climatic connections with the northeastern Pacific OMZ has not yet been observed under warm interglacial conditions. Here we present a new geochemical dataset, spanning the past 120 ka, for major components (terrigenous fraction, marine organic matter, biogenic opal, and carbonates) generated by X-ray fluorescence scanning...
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Ano: 2014 URL: https://archimer.ifremer.fr/doc/00272/38341/36594.pdf
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Reply to Comment on "The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf south of Istanbul" by Hiscott et al., Marine Geology 248, 228-236 ArchiMer
Eris, K. K.; Ryan, W. B. F.; Cagatay, M. N.; Lericolais, Gilles; Sancar, U.; Bard, E.; Menot, G..
In their comment Hiscott and co-authors adhere rigidly to ages and sources for sedimentary units in the subsurface of the Marmara shelf that they have previously reported in their publications from 2002 through 2007. This adherence is in spite of a superior age-depth model from our 13 m-long sediment core that penetrated deeply into the deposits under consideration and in disregard to the results of subsequent more-detailed and full-coverage mapping of the region under scrutiny. The age revisions are dismissed by the authors of the comment as representing sediments severely disturbed during coring. We rebut this criticism. The Bosporus source attributed by them to the sedimentary units sampled and dated by us appears to be driven by their conception that...
Tipo: Text Palavras-chave: Spillway; Black Sea; Marmara Sea; Dardanelles; Bosporus.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-5915.pdf
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Sea level record during the last 14,000 YR obtained by dating corals from Tahiti IRD
Bard, E.; Hamelin, B.; Arnold, M.; Montaggioni, L.; Cabioch, Guy; Laurenti, A.; Faure, G.; Rougerie, Francis.
Tipo: Text Palavras-chave: NIVEAU MARIN; ESTIMATION; SEDIMENTOLOGIE; PALEOENVIRONNEMENT; RECIF CORALLIEN; ANALYSE DE DONNEES.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:42779
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Sea-surface salinity variations in the northern Caribbean Sea across the Mid-Pleistocene Transition ArchiMer
Sepulcre, S.; Vidal, L.; Tachikawa, K.; Rostek, F.; Bard, E..
By reconstructing past hydrologic variations in the Northern Caribbean Sea and their influence on the stability of the Atlantic Meridional Overturning Circulation (AMOC) during the last 940 ka, we seek to document climate changes in this tropical area in response to the Mid-Pleistocene Transition (MPT). Using core MD03-2628, we estimated past changes in sea surface salinity (SSS) using Delta delta O-18, the difference between the modern, and the past delta O-18 of seawater (obtained by combining alkenone thermometer data with the delta O-18 of the planktonic foraminifera Globigerinoides ruber (white) and corrected for ice-sheet volume effects). Today, the lowest SSS values in the area studied are associated with the northernmost location of the...
Tipo: Text
Ano: 2011 URL: https://archimer.ifremer.fr/doc/00228/33887/32232.pdf
Registros recuperados: 12
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