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| Duplessy, Jc; Labeyrie, L; Juilletleclerc, A; Maitre, F; Duprat, J; Sarnthein, M. |
| We have developed a new method to reconstruct surface water salinity of the North Atlantic Ocean, based on a comparison between transfer function estimates of sea surface temperature and the oxygen isotope ratio of two common planktonic foraminiferal species, N. pachyderma (left coiling) and G. bulloides. We first used core-top analyses to demonstrate that, under modern conditions, the paleotemperatures determined from the isotopic composition of foraminiferal shells are linearly linked to the summer sea surface temperature only within a certain temperature range, characteristic of each species, which is termed the "optimum temperature range". We then used this information to derive an estimate of the isotopic composition and salinity of the North Atlantic... |
| Tipo: Text |
Palavras-chave: PALEO-OCEANOGRAPHY; PALEOCLIMATOLOGY; ISOTOPES; SALINITY; ATLANTIC OCEAN. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21261/18872.pdf |
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| Labeyrie, L D; Kallel, N; Arnold, M; Juillet-leclerc, A; Maitre, F; Duplessy, J-c; Shackleton, N-j. |
| The understanding of the processes involved in large climatic changes as the last glacial/interglacial cycle asks for detailed descriptions of the changes which occurred during the last deglaciation, the only transition which may be dated accurately. In that matter, the super(14)C Accelerator Mass Spectrometry (AMS) allows unprecedented sensitivity on the dating of the foraminifera which are used for isotopic analysis. The partial differential super(13)C of the benthic foraminifera is a good indicator of the changes in bottom water ventilation. We present here a comparison of the changes in the oxygen and carbon isotopic records of benthic and planktonic foraminifera in 2 cores from the north west slope of the Pacific Ocean, along the Japan continental... |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37945/36026.pdf |
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