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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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| Theodorou, Aj. |
| The development of the concept of a "neutral surface" - an isopycnal surface refined by the introduction of a variable reference pressure - is presented. Problems in approximating such a surface (concerning, for example and inter alia, the reference water parcel to be used in starting a neutral surface; or the reference pressure and parcel to be used and path to be followed in extending a neutral surface from station to station) are examined. These problems arise because oceanographic reality only provides data at discrete depths from given station networks. The effects of compressibility dependence on the thermohaline properties of a water parcel in delineating a neutral surface are also considered. A new method of approximating neutral surfaces is... |
| Tipo: Text |
Palavras-chave: NEUTRAL SURFACE; OCEANIC CIRCULATION; HYDROLOGICAL DATA; ATLANTIC OCEAN; MEDITERRANEAN SEA. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21251/18864.pdf |
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