The Mediterranean sediments (ODP Hole 967): memory of the last interglacial stage.

Details The Mediterranean sediments (ODP Hole 967): memory of the last interglacial stage. The Mediterranean sediments (ODP Hole 967): memory of the last interglacial stage.

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5980b&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5980

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Many studies have shown that the alternation between carbonated levels (nanofossil ooze) and rich organic matter levels (sapropels) in the oriental Mediterranean Sea is driven for the Plio-quaternary by the climatic variations resulting from the astronomical forcings (e.g. Emeis and Sakamoto, 1998). The high resolution digitalisation of the colour photos of the ODP Leg 160 sedimentary cores, and the extraction (using image processing software) of the 3 fundamental colour components RGB allow to obtain high resolution continuous signals. This leads to a resolution more resolving (˜500 times) than the one resulting from the arctic and antarctic ice core sampling. The strong correlations between the obtained signals and the variations of the δO18 isotopic composition of sea water allow to establish a precise age model. After the time-tuning of the sedimentary column, the succession of climatic events, with periods lower than the precession one (˜23 ka), can be explored. About twenty climatic events, which induced significant variations of the sediment composition, can then be observed during the last interglacial period (100 to 128 kyr). For example, the temperature high, responsible of the Heinrich 11 event during the isotopic stage 5e (Eemien) in the atlantic ocean, is clearly registered in the oriental Mediterranean sea by a 4-cm-thick marl layer. The sapropel stage S5 is found during the following cooling stage. The sapropel development is stopped by a cold event, quite short (˜500 years), well-known in the occidental Mediterranean sea (Sanchez-Goñi et al., 2000) and also visible on the Greenland δO18 data. On the contrary, this event does not appear on the Vostok data, which seems to have been filtered for the high frequencies and to be slightly out of phase (˜5 kyr). The strong correlation between the Mediterranean and the Greenland signals should also be pointed out. References: Emeis K.C, and Sakamoto T. (Eds), 1998. The sapropel theme of Leg 160. Proc. ODP, Sci. Results, 160: College Station, TX (Ocean Drilling Program). Sanchez-Goñi M.F., Turon J.L., Shackleton N.J. and Cayre O., 2000. Direct land/sea correlation of the Eemian, and its comparison with the Holocece : a high-resolution palynological record off the Iberian margin. Netherland Eur. J., 79. 345--354.

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