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Stalagmite record from speleothems of the Peqiin Cave, Northern Israel over the past 250 ka
CTR :346
Key words stalagmite; arid region in central Asia; Israel; Soreq Cave; Peqiin Cave; over the past 250ka; westerly area; winter precipitation
Relevant data Bar-Matthews, M., A. Ayalon, M. Gilmour, A. Matthews, and C.J. Hawkesworth, 2003,Sea-land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals, Geochimica et Cosmochimica Acta, 67, 17, pp. 3181-3199, 1 September 2003. From:http://www.ncdc.noaa.gov
Data shows that
The oxygen and carbon stable isotope compositions of cave speleothems provide a powerful method for understanding continental climate change. Here, we examine the question of the regionality of this isotopic record and its linkage with the marine isotopic record in the Eastern Mediterranean (EM) region. The study presents a new, accurately dated 250-kyr d18O and d13C record determined from speleothems of the Peqiin Cave, Northern Israel. Its comparison with the continuous 185-kyr isotopic record of the Soreq Cave speleothems from Central Israel reveals striking similarities. Thus, a strong regional climatic signal, brought about by variations in temperature and rainfall amount, is reflected in both cave records. Low d18O minima in the Peqiin profile for the last 250- to 185-kyr period (interglacial marine isotopic stage 7) match the timing of sapropels 9 to 7 and are indicative of high rainfall in the EM region at these times. The combined Soreq and Peqiin d18O record for the last 250 kyr excellently matches the published Globigerinoides ruber (G. ruber) marine d18O record for the EM Sea, with the isotopic compositional difference G.ruber-speleothems remaining relatively constant at -5.6 +/- 0.7 per mil, thus establishing for the first time a robust, exploitable link between the land and the marine isotopic records. The correspondence of low d18O speleothem values and high cave water stands with low G. ruber d18O values during interglacial sapropel events indicates that these periods were characterized by enhanced rainfall in the EM land and sea regions. By use of sea surface temperatures derived from alkenone data as a proxy for land temperatures at the Soreq Cave, we calculate the paleorainfall d18O values and its amounts. Maximum rainfall and lowest temperature conditions occurred at the beginning of the sapropel events and were followed by decrease in rainfall and increase in temperatures, leading to arid conditions. The record for the last 7000 yr shows a trend toward increasing aridity and agrees well with climatic and archeological data from North Africa and the Middle East. DESCRIPTION: Oxygen and carbon stable isotope data from 2 cave speleothems in central Israel.Soreq Cave: 31.45N, 35.03E, Judean Mountains, surface elevation 400m, cave depth 10-50m below surface.Peqiin Cave: 32.58N, 35.19E, Upper Galilee Mountains, surface elevation 650m,cave depth 10-30m below surface.
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