Quantification of paleotemperature changes during isotopic stage 2 in the La Draga continental sequence (NE Spain) based on the Mg/Ca ratio of freshwater ostracods

• Published in: Quaternary Science Reviews
• Main Author: Wansard, G.
• Other Authors: UCL
• Format: Article in Journal/Newspaper
• Language: English
• Published: Pergamon-elsevier Science Ltd 1996
• Subjects: Draga; North Atlantic
• Online Access: http://hdl.handle.net/2078.1/47114; https://doi.org/10.1016/0277-3791(95)00044-5

Past summer temperature changes are quantified from the La Draga sequence (Banyoles, NE Spain) during Stage 2 (24-10 ka BP), using trace-element content in lacustrine ostracod valves. The high resolution results from this new method are compared to summer paleotemperature reconstructions from sequences from the North Atlantic area, providing a discussion about the magnitudes of some temperature changes. In NE Spain and offshore Portugal, the coldest part of Stage 2 is not documented at the classical date of similar to 18 C-14 ka BP (similar to 21.5 calendar ka BP) but rather occurred later date of ca. 17-15 ka cal. BP In the North Atlantic area, the onset of the Bolling/Allerod interstadials was relatively synchroneous at similar to 14.6 ka cal. BP, although the magnitude of the Bolling/Allerod improvement was more important in the southern area than in the northern area. The duration of the Younger Dryas is discussed. Even if different durations are reported from calendar ages, it seems that the summer temperature cooling of the Younger Dryas was similar around the North Atlantic area. (C) 1996 Elsevier Science Ltd