10.1594/PANGAEA.757318
Eglinton, Geoffrey
Geoffrey
Eglinton
Bradshaw, S
S
Bradshaw
Resell, A
A
Resell
Sarnthein, Michael
Michael
Sarnthein
Pflaumann, Uwe
Uwe
Pflaumann
Tiedemann, Ralf
Ralf
Tiedemann
0000-0001-7211-8049
Sedimentation rate and UK37 on Site 108-658
PANGAEA
1992
DEPTH, sediment/rock
AGE
Sedimentation rate
Alkenone, unsaturation index UK37
Composite Core
Leg108
Joides Resolution
Ocean Drilling Program (ODP)
1986-03-04T00:00:00/1986-03-08T00:00:00
en
Supplementary Dataset
10.1038/356423a0
1148 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
High-resolution palaeoclimate records based on oxygen isotope data have provided important insights into climate variability and rates of natural climate change on about a thousand-year timescale. Little is known, however, about the variation of climate and of palaeoceanographic conditions throughout the Quaternary on timescales of less than 1,000 years (at frequencies far greater than those of the Milankovitch orbital cycles). Here we show that such high time resolution is possible from molecular stratigraphic studies based on 'biomarker' organic molecules (alkenones). We have sampled alkenone stratigraphic records at 70- to 200-yr intervals across glacial terminations I, II and IV in sediment cores from OOP site 658, off northwest Africa. Sea surface temperatures (SSTs) derived from the alkenone (Uk 37) index vary rapidly beyond the range of analytical noise by up to 2.5 °C in 300 yr, showing hitherto unknown cycles with about 600-yr periodicities. Some of the changes parallel similar events in the oxygen isotope stratigraphy. SST oscillations may be linked, in part, to abrupt breakdowns in Atlantic deep-water ventilation resulting from meltwater events of Quaternary glacial terminations.
Depth is given as m.c.d. (meter composite depth).
Supplement to: Eglinton, Geoffrey; Bradshaw, S; Resell, A; Sarnthein, Michael; Pflaumann, Uwe; Tiedemann, Ralf (1992): Molecular record of secular sea surface temperature changes on 100-year timescales for glacial terminations I, II and IV. Nature, 356(6368), 423-426
-18.5808
20.7492
Canarias Sea