A 4500-year reconstruction of sea surface temperature variability at decadal time-scales off North Iceland

作者：Sicre Marie Alexandrine; Yiou Pascal; Eiriksson Jon; Ezat Ullah; Guimbaut Elwrick; Dahhaoui Imane; Knudsen Karen Luise; Jansen Eystein; Turon Jean Louis

来源：Quaternary Science Reviews, 2008, 27(21-22): 2041-2047.

DOI：10.1016/j.quascirev.2008.08.009

Marine paleo-records; acquired at high temporal resolution provide critical data for testing numerical climate models and help to understand processes underlying ocean variability. This study presents a unique 4500-year reconstruction of sea surface temperature (SST) obtained from alkenones in the North Atlantic Polar Front area off North Iceland, at an average temporal resolution of 4-5 years. Spectral analysis of this signal shows dominant multidecadal oscillations which occurred with a stronger amplitude between 2500 and 4200 years BP, hand in hand with fluctuations of bottom currents indicated by paleomagnetic proxies. Contemporaneous large excursions of the Inter-tropical Convergence Zone (ITCZ) are also recorded by the distant Cariaco titanium time series, suggesting a link with low latitude Atlantic climate. We speculate that the oscillations reflect changes of the Meridional Overturning Circulation (MOC) induced by increased ENSO activity.

• 出版日期2008-11
• 单位中国地震局