Planktonic foraminiferal (Globigerinoides ruber) Mg/Ca ratios and SSTs of sediment cores GeoB9501-4 and GeoB9501-5 ...

• Main Authors: Kuhnert, Henning, Mulitza, Stefan
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2011
• Subjects: MultiCorer; Gravity corer Kiel type; M65/1; Meteor 1986; Center for Marine Environmental Sciences MARUM; Integrierte Analyse zwischeneiszeitlicher Klimadynamik INTERDYNAMIK; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.773758; https://doi.pangaea.de/10.1594/PANGAEA.773758

Multidecadal variations in Atlantic sea surface temperatures (SST) influence the climate of the Northern Hemisphere. However, prior to the instrumental time period, information on multidecadal climate variability becomes limited, and there is a particular scarcity of sufficiently resolved SST reconstructions. Here, we present an eastern tropical North Atlantic reconstruction of SSTs based on foraminiferal (Globigerinoides ruber pink) Mg/Ca ratios that resolves multidecadal variability over the past 1700 years. Spectral power in the multidecadal band (50 to 70 years period) is significant over several time intervals suggesting that the Atlantic Multidecadal Oscillation (AMO) has been influencing local SST. Since our data exhibit high scatter the absence of multidecadal variability in the remaining record does not exclude the possibility that SST variations on this time scale might have been present without being detected in our data. Cooling by ~0.5 °C takes place between about AD 1250 and AD 1500; while this ... : For the age model see also: doi:10.1594/PANGAEA.742939 ...