Kuhnert, Henning; Mulitza, Stefan (2011): Planktonic foraminiferal (Globigerinoides ruber) Mg/Ca ratios and SSTs of sediment cores GeoB9501-4 and GeoB9501-5 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.773758
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Abstract:
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 corresponds to the inception of the Little Ice Age (LIA), the end of the LIA is not reflected in our record and SST remains relatively low. This transition to cooler SSTs parallels the previously reconstructed shift in the North Atlantic Oscillation towards a low pre-20th century mean state and possibly reflects common solar forcing.
Related to:
Kuhnert, Henning; Mulitza, Stefan (2011): Multidecadal variability and late medieval cooling of near-coastal sea surface temperatures in the eastern tropical North Atlantic. Paleoceanography, 26, PA4224, https://doi.org/10.1029/2011PA002130
Project(s):
Integrierte Analyse zwischeneiszeitlicher Klimadynamik (INTERDYNAMIK)
Funding:
German Research Foundation (DFG), grant/award no. 25575884: Integrierte Analyse zwischeneiszeitlicher Klimadynamik
Coverage:
Median Latitude: 16.840160 * Median Longitude: -16.732745 * South-bound Latitude: 16.839660 * West-bound Longitude: -16.732830 * North-bound Latitude: 16.840660 * East-bound Longitude: -16.732660
Date/Time Start: 2005-06-12T20:01:00 * Date/Time End: 2005-06-12T21:10:00
Event(s):
GeoB9501-4 (286) * Latitude: 16.839660 * Longitude: -16.732660 * Date/Time: 2005-06-12T20:01:00 * Elevation: -330.0 m * Location: Mauritania Canyon * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 45-47 cm
GeoB9501-5 (286) * Latitude: 16.840660 * Longitude: -16.732830 * Date/Time: 2005-06-12T21:10:00 * Elevation: -323.0 m * Recovery: 5.32 m * Location: Mauritania Canyon * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 532 cm
Comment:
For the age model see also: doi:10.1594/PANGAEA.742939
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Kuhnert, H; Mulitza, S (2011): Mg/Ca ratios from Globigerinoides ruber (pink) for the size fractions 200 - 400 µm and >400 µm, and the mean, and SST derived from Mg/Ca ratios of sediment core GeoB9501-4. https://doi.org/10.1594/PANGAEA.773752
- Kuhnert, H; Mulitza, S (2011): Planktonic foraminiferal (Globigerinoides ruber) Mg/Ca ratios and estimated SSTs from gravity core GeoB9501-5. https://doi.org/10.1594/PANGAEA.773754