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Zarriess, Michelle; Mackensen, Andreas (2011): Stable isotope ratios of epibenthic foraminifer Cibicidoides wuellerstorfi from sediment profile GeoB9526 [dataset]. PANGAEA,, Supplement to: Zarriess, M; Mackensen, A (2011): Testing the impact of seasonal phytodetritus deposition on [delta]13C of epibenthic foraminifer Cibicidoides wuellerstorfi: A 31,000 year high-resolution record from the northwest African continental slope. Paleoceanography, 26, PA2202,

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Studies of temporal changes of ocean circulation and deep-water ventilation often rely on d13C records of epibenthic foraminifer Cibicidoides wuellerstorfi. However, primary productivity related overprints may distort the signal and simulate a chemical age of ambient water mass that is too old and simulates poorly ventilated ambient bottom waters. To further constrain the use of C. wuellerstorfi d13C records from high-productivity areas, we analyzed a 14CAMS-dated gravity core from the upwelling regime off northwest Africa at 12°N. We compare this new record with 37 radiocarbon dated d13C records from the eastern Atlantic Ocean between 45°N and 25°S that are bathed by the same water mass. Only during Heinrich events 1 and 2, when the investigated core site off northwest Africa experienced year-round, sustained deposition of organic matter, the d13C values at this site faithfully record deep-water ventilation states. During times of predominantly seasonal deposition of fresh phytodetritus, however, d13C values were significantly lower than at the reference sites. This underscores that reconstruction of paleocirculation and deep ocean ventilation using C. wuellerstorfi d13C from regions that experienced seasonal phytodetritus deposition needs to be validated by additional proxies that are not affected by local productivity.
Related to:
Zarriess, Michelle (2010): Primary Productivity and Ocean Circulation Changes on orbital and millennial Timescales off Northwest Africa during the Last Glacial/Interglacial Cycle: Evidence from benthic foraminiferal Assemblages, stable carbon and oxygen isotopes and Mg/Ca Paleothermometry [dissertation]. Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, 129 pp, urn:nbn:de:gbv:46-00101842-13
Median Latitude: 12.435167 * Median Longitude: -18.056417 * South-bound Latitude: 12.435000 * West-bound Longitude: -18.056667 * North-bound Latitude: 12.435333 * East-bound Longitude: -18.056167
Date/Time Start: 2005-06-21T01:00:00 * Date/Time End: 2005-06-22T03:28:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 3.50 m
GeoB9526-4 (311) * Latitude: 12.435333 * Longitude: -18.056167 * Date/Time: 2005-06-21T01:00:00 * Elevation: -3223.0 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 44-49 cm
GeoB9526-5 (311) * Latitude: 12.435000 * Longitude: -18.056667 * Date/Time: 2005-06-22T03:28:00 * Elevation: -3223.0 m * Recovery: 10.84 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 1084 cm, liner broken inside tube, potential sediment loss between 9-10-11 m.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2DEPTH, sediment/rockDepth sedmGeocode
3Depth, compositeDepth compmcdMackensen, Andreas
4AGEAgeka BPGeocode
5Cibicidoides wuellerstorfi, δ18OC. wuellerstorfi δ18O‰ PDBMackensen, AndreasMass spectrometer Finnigan MAT 251
6Cibicidoides wuellerstorfi, δ13CC. wuellerstorfi δ13C‰ PDBMackensen, AndreasMass spectrometer Finnigan MAT 251
210 data points

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