Planktonic foraminifera fluxes and stable isotope ratios in the Irminger Sea ...

• Main Authors: Jonkers, Lukas, van Heuven, Steven, Zahn, Rainer, Peeters, Frank J C
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Event label; Sample code/label; DATE/TIME; Date/time end; DEPTH, water; Neogloboquadrina pachyderma sinistral, flux; Neogloboquadrina pachyderma sinistral, δ18O; Neogloboquadrina pachyderma sinistral, δ13C; Globigerina bulloides, flux; Globigerina bulloides, δ18O; Globigerina bulloides, δ13C; Turborotalita quinqueloba, flux; Turborotalita quinqueloba, δ18O; Turborotalita quinqueloba, δ13C; Trap, sediment; Calculated; Mass spectrometer, Finnigan, MAT 253; Irminger Sea; Neogloboquadrina pachyderma; North Atlantic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.807458; https://doi.pangaea.de/10.1594/PANGAEA.807458

Past water column stratification can be assessed through comparison of the d18O of different planktonic foraminiferal species. The underlying assumption is that different species form their shells simultaneously, but at different depths in the water column. We evaluate this assumption using a sediment trap time-series of Neogloboquadrina pachyderma (s) and Globigerina bulloides from the NW North Atlantic. We determined fluxes, d18O and d13C of shells from two size fractions to assess size-related effects on shell chemistry and to better constrain the underlying causes of isotopic differences between foraminifera in deep-sea sediments. Our data indicate that in the subpolar North Atlantic differences in the seasonality of the shell flux, and not in depth habitat or test size, determine the interspecies Delta d18O. N. pachyderma (s) preferentially forms from early spring to late summer, whereas the flux ofG. bulloides peaks later in the season and is sustained until autumn. Likewise, seasonality influences ... : Stable isotope data for small N. pachyderma (s) in samples IRM-1 06-07, 09-10 and 12-13 are average values from both collecting cups. ...