Shell flux and oxygen isotope data of North Atlantic foraminifera ...

• Main Authors: Jonkers, Lukas, Brummer, Geert-Jan A, Peeters, Frank J C, van Aken, Hendrik M, de Jong, M Femke
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: Event label; DATE/TIME; Date/time end; Flux of total mass; Silicon, flux; Carbon, organic, flux; Nitrogen, total, flux; Calcium carbonate, flux; Neogloboquadrina pachyderma sinistral, flux; Turborotalita quinqueloba, flux; Foraminifera, planktic, other, flux; Neogloboquadrina pachyderma sinistral, δ18O; Standard error; Turborotalita quinqueloba, δ18O; Trap, sediment; Carlo Erba Flash; Calculated, see references; Isotope ratio mass spectrometry; Irminger Sea; Neogloboquadrina pachyderma; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.753860; https://doi.pangaea.de/10.1594/PANGAEA.753860

We present an almost 3 year long time series of shell fluxes and oxygen isotopes of left-coiling Neogloboquadrina pachyderma and Turborotalita quinqueloba from sediment traps moored in the deep central Irminger Sea. We determined their response to the seasonal change from a deeply mixed water column with occasional deep convection in winter to a thermally stratified water column with a surface mixed layer (SML) of around 50 m in summer. Both species display very low fluxes during winter with a remnant summer population holding out until replaced by a vital population that seeds the subsequent blooms. This annual population overturning is marked by a 0.7 per mill increase in d18O in both species. The shell flux of N. pachyderma peaks during the spring bloom and in late summer, when stratification is close to its minimum and maximum, respectively. Both export periods contribute about equally and account for >95% of the total annual flux. Shell fluxes of T. quinqueloba show only a single broad pulse in ... : Data are not corrected for settling time. ...