Cavaleiro, Catarina; Voelker, Antje H L; Stoll, Heather M; Baumann, Karl-Heinz; Kulhanek, Denise; Naafs, Bernhard David A; Stein, Ruediger; Gruetzner, Jens; Ventura, C; Kucera, Michal (2018): Coccolithophore productivity in the North Atlantic during the Middle Pleistocene based on coccolith fraction Sr/Ca ratios from IODP Hole 306-U1313D. PANGAEA, https://doi.org/10.1594/PANGAEA.890342, Supplement to: Cavaleiro, C et al. (2018): Insolation forcing of coccolithophore productivity in the North Atlantic during the Middle Pleistocene. Quaternary Science Reviews, 191, 318-336, https://doi.org/10.1016/j.quascirev.2018.05.027
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Coccolithophores play a key role in the oceanic carbon cycle through the biological and carbonate pumps. Understanding controls on coccolithophore productivity is thus fundamental to quantify oceanic carbon cycling. We investigate changes in coccolithophore productivity over several Pleistocene glacial-interglacial cycles using a high-resolution coccolith Sr/Ca ratio record, which is an indicator of growth rate and thus a proxy for coccolithophore productivity. We use Middle Pleistocene sediments from the North Atlantic Integrated Ocean Drilling Program (IODP) Site U1313 (41.00' N, 32.58' W) spanning Marine Isotopic Stages 16 to 10 (638 to 356 kyr). The location of the record allows us to investigate processes affecting productivity in a mid-latitude setting and to unravel the effects of temperature and regional ocean circulation. Coccolithophore productivity shows a dominant glacial-interglacial cyclicity with higher productivity during glacials, which appears to reflect the southward migration of the North Atlantic high productivity zone currently located between 45º and 55º N. Spectral analysis of the productivity record reveals a suborbital variability consistent with forcing by insolation maxima superimposed on the front migration pattern. Similar to today, coccolithophore productivity during interglacials was enhanced when insolation was at its maximum in spring or in autumn, whereas during glacials, productivity was enhanced when summer/autumn insolation was at its maximum. We show that in the studied region, coccolithophore productivity was driven by processes reflecting regional insolation. Applying this information to model experiments is required to assess if coccolithophore productivity played a significant role in past changes of atmospheric CO2.
Latitude: 41.000019 * Longitude: -32.957023
Datasets listed in this publication series
- Cavaleiro, C; Voelker, AHL; Stoll, HM et al. (2018): Accumulation rate of nannofossils from IODP Hole 306-U1313D. https://doi.org/10.1594/PANGAEA.890340
- Cavaleiro, C; Voelker, AHL; Stoll, HM et al. (2018): Calcium carbonate analysis from IODP Hole 306-U1313D. https://doi.org/10.1594/PANGAEA.890341
- Cavaleiro, C; Voelker, AHL; Stoll, HM et al. (2018): Coccolith assemblage and coccolith dissolution index from IODP Hole 306-U1313D. https://doi.org/10.1594/PANGAEA.890339
- Cavaleiro, C; Voelker, AHL; Stoll, HM et al. (2018): Isotopic analysis (δ¹⁸O & δ¹³C) of benthic foraminifera from IODP Hole 306-U1313D. https://doi.org/10.1594/PANGAEA.890337
- Cavaleiro, C; Voelker, AHL; Stoll, HM et al. (2018): Neogloboquadrina pachyderma analysis from IODP Hole 306-U1313D. https://doi.org/10.1594/PANGAEA.890336
- Cavaleiro, C; Voelker, AHL; Stoll, HM et al. (2018): Strontium/Calcium ratio of Coccolith fractions from IODP Hole 306-U1313D. https://doi.org/10.1594/PANGAEA.890338