Stable carbon and oxygen isotope ratios of planktonic and benthic foraminifera from ODP Site 162-982 in the North Atlantic ...

• Main Authors: Venz, Kathryn A, Hodell, David A, Stanton, Cathy, Warnke, Detlef A
• Format: Dataset
• Language: English
• Published: PANGAEA 1999
• Subjects: DEPTH, sediment/rock; AGE; Sample code/label; Cibicidoides spp., δ18O; Cibicidoides spp., δ13C; Globigerina bulloides, δ18O; Globigerina bulloides, δ13C; Calcium carbonate; Ice rafted debris; Composite Core; DSDP/ODP/IODP sample designation; Mass spectrometer VG Isogas Prism; Coulometric titration Knap et al., 1996, IOC Manuals and Guides 29, UNESCO; Counting 250-2000 µm fraction; Leg162; Joides Resolution; Ocean Drilling Program ODP; NADW; Nordic Seas; North Atlantic Deep Water; North Atlantic; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.700897; https://doi.pangaea.de/10.1594/PANGAEA.700897

Changes in the intermediate water structure of the North Atlantic were reconstructed using benthic foraminiferal delta13C at Ocean Drilling Program (ODP) site 982 for the past 1.0 Myr. During most terminations of the late Pleistocene, melting of icebergs and low-salinity surface waters caused production of Glacial North Atlantic Intermediate Water to cease, resulting in decreased ventilation of the middepth North Atlantic. Poor ventilation of intermediate water masses lasted well into some interglacial stages until upper North Atlantic Deep Water (NADW) production resumed under full interglacial conditions. The magnitude of benthic delta13C minima and ice-rafted debris maxima at terminations at site 982 generally match the degree of glacial suppression of NADW inferred from site 607. These processes may be related and controlled by the spatial and seasonal extent of sea ice cover during glaciations in the Nordic Seas. ... : Depth is composite depth (mcd) ...