McIntyre, K; Ravelo, Ana Christina; Delaney, Margaret Lois (1999): Pliocene-Pleistocene stable oxygen isotope record of Cibicidoides wuellerstorfi from the North Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.698997, Supplement to: McIntyre, K et al. (1999): North Atlantic intermediate waters in the Late Pliocene to Early Pleistocene. Paleoceanography, 14(3), 324-335, https://doi.org/10.1029/1998PA900005
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We generated benthic isotope records from Ocean Drilling Program (ODP) site 981 on the Feni drift (2173 m water depth) and from ODP site 983 on the Gardar drift (1983 m water depth) to examine the interaction between North Atlantic Deep Water (NADW) and Glacial North Atlantic Intermediate Water (GNAIW) formation from 2.0 to 1.4 Ma. We find NADW at both sites during interglacial periods, and a mix of NADW and Southern Ocean water at the Feini drift during most glacial periods. Prior to 1.7 Ma we find no evidence ofr GNAIW at the Gardar drift site. Instead, glacial Gardar drift delta13C values are as low or lower than values for all other sites in the North Atlantic and reflect continued glacial overflow from the Nordic seas. After 1.7 Ma Gardar drift delta13C values increase and suggest that there was GNAIW at the Gardar drift site during some glacial intervals. Overall, we find that NADW and GNAIW production changed around 1.7 Ma in concert with changes in sea surface temperature and salinity and in the Earth's obliquity cycle.
Median Latitude: 57.940450 * Median Longitude: -19.145733 * South-bound Latitude: 55.477400 * West-bound Longitude: -23.640667 * North-bound Latitude: 60.403500 * East-bound Longitude: -14.650800
Date/Time Start: 1995-07-12T00:00:00 * Date/Time End: 1995-07-24T00:00:00
162-981 * Latitude: 55.477400 * Longitude: -14.650800 * Date/Time Start: 1995-07-12T00:00:00 * Date/Time End: 1995-07-15T00:00:00 * Elevation: -2277.3 m * Penetration: 822.1 m * Recovery: 848.6 m * Location: North Atlantic Ocean * Campaign: Leg162 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 88 cores; 822.1 m cored; 0 m drilled; 103.2% recovery
162-983 * Latitude: 60.403500 * Longitude: -23.640667 * Date/Time Start: 1995-07-21T00:00:00 * Date/Time End: 1995-07-24T00:00:00 * Elevation: -1983.7 m * Penetration: 766.5 m * Recovery: 798 m * Location: North Atlantic Ocean * Campaign: Leg162 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 82 cores; 766.5 m cored; 0 m drilled; 104.1% recovery