Kwiek, P B; Ravelo, Ana Christina (1999): Stable oxygen and carbon isotope record of benthic foraminifera in Pliocene sediments of the Californian margin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.704882, Supplement to: Kwiek, PB; Ravelo, AC (1999): Pacific Ocean intermediate and deep water circulation during the Pliocene. Palaeogeography, Palaeoclimatology, Palaeoecology, 154(3), 191-217, https://doi.org/10.1016/S0031-0182(99)00111-X
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Abstract:
New benthic foraminiferal stable isotopic records of northeast Pacific intermediate water (ODP Site 1014, 1177 m) and mid-depth water (ODP Site 1018, 2476 m) were compared to isotopic records of deep water in the tropical Pacific (ODP Site 849, 3851 m) for the reconstruction of vertical profiles of nutrient and physical properties from the Early Pliocene to the Early Pleistocene (approx. 5-1.4 Ma). Our data indicate that, for the entire interval, there was enhanced north Pacific intermediate water ventilation relative to today, and a similar to modern circulation pattern with northward flowing Pacific Bottom Water (PBW) beneath its southward flowing return flow. However, the core of maximally aged return flow resided as deep as ~2500 m (as compared to ~1500 m today), probably due to the strengthened intermediate water flow. Less apparent aging of deep water along its path before 2.7 Ma indicates that thermohaline overturning may have been more rapid in the warm period of the Early Pliocene. In addition, prior to 2.7 Ma, foraminiferal oxygen isotopic values at mid-depth sites are higher than at deep sites (a reversed vertical gradient relative to today) in both the Atlantic and Pacific Oceans. We suggest that NADW was warmer and more saline than today and that it influenced mid-depth waters throughout the Atlantic and Pacific Oceans. Enhanced Pliocene formation of warmer/saltier intermediate water in the north Pacific, and deep water in the north Atlantic, may have been a result of higher than modern high/mid-latitude sea surface temperatures, evaporation, and salinity.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 34.910750 * Median Longitude: -121.629000 * South-bound Latitude: 32.833200 * West-bound Longitude: -123.277000 * North-bound Latitude: 36.988300 * East-bound Longitude: -119.981000
Date/Time Start: 1996-05-14T22:30:00 * Date/Time End: 1996-06-01T07:30:00
Event(s):
167-1014A * Latitude: 32.833200 * Longitude: -119.981000 * Date/Time Start: 1996-05-14T22:30:00 * Date/Time End: 1996-05-17T11:45:00 * Elevation: -1165.0 m * Penetration: 449 m * Recovery: 404.35 m * Location: North Pacific Ocean * Campaign: Leg167 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 449 m cored; 0 m drilled; 90.1 % recovery
167-1018A * Latitude: 36.988300 * Longitude: -123.277000 * Date/Time Start: 1996-05-29T01:15:00 * Date/Time End: 1996-06-01T07:30:00 * Elevation: -2477.0 m * Penetration: 426.2 m * Recovery: 426.85 m * Location: North Pacific Ocean * Campaign: Leg167 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 426.2 m cored; 0 m drilled; 100.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Kwiek, PB; Ravelo, AC (1999): (Table 3) Stable oxygen and carbon isotope ratios of benthic foraminifera from ODP Hole 167-1014A. https://doi.org/10.1594/PANGAEA.704865
- Kwiek, PB; Ravelo, AC (1999): (Table 3) Stable oxygen and carbon isotope ratios of benthic foraminifera from ODP Hole 167-1018A. https://doi.org/10.1594/PANGAEA.704866