Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

van Geen, Alexander; Fairbanks, Richard G; Dartnell, Peter; McGann, Mary L; Gardner, James V; Kashgarian, Michaele (1996): Geochemistry of foraminifera from sediment cores of the central California margin. PANGAEA, https://doi.org/10.1594/PANGAEA.729962, Supplement to: van Geen, A et al. (1996): Ventilation changes in the northeast Pacific during the last deglaciation. Paleoceanography, 11(5), 519-528, https://doi.org/10.1029/96PA01860

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
Under present climate conditions, convection at high latitudes of the North Pacific is restricted to shallower depths than in the North Atlantic. To what extent this asymmetry between the two ocean basins was maintained over the past 20 kyr is poorly known because there are few unambiguous proxy records of ventilation from the North Pacific. We present new data for two sediment cores from the California margin at 800 and 1600 m depth to argue that the depth of ventilation shifted repeatedly in the northeast Pacific over the course of deglaciation. The evidence includes benthic foraminiferal Cd/Ca, 18O/16O, and 13C/12C data as well as radiocarbon age differences between benthic and planktonic foraminifera. A number of features in the shallower of the two cores, including an interval of laminated sediments, are consistent with changes in ventilation over the past 20 kyr suggested by alternations between laminated and bioturbated sediments in the Santa Barbara Basin and the Gulf of California [Keigwin and Jones, 1990 doi:10.1029/PA005i006p01009; Kennett and Ingram, 1995 doi:10.1038/377510a0; Behl and Kennett, 1996 doi:10.1038/379243a0]. Data from the deeper of the two California margin cores suggest that during times of reduced ventilation at 800 m, ventilation was enhanced at 1600 m depth, and vice versa. This pronounced depth dependence of ventilation needs to be taken into account when exploring potential teleconnections between the North Pacific and the North Atlantic.
Coverage:
Median Latitude: 36.423333 * Median Longitude: -122.340833 * South-bound Latitude: 35.623333 * West-bound Longitude: -123.243333 * North-bound Latitude: 37.223333 * East-bound Longitude: -121.438333
Event(s):
F2-92-P3 * Latitude: 35.623333 * Longitude: -121.438333 * Elevation: -799.0 m * Location: Pacific Ocean * Device: Piston corer (PC)
F8-90-G21 * Latitude: 37.223333 * Longitude: -123.243333 * Elevation: -1605.0 m * Location: Pacific Ocean * Device: Piston corer (PC)
Size:
8 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )