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Sarnthein, Michael; Gebhardt, Holger; Kiefer, Thorsten; Kucera, Michal; Cook, M; Erlenkeuser, Helmut (2004): Paleoceanography on sediment core MD01-2416. PANGAEA, https://doi.org/10.1594/PANGAEA.738119, Supplement to: Sarnthein, M et al. (2004): Mid Holocene origin of the sea surface salinity low in the Subarctic North Pacific. Quaternary Science Reviews, 23(20-22), 2089-2099, https://doi.org/10.1016/j.quascirev.2004.08.008

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Abstract:
IMAGES core MD01-2416 (51°N, 168°E) provides the first centennial-scale multiproxy record of Holocene variation in North Pacific sea-surface temperature (SST), salinity, and biogenic productivity. Our results reveal a gradual decrease in subarctic SST by 3-5 °C from 11.1 to 4.2 ka and a stepwise long-term decrease in sea surface salinity (SSS) by 2-3 p.s.u. Early Holocene SSS were as high as in the modern subtropical Pacific. The steep halocline and stratification that is characteristic of the present-day subarctic North Pacific surface ocean is a fairly recent feature, developed as a product of mid-Holocene environmental change. High SSS matched a salient productivity maximum of biogenic opal during Bølling-to-Early Holocene times, reaching levels similar to those observed during preglacial times in the warm mid-Pliocene prior to 2.73 Ma. Similar productivity spikes marked every preceding glacial termination of the last 800 ka, indicating recurrent short-term events of mid-Pliocene-style intense upwelling of nutrient-rich Pacific Deepwater in the Pleistocene. Such events led to a repeated exposure of CO2-rich deepwater at the ocean surface facilitating a transient CO2 release to the atmosphere, but the timing and duration of these events repudiate a long-term influence of the subarctic North Pacific on global atmospheric CO2 concentration.
Coverage:
Latitude: 51.268000 * Longitude: 167.725000
Date/Time Start: 2001-06-09T20:05:00 * Date/Time End: 2001-06-09T20:05:00
Event(s):
MD01-2416 (MD012416) * Latitude: 51.268000 * Longitude: 167.725000 * Date/Time: 2001-06-09T20:05:00 * Elevation: -2317.0 m * Recovery: 44.75 m * Location: Emperor Seamounts * Campaign: MD122 (IMAGES VII - WEPAMA) * Basis: Marion Dufresne (1995) * Method/Device: Giant piston corer (GPC) * Comment: Pilot core (trigger core) available: see MD01-2416PC
MD01-2416PC (MD012416PC) * Latitude: 51.268000 * Longitude: 167.725000 * Date/Time: 2001-06-09T20:05:00 * Elevation: -2317.0 m * Penetration: 0.55 m * Location: Emperor Seamounts * Campaign: MD122 (IMAGES VII - WEPAMA) * Basis: Marion Dufresne (1995) * Method/Device: Trigger corer (TC) * Comment: Pilot Core of CALYPSO Giant Piston Core MD01-2416
Size:
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