Millennial-scale deep water oscillations: Reflections of the North Atlantic in the deep Pacific from 10 to 60 ka

摘要: Northeast Pacific benthic foraminiferal δ18O and δ13 reveal repeated millennial-scale events of strong deep-sea ventilation (associated with nutrient depletion and/or high gas exchange) during stadial (cool, ice volume) episodes from 10 to 60 ka, opposite the pattern in deep North Atlantic. Two climate mechanisms may explain this pattern. surface waters, chilled by atmospheric transmission a cold Atlantic made saltier reduced freshwater vapor transports, could have ventilated above. Alternatively, faster turnover bottom mid-depth driven Southern Ocean winds, compensated for suppressed Deep Water production intervals. During Younger Dryas event (∼11.6–13.0 cal ka), NE (∼2700 m) lagged that Santa Barbara Basin (∼450 >500 years, suggesting was first at intermediate depth above then greater below. This apparent lag reflect adjustment time global thermohaline circulation.