Environmental Science and Engineering Seminar
A millennial-scale stagnation of Southern Ocean circulation in a past warm climate
New observations from Southern Ocean sediments reveal a spike in authigenic uranium 127,000 years ago, during a period of greater than present warmth. This proxy reflects decreased oxygenation of deep water and therefore a weakening of the Antarctic ocean circulation. Such a change in circulation may have significant implications for predicting how atmospheric CO2 will respond to future climate scenarios. In this talk, I'll review these new observations of the paleo-stagnation event and discuss some implicated causes and mechanisms including the bipolar seesaw and melting of the Antarctic Ice Sheet.
Contact: Kathy Young at 626-395-8732 firstname.lastname@example.org