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Climate Seminar - 05/13/2019 - Galen A. McKinley, LDEO

"Forced mechanisms explain recent variability of the ocean carbon sink"

The ocean has absorbed the equivalent of 41% of industrial-age fossil carbon emissions, substantially damping climate change. Yet, understanding of the sink’s decadal variability is limited, with recent studies concluding that modeled fluxes are much less variable than observed fluxes; in fact, however, these estimates agree. Globally, outside of t he eastern equatorial Pacific, there was a sharp increase in the ocean sink in the early 1990s, followed by a decline to an early 2000s minimum. Using a box model, I attribute these changes to external forcing. The increased sink of the early 1990s was driven by surface cooling following the Mt. Pinatubo eruption. The subsequent sink decline was due to ocean warming associated with the recovery from Pinatubo. Ocean sink growth from the early 2000s to present was driven by the enhanced growth rate of atmospheric pCO2. 

Location: Guyot Hall - Room 220

Date/Time: 05/13/19 at 4:00 pm - 05/13/19 at 5:00 pm

Category: Break

Department: Geosciences