Oceanography Seminar - Ann Dunlea
January 17, 1:00pm - 2:00pm
Mānoa Campus, POST 127
â€œRethinking the role of the seafloor in ocean chemistry and long-term climateâ€
What controls the long-term trajectory of Earthâ€™s climate and ocean chemistry? How do marine sediments regulate â€“ and bear witness to â€“ these changes? My research investigates the diverse and dynamic sub seafloor geochemical processes interacting with the ocean and longterm changes in climate. In this talk, I will present a new hypothesis supported with empirical evidence that invokes changes in reverse weathering on the seafloor to explain the increase in seawater Mg/Ca and global cooling observed over the past 50 million years. This hypothesis inverts the prevailing mechanisms that require an increase in silicate weathering as the driver of many elemental and isotopic trends over the Cenozoic. Additionally, this research opens avenues to reconsider the role of the seafloor in many (bio)geochemical and climate enigmas.
Department of Oceanography, Mānoa Campus
Angel White, (808) 956-6220, email@example.com, http://www.soest.hawaii.edu/oceanography/seminar.html, Oceanography Seminar - Ann Dunlea (PDF)