OC3 - Ocean Circulation and Carbon Cycling
Changes in the amount of carbon stored in the oceans are thought to have played an important role in past variations of atmospheric CO2 and climate. Deep circulation controls the ocean's storage and redistribution of heat and carbon. Climate changes in turn affect physical (e.g. dust and iron supply, mixing, upwelling) and biological (e.g. plankton productivity) processes in the oceans.
Recent model simulations imply that a combination of these processes could explain glacial-interglacial CO2 variations. New paleo data reveal the transition of circulation, atmospheric CO2, and climate from the Last Glacial Maximum (~21,000 years ago) to the present in unprecedented detail including several rapid changes; however, the evidence from the deep ocean is still extremely limited.
Link to the external OC3 website.
Observed δ13C distribution in the water column (top; Schmittner et al. 2013) and in surface (Late Holocene) sediments (second from top), in LGM sediments (third from top), and the LGM-LH difference (bottom) (Schmittner, PAGES News (2012), 20:1, 17)
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Publications and presentations
> Report on Preliminary Database (Atlantic) by Emma Gleeman (Research Experience for Undergraduates Student Summer 2015)
> Report on Preliminary Database (Indian & Pacific) by Aaron Rachels (Research Experience for Undergraduates Student Summer 2015)
> Poster at AGU Fall Meeting 2015 - Global Calibration of Benthic Foranimiferal Carbon Isotope Ratios.