Session: Glacial Climates (LGM, Last deglaciation, Ice sheet uncertainties, Glacial-interglacial cycles)
Author: Rhian L. Rees-Owen / email@example.com / University of St Andrews
Co-author: Andrea Burke, University of St Andrews;
James W. B. Rae, University of St Andrews;
Rosanna Greenop, University of St Andrews;
Andy Ridgwell, University of California, Riverside;
Ocean circulation in the high latitudes strongly influences global heat transport, ocean-atmosphere CO2 transport and biological productivity. Rapid reorganisations in ocean circulation during the last glacial cycle have been linked to millennial-scale abrupt climate events. These events had widespread impact on global carbon and nutrient cycling, and can be traced using marine radiocarbon. Here, we present results from transient model runs using the GENIE Earth System Model, simulating nutrients and marine radiocarbon for the glacial climate and stadial events. We explore links between circulation change, nutrients and carbon cycling for the Northern high latitudes, and show that overturning plays a dominant role in North Pacific nutrient budgets and CO2 release. We also demonstrate that the relationship between circulation state and Δ14C can vary through time as a function of atmospheric radiocarbon history, and explore spatial and temporal variations in surface reservoir ages.