|Title:||Recent and past dust concentrations and fluxes from a developing array of Antarctic ice cores|
|Author:||McConnell, J.R., Anschutz, H., Baggenstos, D., Das, S.B., Isakkson, E.D., Lawrence, R., Layman, L., Maselli, O., Severinghaus, J.P., Sigl, M., Petit, J.R. and Grente, B.|
|Periodical:||American Geophysical Union, Fall Meeting 2012, abstract #PP22A-08|
Continental dust is an important component of climate forcing, both because of its interaction with incoming solar and outgoing long wave radiation and because of its impact on albedo when deposited on bright surfaces such as fresh snow. Continental dust may also play an important role in ocean fertilization and carbon sequestration. Because the lifetime of dust aerosol in the atmosphere is only on the order of days to weeks, spatial and temporal variability in concentrations and fluxes is high and understanding of recent and long term changes is limited. Here we present and discuss detailed continuous, high depth resolution measurements of a range of dust proxies in a developing array of Antarctic ice cores. Included are traditional proxies such as non-sea-salt (nss) calcium and insoluble particle number and size distribution as well as less traditional proxies such as aluminum, vanadium, manganese, rare earth elements, and nss uranium which together provide important insights into how dust sources and transport may have changed in the past. The array includes a number of new shallow ice core records from East and West Antarctica spanning recent centuries to millennia, as well as Last Glacial Maximum to early Holocene records from the deep WAIS Divide and Taylor Glacier Horizontal ice cores.