Natural Pb Fluxes to the Southern Ocean from Accelerated Weathering in Antarctica

Tuesday, 16 December 2014: 9:15 AM
Arthur Russell Flegal Jr1, Kuria Ndungu2, Cheryl M Zurbrick3, Celine Gallon3 and Sharon Elisabeth Stammerjohn4, (1)University of California Santa Cruz, Santa Cruz, CA, United States, (2)Norwegian Institute for Water Research, Bergen, Norway, (3)UCSC, Santa Cruz, CA, United States, (4)University of Colorado Boulder, Boulder, CO, United States
While previous studies have documented the predominance of industrial Pb in Antarctic surface ice and Southern Ocean surface waters, new Pb concentration and isotopic composition measurements indicate those industrial Pb fluxes are now decreasing. Moreover, those data also indicate that natural Pb fluxes to the Southern Ocean may be increasing. That apparent increase is tentatively attributed to accelerated weathering along the Marginal Ice Zone, which is associated with climate change.