HR: 1340h
AN: GC23A-1296    [Abstracts]
TI: The Origin of Water Soluble Particulate Iron in the Asian Atmospheric Outflow
AU: * Chuang, P Y
EM: pchuang@es.ucsc.edu
AF: Department of Earth Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 United States
AU: Duvall, R M
EM: rmduvall@students.wisc.edu
AF: Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Room 122, 680 North Park Street, Madison, WI 53706 United States
AU: Shafer, M M
EM: mmshafer@facstaff.wisc.edu
AF: Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Room 122, 680 North Park Street, Madison, WI 53706 United States
AU: Schauer, J J
EM: jjschauer@wisc.edu
AF: Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Room 122, 680 North Park Street, Madison, WI 53706 United States
AB: Iron, and in particular water soluble iron, is an important trace nutrient in the surface ocean, and therefore an important component in the global carbon cycle. Deposition of Asian aerosol is thought to be a primary source of water soluble iron in the northern Pacific. Analysis of aerosol samples obtained during the Aerosol Characterization Experiment (ACE)-Asia field campaign from Jeju Island, Korea, which intercepts the outflow from the Asian continent, shows that water soluble iron is not dominated by mineral dust sources even during large dust storms. Instead, our analysis indicates that particulate soluble iron and elemental carbon concentrations are correlated. This leads to the conclusion that soluble iron in this region is strongly connected to anthropogenic activity and not connected to mineral dust emissions, especially if the budget averaged over annual time scales is considered. This is a significant change from the typical view of the iron budget in this region, and therefore has important implications for the carbon cycle.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0428 Carbon cycling (4806)
DE: 1615 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 4805, 4912)
DE: 3300 ATMOSPHERIC PROCESSES
DE: 3311 Clouds and aerosols
SC: Global Climate Change [GC]
MN: Fall Meeting 2005