HR: 1340h
AN: PP33C-1582    [Abstracts]
TI: Changes in Atmospheric Flux of Iron to Arctic over past 100 yr
AU: * Edwards, R
EM: redwards@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AU: McConnell, J R
EM: jmcconn@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AU: Banta, J R
EM: rbanta@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AB: Large-scale changes in the Earth's climate throughout the Quaternary have accompanied changes in the emission, atmospheric transport, and deposition of dust-derived iron (Fe). During recent centuries, climate change, changes in land use, and industrial activities have altered the natural variability and chemistry of atmospheric Fe and related aquatic and terrestrial biogeochemical cycles. Recent modeling studies suggest significant declines in atmospheric Fe deposition to high latitudes over the past 30 years. To investigate changes in the atmospheric flux of Fe to the Arctic we have developed several continuous high-temporal resolution records of Fe from Greenland ice cores spanning the past 100 years. These records suggest a decrease in the Fe flux to central Greenland from the 1970s to present, but also suggest that the flux increased in Southern Greenland over the same time period. These changes are likely due to temporal variability in both dust mobilization and atmospheric transport to the sites and the spatial variability of atmospheric transport to different regions of the Greenland ice cap.
DE: 0724 Ice cores (4932)
DE: 1610 Atmosphere (0315, 0325)
DE: 1631 Land/atmosphere interactions (1218, 1843, 3322)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005