HR: 0830h
AN: B21F-0773    [PDF]
TI: The Influence of Eolian Deposition on Dissolved Al and Fe Distributions in the North Atlantic During the CLIVAR A16N Cruise
AU: * Measures, C I
EM: chrism@soest.hawaii.edu
AF: University of Hawaii, Dept of Oceanography 1000 Pope Road, Honolulu, HI 96822 United States
AU: Landing, W M
EM: wlanding@mailer.fsu.edu
AF: Florida State University, Dept of Oceanography, Tallahassee, FL 32306 United States
AU: Buck, C S
EM: cbuck@ocean.ocean.fsu.edu
AF: Florida State University, Dept of Oceanography, Tallahassee, FL 32306 United States
AU: Brown, M T
EM: mbrown@soest.hawaii.edu
AF: University of Hawaii, Dept of Oceanography 1000 Pope Road, Honolulu, HI 96822 United States
AB: Dissolved Al and Fe were determined by shipboard FIA on samples collected from the upper 1000m at 62 stations between 62N and 5S in the Atlantic Ocean during the CLIVAR A16N expedition. Contour plots of the distributions reveal a large number of features which are well resolved by the approximately 1 degree sampling resolution. Surface water distributions show significant inputs of both elements from the deposition of Saharan dust into the waters of the equatorial Atlantic. In addition, a large region of sub-surface Al enhancement is observed between 20N and 35N. A region of enhanced deep water Fe values (up to 2nM) is observed between 20N and 5N underlying the Saharan surface water inputs and coincident with the oxygen minimum underlying the high productivity upwelling zone off NW Africa. Initial interpretations of these features and their implications for our understanding of Fe and Al inputs to the surface ocean and the biogeochemical cycles that remove and recycle them will be discussed.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
DE: 0330 Geochemical cycles
DE: 1050 Marine geochemistry (4835, 4850)
DE: 4875 Trace elements
SC: Biogeosciences [B]
MN: 2003 Fall Meeting