We participated in the first open ocean iron enrichment study by
establishing a Lagrangian reference frame for the experiment, and
identifying the physical processes contributing to the dispersion of
the SF6 tagged, iron enriched surface patch. A GPS
navigated, drogued drifter buoy defined the center of an 8 by 8 km
patch of trace iron and SF6 while the mixed layer patch was
being formed over a 24 hour period. The buoy telemetered its position
to a shipboard computer every 10 minutes allowing a Lagrangian
reference frame to be established for the patch formation and
subsequent patch mapping over the following 8 days. Continuous ADCP
measurements and daily towyo CTD and thermal microstructure
measurements helped define the processes responsible for vertical and
horizontal spreading of the patch.
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