Atmospheric Input and Seasonal Inventory of Dissolved Iron in the Sargasso Sea: Implications for Iron Dynamics in Surface Waters of the Subtropical Ocean

Constraining the role of dust deposition in regulating concentration essential micronutrient iron surface ocean waters requires knowledge flux seawater-soluble aerosols and replacement time dissolved (DFe) euphotic zone. Here we estimate these quantities using seasonally resolved DFe data from Bermuda Atlantic Time-series Study region weekly-scale measurements rain during 2019. In response to seasonal changes vertical mixing, primary production deposition, concentrations vary ∼0.2 nM early spring >1 late summer, with inventories ranging ∼30 ∼80 μmol/m2, respectively, over upper 200 m. Assuming approximates steady state for on an annual basis, our aerosol rainwater require a mean euphotic-zone residence ∼0.8–1.9 years respect aeolian input.