Daily to decadal variability of size-fractionated iron and iron-binding ligands at the Hawaii Ocean Time-series Station ALOHA

  • Fitzsimmons J
  • Hayes C
  • Al-Subiai S
 et al. 
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Time-series studies of trace metals in the ocean are rare, but they are critical for evaluating both the residence times of the metals themselves and also the timescales over which the marine ecosystems that depend on micronutrient metals can change. In this paper we present two new time-series of the essential micronutrient iron (Fe) taken from the Hawaii Ocean Time-series (HOT) site, Station ALOHA (22.75°N, 158°W): a set of intermittent monthly surface samples taken from ~50 dates between 1999 and 2011 by the HOT program, and a daily-resolved sample set from summer 2012 and 2013 containing ~80 surface samples and 7 profiles to 1500 m depth. The long-term monthly climatology of surface total dissolvable Fe (TDFe) concentrations covaried with the seasonal cycle of continental Asian dust deposition at Hawaii, indicating dust as the major source of TDFe to ALOHA surface waters and a short residence time for TDFe (order ~ months). During the daily summer time-series, surface Fe was most variable in the larger size fractions (>0.4 μm particulate and 0.02-0.4 μm colloidal) and nearly constant in the smallest (

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  • Jessica N. Fitzsimmons

  • Christopher T. Hayes

  • Sherain N. Al-Subiai

  • Ruifeng Zhang

  • Rachel E. Weisend

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