Iodine containing species in the remote marine boundary layer: A link to oceanic phytoplankton

S. C. Lai, J. Williams, S. R. Arnold, Elliot L Atlas, S. Gebhardt, T. Hoffmann

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Abstract

Iodine containing species have been measured in the particle phase (PM 2.5) and the gas phase during a ship campaign between January and February 2007 in the South Atlantic marine boundary layer (MBL). Methyl iodide (CH3I) in the gas phase and soluble iodine species, i.e. iodide, iodate and an unidentified organic iodine species (UOI), in PM2.5 were measured. Temporal variations of gaseous and particulate iodine species were investigated. The exposure of the sampled air masses to phytoplankton along the back-trajectories was studied using a lagrangian transport model and satellite observations of oceanic chlorophyll-a concentration. Significant correlations were found between the concentrations of iodine species and the average chlorophyll exposure along back-trajectories, indicating an emission from phytoplankton in the open ocean. Good correlations were found when the ship approached or crossed the active biological region in the West-southern Atlantic. These results strongly suggest a connection between iodine species and the phytoplankton in the ocean. This study was extended to examine the relation of the iodine measurements to satellite derived phytoplankton distributions. We show that specific phytoplankton species may have impact on different iodine containing species.

Original languageEnglish (US)
Article numberL20801
JournalGeophysical Research Letters
Volume38
Issue number20
DOIs
StatePublished - 2011

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phytoplankton
iodine
boundary layers
boundary layer
iodide
chlorophylls
ships
iodides
oceans
trajectory
trajectories
vapor phases
iodates
satellite observation
air masses
open ocean
gas
air mass
particulates
chlorophyll a

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Iodine containing species in the remote marine boundary layer : A link to oceanic phytoplankton. / Lai, S. C.; Williams, J.; Arnold, S. R.; Atlas, Elliot L; Gebhardt, S.; Hoffmann, T.

In: Geophysical Research Letters, Vol. 38, No. 20, L20801, 2011.

Research output: Contribution to journalArticle

Lai, S. C. ; Williams, J. ; Arnold, S. R. ; Atlas, Elliot L ; Gebhardt, S. ; Hoffmann, T. / Iodine containing species in the remote marine boundary layer : A link to oceanic phytoplankton. In: Geophysical Research Letters. 2011 ; Vol. 38, No. 20.
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