Reactive iodine species in a semi-polluted environment

Details Reactive iodine species in a semi-polluted environment Reactive iodine species in a semi-polluted environment

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3616803m&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 16, CiteID L16803

Physics

19

Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Geochemical Cycles (1030), Biogeosciences: Trace Gases, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610)

Scientific paper

Iodine chemistry in the marine boundary layer has attracted increasing attention over the last few years because iodine oxides cause ozone destruction, change the atmospheric oxidising capacity, and can form ultrafine particles. However, the chemistry of iodine in polluted environments is not well understood: its effects are assumed to be inhibited by reactions involving NOx (NO2 & NO). This paper describes Differential Optical Absorption Spectroscopy (DOAS) observations of iodine species (I2, OIO and IO) and the nitrate radical (NO3) at a semi-polluted coastal site in Roscoff, France. Significant concentrations of IO and I2 were measured during daytime, indicating efficient recycling of iodine from iodine nitrate (IONO2). I2, IO, OIO and NO3 were observed at night. These observations are interpreted using a one dimensional model to demonstrate that iodine plays an important role even in polluted environments due to recycling mechanisms not considered previously.

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