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Iodine monoxide in the Western Pacific marine boundary layer

by K. Gro??mann, U. Frie??, E. Peters, F. Wittrock, J. Lampel, S. Yilmaz, J. Tschritter, R. Sommariva, R. Von Glasow, B. Quack, K. Kr??ger, K. Pfeilsticker, U. Platt show all authors
Atmospheric Chemistry and Physics ()
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A latitudinal cross-section and vertical profiles of iodine monoxide (IO) are reported from the marine boundary layer of the Western Pacific. The measurements were taken using Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) during the TransBrom cruise of the German research vessel Sonne, which led from Tomako- mai, Japan (42◦ N, 141◦ E) through the Western Pacific to Townsville, Australia (19◦ S, 146◦ E) in October 2009. In the marine boundary layer within the tropics (between 20◦ N and 5◦ S), IO mixing ratios ranged between 1 and 2.2 ppt, whereas in the subtropics and at mid-latitudes typical IO mixing ratios were around 1 ppt in the daytime. The profile retrieval reveals that the bulk of the IO was located in the lower part of the marine boundary layer. Photochemical sim- ulations indicate that the organic iodine precursors observed during the cruise (CH3I, CH2I2, CH2ClI, CH2BrI) are not sufficient to explain the measured IO mixing ratios. Reason- able agreement between measured and modelled IO can only be achieved if an additional sea-air flux of inorganic iodine (e.g., I2) is assumed in the model. Our observations add fur- ther evidence to previous studies that reactive iodine is an important oxidant in the marine boundary layer. 1 Introduction Past studies indicated that inorganic iodine may exe

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