Iodine monoxide in the Western Pacific marine boundary layer.

Großmann, K., Frieß, U., Peters, E., Wittrock, F., Lampel, J., Yilmaz, S., Tschritter, J., Sommariva, R., von Glasow, R., Quack, Birgit, Krüger, Kirstin, Pfeilsticker, K. and Platt, U. (2013) Iodine monoxide in the Western Pacific marine boundary layer. Open Access Atmospheric Chemistry and Physics, 13 (6). pp. 3363-3378. DOI 10.5194/acp-13-3363-2013.

[img]
Preview
Text
acp-13-3363-2013.pdf - Published Version
Available under License Creative Commons Attribution.

Download (1759Kb) | Preview

Supplementary data:

Abstract

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 Tomakomai, 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 simulations indicate that the organic iodine precursors observed during the cruise (CH3I, CH2I2, CH2ClI, CH2BrI) are not sufficient to explain the measured IO mixing ratios. Reasonable 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 further evidence to previous studies that reactive iodine is an important oxidant in the marine boundary layer.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/226224
Additional Information: WOS:000316961000027
Keywords: ABSORPTION CROSS-SECTIONS; TROPICAL ATLANTIC-OCEAN; SPECTROSCOPY MAX-DOAS; ATMOSPHERIC IODINE; RADIATIVE-TRANSFER; HALOGEN CHEMISTRY; TROPOPAUSE LAYER; REACTIVE IODINE; SEA-SURFACE; OZONE
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/acp-13-3363-2013
ISSN: 1680-7316
Projects: TRANSBROM, SHIVA, SOPRAN, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 29 Nov 2012 10:17
Last Modified: 30 May 2013 13:46
URI: http://oceanrep.geomar.de/id/eprint/19379

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...