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Frieß et al. 1999

Frieß, U., Chipperfield, M.P., Harder, H., Otten, C., Platt, U., Pyle, J., Wagner, T. and Pfeilsticker, K. (1999). Intercomparison of measured and modelled BrO slant column amounts for the Arctic winter and spring 1994/95. Geophysical Research Letters 26: doi: 10.1029/1999GL900345. issn: 0094-8276.

Diurnal variations of the slant column amount of BrO (BrO-SCD) measured at Kiruna/Esrange (67.9 ¿N, 21.1 ¿E) in winter/spring 1994/95 are compared with photochemical calculations using the SLIMCAT model. SLIMCAT assumes a total stratospheric bromine of 20 ppt, JPL-97 kinetics but no tropospheric inorganic bromine. Observed local noon BrO-SCDs are underestimated by the model by 20% to 40%. Sensitivity test of existing uncertainties in the stratospheric chemistry of bromine can not resolve the discrepancy. A tropospheric contribution to the total atmospheric BrO, corresponding to a vertical BrO column of 1 to 2¿1013/cm2, (or mixing ratios of 0.75 ppt to 2 ppt assuming an uniform tropospheric height profile) is suggested. ¿ 1999 American Geophysical Union

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	Abstract

Keywords
Atmospheric Composition and Structure

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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