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American Geophysical Union, Geophysical Research Letters, 13(26), p. 1861-1864, 1999

DOI: 10.1029/1999gl900345

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Intercomparison of measured and modelled BrO slant column amounts for the Arctic winter and spring 1994/95

Journal article published in 1999 by U. Frieß, M. P. Chipperfield, H. Harder ORCID, C. Otten, U. Platt, J. Pyle, T. Wagner, K. Pfeilsticker
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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.