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

Frieß U. | Zendy; Chipperfield M. P. | Zendy; Harder H. | Zendy; Otten C. | Zendy; Platt U. | Zendy; Pyle J. | Zendy; Wagner T. | Zendy; Pfeilsticker K. | Zendy

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

Author(s) -

Frieß U.,

Chipperfield M. P.,

Harder H.,

Otten C.,

Platt U.,

Pyle J.,

Wagner T.,

Pfeilsticker K.

Publication year - 1999

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/1999gl900345

Subject(s) - bromine , noon , troposphere , atmospheric sciences , stratosphere , arctic , environmental science , ozone depletion , the arctic , ozone , polar night , climatology , spring (device) , atmospheric chemistry , mixing ratio , meteorology , chemistry , geology , physics , oceanography , organic chemistry , thermodynamics

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 2×10 13 /cm², (or mixing ratios of 0.75 ppt to 2 ppt assuming an uniform tropospheric height profile) is suggested.

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