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

被引：22

作者：

Friess, U ^{[1
]}

Chipperfield, MP

Harder, H

Otten, C

Platt, U

Pyle, J

Wagner, T

Pfeilsticker, K

机构：

[1] Heidelberg Univ, Inst Umweltphys, D-69120 Heidelberg, Germany

[2] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

[3] Max Planck Inst Chem, D-55128 Mainz, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 1999年 / 26卷 / 13期

关键词：

D O I：

10.1029/1999GL900345

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Diurnal variations of the slant column amount of BrO (BrO-SCD) measured at Kiruna/Esrange (67.9 degrees N, 21.1 degrees 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 x 10(13)/cm(2), (or mixing ratios of 0.75 ppt to 2 ppt assuming an uniform tropospheric height profile) is suggested.

引用

页码：1861 / 1864

页数：4

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