First profile measurements of tropospheric BrO

Details First profile measurements of tropospheric BrO First profile measurements of tropospheric BrO

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2921f&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 18, p. 2921-2924

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Atmospheric Composition And Structure, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

Tropospheric BrO profiles (about 0.6+/-0.2ppt, and 2.0+/-0.8ppt at profile maximum) were measured for the first time. Our measurements add new information to recent speculations-based on indirect evidence-of BrO possibly being ubiquitous in the free troposphere [Harder et al., 1998; Frieß et al., 1999; Van Roozendael et al., 1999; Pundt et al., 2000]. Our study relies on a detailed comparison of BrO slant column densities (BrO-SCD) measured in the troposphere from the LPMA/DOAS (Laboratoire de Physique Moléculaire et Applications and Differential Optical Absorption Spectroscopy) gondola by direct Sun absorption, and BrO-SCD values subsequently measured in the lowermost stratosphere during balloon ascent. The difference in total atmospheric BrO-SCDs measured in the troposphere and lowermost stratosphere-after a suitable correction for the change in BrO due to photochemistry and the observation geometry-is then attributed to tropospheric BrO.

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