Ground-based measurements of tropospheric and stratospheric BrO at Arrival Heights, Antarctica

Details Ground-based measurements of tropospheric and stratospheric BrO at Arrival Heights, Antarctica Ground-based measurements of tropospheric and stratospheric BrO at Arrival Heights, Antarctica

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3021k&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 23, p. 3021-3024

Computer Science

Sound

52

Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Ground-based measurements of BrO slant column densities (SCDs) were performed using zenith sky DOAS (Differential Optical Absorption Spectroscopy) during autumn (February to May) and spring (August to October) of 1995 at Arrival Heights (77.8°S, 166.7°E). In both August and September, single episode of sudden large BrO column enhancement (of magnitude 3.5 and 3.2×1014molec.cm-2 respectively) were observed. The episode in August did not coincide with changes of other stratospheric parameters (OClO, NO2 and temperature). Furthermore, the diurnal variation in the SCD during these events was indicative of a tropospheric rather than a stratospheric absorber. The tropospheric BrO mixing ratios deduced from the data are similar to those observed by ground-based measurements in the Arctic boundary layer (~30ppt). Simultaneous balloon soundings, one during each of the two events, showed statistically significant (2 σ) tropospheric ozone depletion between 0.5 and 2 km in August and 1.5 and 2.8 km in September. Our results strongly suggest that halogen catalysed boundary layer ozone depletion not only occurs in the Arctic but also in Antarctica. This has the implication that Arctic Haze and anthropogenic influence is unlikely as a cause for this phenomenon.

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