On the occurrence of ClO in cirrus clouds and volcanic aerosol in the tropopause region

Details On the occurrence of ClO in cirrus clouds and volcanic aerosol in the tropopause region On the occurrence of ClO in cirrus clouds and volcanic aerosol in the tropopause region

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2011b&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 16, p. 2011-2014

Physics

15

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Volcanic Effects

Scientific paper

Airborne observations during descents of the ER-2 through layers of volcanic aerosol (Mount Pinatubo eruption of 1991) and a cirrus cloud are utilized to study the the abundance of ClO and its relation to aerosol surface area in the midlatitude tropopause region. During a cirrus event near the tropopause ClO mixing ratios up to 2.7 pptv were detected and near the tropopause ClO levels from a few to 70 pptv were found. These measurements are associated with large experimental uncertainties but demonstrate the possible presence of ClO inside cirrus clouds and near the tropopause. Model calculations show that possible enhancements of ClO by heterogeneous chemistry on cirrus cloud particles could considerably increase the ozone loss rates and could have implications for the ozone budget in this region. It is not possible to decide from the limited data base whether the observed ClO levels are due to transport or heterogeneous chemistry.

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