Ozone loss in the lower stratosphere over the United States in 1992-1993: Evidence for heterogeneous chemistry on the Pinatubo aerosol
- NOAA Climate Monitoring and Diagnostics Lab., Boulder, CO (United States)
- NOAA Climate Monitoring and Diagnostics Lab., Boulder, CO (United States) Univ. of Colorado, Boulder, CO (United States)
- NOAA Aeronomy Lab., Boulder, CO (United States)
- Univ. of Wyoming, Laramine, WY (United States)
- NASA Goddard Space Flight Center, Wallops Island, VA (United States)
- National Institute of Water Atmospheric Research Ltd., Lauder, Central Otago (New Zealand)
Ozone profiles obtained at Boulder, Colorado and Wallops Island, Virginia indicate that ozone was about 25% below normal during the winter and spring of 1992-93 in the 12-22 km region. This large ozone reduction in the lower stratosphere, though sometimes partially compensated by higher than normal ozone above 24 km, was responsible for the low total column ozone values observed across the United States during this period. Normal temperatures throughout the low ozone region suggest that transport-related effects are probably not the most important cause of the ozone deficits. The region of low ozone at Boulder corresponds closely with the location of the enhanced H[sub 2]SO[sub 4]/H[sub 2]O aerosol from the Pinatubo eruption of 1991 as measured near Boulder and at Laramie, Wyoming. Trajectory analyses suggest that except at low altitudes in spring, air parcels on the days of the ozone measurements generally arrived at Boulder from higher latitude, although seldom higher than 60[degrees]N, and hence may have been subjected to heterogeneous chemical processing on the surface of Pinatubo aerosol droplets resulting in chlorine-catalyzed ozone destruction, a process which is believed to be more effective under the lower winter temperatures and sunlight levels of higher latitudes. 21 refs., 4 figs., 5 tabs.
- OSTI ID:
- 5034670
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (United States), Vol. 21:1; ISSN 0094-8276
- Country of Publication:
- United States
- Language:
- English
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