Effects of the Mt. Pinatubo eruption on the radiative and chemical processes in the troposphere and stratosphere
The LLNL 2-D zonally averaged chemical-radiative transport model of the global atmosphere was used to study the effects of the June 15, 1991 eruption of the Mt. Pinatubo volcano on stratospheric processes. SAGE-11 time-dependent aerosol surface area density and optical extinction data were used as input into the model. By the winter solstice, 1991, a maximum change in column ozone was observed in the equatorial region of {minus}2% (with heterogeneous chemical reactions on sulfuric acid aerosols) and {minus}5.5% (including heterogeneous reactions plus radiative feedbacks). Maximum local ozone decreases of 12% were derived in the equatorial region, at 25 km, for winter solstice 1991. Column NO{sub 2} peaked ({minus}14%) at 30 S in October 1991. Local concentrations of NO{sub x}, Cl{sub x}, and HO{sub x}, in the lower stratosphere, were calculated to have changed between 30 S and 30 N by {minus}40%, +80%, and +60% respectively.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10173825
- Report Number(s):
- UCRL-JC--108956; CONF-9206262--4; ON: DE92019618
- Country of Publication:
- United States
- Language:
- English
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