Title: Perturbation of Tropical Stratospheric Ozone Through Homogeneous and Heterogeneous Chemistry Due To Pinatubo

Journal Article · · Geophysical Research Letters
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1]
  1. College of Atmospheric Sciences Lanzhou University Lanzhou China
  2. Institute for Environmental and Climate Research Jinan University Guangzhou China
  3. Chemical Science Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
  4. School of Earth and Space Sciences University of Science and Technology of China Hefei China
+ Show Author Affiliations

Abstract The Pinatubo eruption in 1991 injected 10–20 Tg SO 2 into the stratosphere, which formed sulfate aerosols through oxidation. Our modeling results show that volcanic heating significantly perturbs the heterogeneous and homogeneous chemistry including NO x and HO x catalytic cycles in the tropical stratosphere. The simulated tropical chemical ozone tendency is positive at 20 mb while negative at 10 mb in the tropics. The simulated ozone chemical tendency is of the same magnitude as the dynamical ozone tendency caused by the accelerated tropical upwelling, but with the opposite sign. Our study finds that the tropical ozone chemical tendency due to homogeneous chemistry becomes more important than heterogeneous chemistry 3 months after eruption. Sensitivity simulations further suggest that the tropical ozone tendency through heterogeneous chemistry is saturated when the injected amount exceeds 2 Tg.

Research Organization:
US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Biological and Environmental Research (BER)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI ID:
1996031
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 16 Vol. 50; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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54 ENVIRONMENTAL SCIENCES
Brewer-Dobson circulation
Pinatubo aerosol
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gas-phase chemistry
heterogeneous chemistry
tropical ozone