Nitrogen and chlorine species in the spring Antarctic stratosphere: Comparison of models with Airborne Antarctic Ozone Experiment observations

Journal Article · Wed Nov 29 23:00:00 EST 1989 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JD094iD14p16683· OSTI ID:7129174

Rodriguez, J M; Ko, M K.W.; Sze, N D; Pierce, S D ^[1]; Anderson, J G ^[2]; Fahey, D W; Kelly, K ^[3]; Farmer, C B; Toon, G C ^[4]; Coffey, M T; Heidt, L E; Mankin, W G ^[5]; Chan, K R; Starr, W L; Vedder, J F ^[6]; McCormick, M P ^[7]

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1. Atmospheric and Environmental Research, Inc., Cambridge, MA (United States)
2. Harvard Univ., Cambridge, MA (United States)
3. NOAA Aeronomy Lab., Boulder, CO (United States)
4. Jet Propulsion Lab., Pasadena, CA (United States)
5. National Center for Atmospheric Research, Boulder, CO (United States)
6. NASA Ames Research Center, Moffett Field, CA (United States)
7. NASA Langley Research Center, Hampton, VA (United States)

The Atmospheric and Environmental Research, Inc., photochemical model has been used to simulate the concentrations and time development of key trace gases in the Antarctic stratosphere before, during, and after the Airborne Antarctic Ozone Experiment (AAOE). The model includes complete gas phase photochemistry and heterogeneous reactions of ClNO{sub 3} (g) and N{sub 2}O{sub 5} (g) with HCl (s) and H{sub 2}O (s). Observations of long-lived species by the AAOE instruments have been used to constrain the initial conditions in these calculations. The authors present results from four cases illustrating the evolution of the trace gases for a range of possible initial conditions and duration of heterogeneous activity. The amount of ClO produced by heterogeneous conversion of HCl is determined not only by the initial concentrations of NO{sub x} (NO + NO{sub 2} + NO{sub 3}),N{sub 2}O{sub 5}, and ClNO{sub 3} during winter, but also by the rate at which NO{sub x} is resupplied by photolysis of N{sub 2}O{sub 5} and HNO{sub 3}, or by transport. Results from the four cases presented bracket column measurements of HCl, ClNO{sub 3}, and HNO{sub 3} by the Jet Propulsion Laboratory and National Center for Atmospheric Research infrared spectrometers on board the NASA DC-8, and in situ measurements of ClO and NO{sub y} by instruments aboard the NASA ER-2. Comparison of results and measurements of HCl and ClO suggests that heterogeneous chemistry was maintained throughout the month of September in 1987. They suggest field observations and kinetic data which would further constrain the photochemistry of the spring Antarctic stratosphere.

• OSTI ID: 7129174
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 94:D14; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

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ABSORPTION SPECTROSCOPY
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ANTARCTIC REGIONS
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CHEMICAL REACTIONS
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