The response of ClO radical concentrations to variations in NO_2 radical concentrations in the lower stratosphere

Creators: Stimpfle, R. M.; Koplow, J. P.; Cohen, R. C.; Kohn, D. W.; Wennberg, P. O.; Judah, D. M.; Toohey, D. W.; Avallone, L. M.; Anderson, J. G.; Salawitch, R. J.; Woodbridge, E. L.; Webster, C. R.; May, R. D.; Proffitt, M. H.; Aiken, K.; Margitan, J.; Loewenstein, M.; Podolske, J. R.; Pfister, L.; Chan, K. R.

Abstract

The response of ClO concentrations to changes in NO_2 concentrations has been inferred from simultaneous observations of [ClO], [NO], [NO_2] and [O_3] in the mid-latitude lower stratosphere. This analysis demonstrates that [ClO] is inversely correlated with [NO_2], consistent with formation and photolysis of [ClONO_2]. A factor of ten range in the concentration of NO_2 was sampled (0.1 to 1×10^9 mol/cm^3), with a comparable range in the ratio of [ClO] to total available inorganic chlorine (1% ≤ [ClO]/[Cl_y] ≤ 5%). This analysis leads to an estimate of [ClONO_2]/[Cl_y] = 0.12 (×/÷2), in the mid-latitude, lower-stratospheric air masses sampled.

Additional Information

© 1994 American Geophysical Union. Manuscript Accepted: 29 Aug 1994. Manuscript Received: 22 Jun 1994. Paper number 94GL02373. We thank the pilots and ground crew of the ER-2 based at NASA Ames Research Center. We thank J. Herman,R . McPeters and the NASA GSFC processing team for providing TOMS data. At Harvard we thank B. Heroux for providing Cl resonance lamps; and J. Demusz,N. Allen, N. Hazen, T. Martin,E . Thompson and E. Schomp for computer, software, electrical and mechanical support. This work was supported by NASA grants NAG-l-1305 and HSRP-92-659.

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