Comment on: "The measurement of tropospheric OH radicals by laser-induced fluorescence spectroscopy during the POPCORN Field Campaign" by Hofzumahaus et al. and "Intercomparison of tropospheric OH radical measurements by multiple folded long-path laser absorption and laser induced fluorescence" by Brauers et al.

Creators: Lanzendorf, E. J.; Hanisco, T. F.; Donahue, N. M.; Wennberg, P. O.

Abstract

Calibration of laser induced fluorescence (LIF) instruments that measure OH is challenging because it is difficult to reliably introduce a known amount of this reactive radical into a measurement apparatus. In a recent paper, Hofzumahaus et al., [1996] describe a novel and seemingly simple technique to accomplish this goal: they dissociate trace quantities of water vapor in air with a low pressure mercury (Hg) lamp to produce low concentrations (10^5 - 10^9 cm^(-3)) of OH (R1).

Additional Information

© 1997 American Geophysical Union. Manuscript Accepted: 8 Oct 1997. Manuscript Received: 11 Mar 1997. Paper number 97GL02899. We thank Dr. Kouichi Yoshino of the Harvard-Smithsonian Center for Astrophysics (H-SCfA) for use of the vacuum ultraviolets pectrometearn df or his expertise. The O_2 cross sections were obtained from the H-SCfA web site: http://cfawww.harvard.edu/amp/data/S-R.html. We thank NASA's Upper Atmospheric Research Program for support.

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