Abstract

The modulation of tropospheric ozone by a propagating gravity wave is inferred from the analysis of more than 200 lidar profiles obtained over a 14‐hour period during September 3–4, 1993, near Rollinsville, Colorado (39.9°N, 105.3°W, 2.68 km ms1). Periodic fluctuations of up to 30% in the ozone mixing ratios are attributed to a nearly monochromatic gravity wave with a downward phase velocity of −0.08±0.01 m s−1, a mean vertical wavelength of 3.0±0.5 km, and an apparent frequency of (1.7±0.4)×10−4 s−1. Wind profiles from nearby radar soundings suggest that these fluctuations are induced by a gravity wave that propagates from the NW to SE with a horizontal wavelength of ∼180 km. These results imply that gravity waves may contribute significantly to the short‐term (≤1 day) variability of ozone and other trace gases in the troposphere.

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