Stratospheric ozone climatology from lidar measurements at Table Mountain (34.4 degrees N, 117.7 degrees W) and Mauna Loa (19.5 degrees N, 155.6 degrees W)

Using more than 1600 nighttime profiles obtained by the Jet Propulsion Labo ratory differential absorption lidars located at Table Mountain Facility (T MF, 34.4 degrees N) and Mauna Loa Observatory (MLO, 19.5 degrees N) stratos pheric ozone climatology is presented ill this paper. These two systems hav e been providing high-resolution vertical profiles of ozone number density between 15 and 50 km for several nights a week since 1988 (TMF) and 1993 (M LO). The climatology presented here is typical of early night ozone values at both sites and typical of a low solar activity period fur MLO. The obser ved seasonal and vertical structure of the ozone concentration at TMF is co nsistent with that typical of middle to subtropical latitudes. A clear annu al cycle in opposite phases below and above the ozone concentration peak is observed. The observed winter maximum below the ozone peak is associated w ith a maximum day-to-day variability, typical of a dynamically driven lower stratosphere. The maximum concentration observed in summer above the ozone peak emphasizes the more dominant role of photochemistry. Unlike TMF, the ozone concentration observed at MLO tends to be higher during the summer mo nths and lower during the winter months throughout the entire stratospheric ozone layer. Only a weak signature of the extratropical latitudes is obser ved near 19-20 km, with a secondary maximum in late winter. The only large variability observed at MLO is in the lowermost stratosphere, which could b e associated with the natural variability of the tropical tropopause.