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Elevated ozone layers and vertical mixing in the lower fraser valley, British Columbia

The vertical distribution of tropospheric ozone in the Lower Fraser Valley (LFV) is examined. The criteria of what constitutes an elevated ozone layer is defined and a total of 105 profiles from aircraft, tethersonde and free ascent balloons obtained during the period of 1993-1996 were examined and a total of 110 elevated features identified according to these criteria. The results show a rich variety of structures present from the boundary layer up to the upper free troposphere. This richness is shown to be a result of a multitude of generation processes, ranging in scope from the local up to synoptic scales, that interact to produce elevated layers. The layers are typed and sorted according to a classification scheme based on the altitude of the layers with respect to significant atmospheric boundaries, such as the height of the mixed layer, and the specific processes of generation as inferred from other studies performed in similar locales, most significantly within the Los Angeles Basin. Layers are classified as Type I,n,ffl or IV ranging in height from within the mixed layer up to the upper troposphere, with Type I through IU being the result of pollution from within the L F V and Type IV layers being present as a result of long range transport from distant sources. Type I and II layers are shown to have the strongest potential for affecting ground level ozone and may be one of the causes of the strong temporal autocorrelation of diurnal near-surface concentrations, over a time scale of 2 to 5 days, during episode conditions. Slope and sea breeze flows are thought to be of great importance in the creation of Type II and HI elevated pollution layers from L F V sources to heights levels nearing 5000m a.g.l. and distances on the order of 100 km from Greater Vancouver. This suggests pollution exists on a vertical and