Time-series analysis of ozone in the Baltimore-Washington area
Conference
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OSTI ID:351011
- Maryland Dept. of Natural Resources, Annapolis, MD (United States). Power Plant Research Program
- Science Applications International Corp., Raleigh, NC (United States). Integrated Environmental Assessment Div.
Characterization of the temporal and spatial variability of ozone is important for planning and implementation of emissions controls to minimize the occurrence of exceedances of the National Ambient Air Quality Standards. The focus of this study is to provide a long-term (i.e. 12-years, 1981--1992) climatology of the seasonal, annual, intra-annual and inter-annual variations of ozone and surface meteorology in the Baltimore-Washington region, which is located at the southern end of the Clean Air Act-mandated Northeast Ozone Transport Region (OTR). The area was divided into four regions: urban Baltimore, MD; urban Washington, DC; non-urban Maryland; and, non-urban Northern Virginia. The annual mean departure statistics for Baltimore, non-urban Maryland and non-urban Northern Virginia all had positive departures in 1981, 1984, 1989 and 1992. The annual mean departure statistics for Washington, DC were substantially different from the other three regions. However, the summer (i.e. June-- August) mean departure statistics for all four regions were similar. In general, positive departures were found in 1983, 1988 and 1991 with negative departures occurring in 1981, 1985, 1989 and 1992. Nominally, 50% of the exceedances had concentrations ranging from 120 to 130 ppb and about 75% were in the range of 120 to 140 ppb. The individual ozone and meteorological time series were divided into four terms, representing the different behavioral time scales: long-term mean; the mean intra-annual perturbation; the inter-annual perturbation; and, the synoptic perturbation. The synoptic perturbation for the non-urban areas was linked closely to the synoptic cycle (i.e. 3--10 days), which indicates that net increases/decreases in ozone at these time scales is highly dependent on synoptic-scale weather systems. Under episodic conditions, the synoptic perturbation contributed approximately 40-55% of the total ozone concentration.
- OSTI ID:
- 351011
- Report Number(s):
- CONF-970677--
- Country of Publication:
- United States
- Language:
- English
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