Changes in seasonal and diurnal cycles of ozone and temperature in the eastern U.S. |
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| Authors: | Bryan J. Bloomer Konstantin Y. Vinnikov Russell R. Dickerson |
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| Affiliation: | 1. US Environmental Protection Agency, Mail Code 8726F, National Center for Environmental Research, Washington, DC 20460, USA;2. Dept. AOSC, University of Maryland, College Park, MD 20742, USA;1. rdscientific, Newbury, United Kingdom;2. School of Earth Sciences, University of Melbourne, Parkville VIC 3010, Australia;3. Atmospheric Chemistry Services, Okehampton, Devon, United Kingdom;4. Biogeochemistry Research Centre, School of Chemistry, University of Bristol, Bristol, United Kingdom;1. Aix Marseille Université, CNRS, LCE, UMR 7376, 13331, Marseille, France;2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510 640, China;1. Department of Statistics, Colorado State University, 1877 Campus Delivery, Fort Collins, CO 80523-1877, USA;2. National Center for Atmospheric Research, Boulder, CO, USA;3. Department of Mathematical Sciences, Clemson University, Clemson, SC, USA;4. Department of Environmental Sciences, University of California, Riverside, CA, USA;1. Department of Earth and Atmospheric Sciences, University of Houston, 312 Science & Research Building 1, Houston, TX 77204, USA;2. Texas Commission on Environmental Quality, Austin, TX 78711, USA;3. NOAA Air Resources Laboratory, College Park, MD 20740, USA;4. Cooperative Institute for Climate and Satellite, University of Maryland, College Park, MD 20740, USA;1. Architectural Engineering Department, Penn State University, University Park, PA 16802, USA;2. Nanyang Technological University and Berkeley Education Alliance for Research in Singapore, 138602, Singapore;3. Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97207, USA;4. Lawrence Berkeley National Laboratory, Environmental Energy Technologies Division, Indoor Environment Department, 1 Cyclotron Road, MS 70-108B, Berkeley, CA 94720, USA;5. Civil and Environmental Engineering Department, University of California, Berkeley, CA 94720, USA |
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| Abstract: | The pollutant tropospheric ozone causes human health problems, and environmental degradation and acts as a potent greenhouse gas. Using long-term hourly observations at five US air quality monitoring surface stations we studied the seasonal and diel cycles of ozone concentrations and surface air temperature to examine the temporal evolution over the past two decades. Such an approach allows visualizing the impact of natural and anthropogenic processes on ozone; nocturnal inversion development, photochemistry, and stratospheric intrusion. Analysis of the result provides an option for determining the duration for a regulatory ozone season. The application of the method provides independent confirmation of observed changes and trends in the ozone and temperature data records as reported elsewhere. The results provide further evidence supporting the assertion that ozone reductions can be attributed to emission reductions as opposed to weather variation. Despite a (～0.5 °C decade?1) daytime warming trend, ozone decreased by up to 6 ppb decade?1 during times of maximum temperature in the most polluted locations. Ozone also decreased across the emission reduction threshold of 2002 by 6–10 ppb indicating that emission reductions have been effective where and when it is most needed. Longer time series, and coupling with other data sources, may allow for the direct investigation of climate change influence on regional ozone air pollution formation and destruction over annual and daily time scales. |
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