Lagrangian sampling of 3-D air quality model results for regional transport contributions to sulfate aerosol concentrations at Baltimore,MD, in summer 2004 |
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| Authors: | T Duncan Fairlie James Szykman Alice Gilliland R Bradley Pierce Chieko Kittaka Stephanie Weber Jill Engel-Cox Raymond R Rogers Joe Tikvart Rich Scheffe Fred Dimmick |
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| Institution: | 1. U.S. National Aeronautics and Space Administration, Langley Research Center, Science Directorate, Hampton, VA 23681, USA;2. U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Research Triangle Park, NC 27711, USA;3. National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Services, Madison, WI 53706, USA;4. Science Applications International Corporation (SSAI), Hampton, VA 23666, USA;5. Battelle Memorial Institute, Columbus, OH 43201, USA;6. Battelle Memorial Institute, Arlington, VA 22201, USA;7. U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711, USA;1. Department of Physics, Faculty of Science, Silpakorn University, Nakhon Pathom 73000, Thailand;2. School of Land and Food, University of Tasmania, Hobart 7001, Australia;1. Research Institute for Applied Mechanics (RIAM), Kyushu University, Fukuoka, Japan;2. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing, China;3. University of Yamanashi, Yamanashi, Japan;4. National Institute for Environmental Studies (NIES), Tsukuba, Ibaraki, Japan;5. Fukuoka Institute of Health and Environmental Sciences, Fukuoka, Japan;1. Envair, 526 Cornell Ave., Albany, CA 94706, United States;2. Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, United States;3. Atmospheric Research and Analysis, 410 Midenhall Way, Cary, NC 27513, United States;4. Envair/Aerochem, 6 Evergreen Dr, Placitas, NM 87043, United States;5. Electric Power Research Institute, 3420 Hillview Avenue, Palo Alto, CA 94303, United States;1. Envair, 526 Cornell Avenue, Albany, CA 94706, USA;2. Envair/Aerochem, 6 Evergreen Dr, Placitas, NM 87043, USA |
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| Abstract: | We use ensemble-mean Lagrangian sampling of a 3-D Eulerian air quality model, CMAQ, together with ground-based ambient monitors data from several air monitoring networks and satellite (MODIS) observations to provide source apportionment and regional transport vs. local contributions to sulfate aerosol and PM2.5 concentrations at Baltimore, MD, for summer 2004. The Lagrangian method provides estimates of the chemical and physical evolution of air arriving in the daytime boundary layer at Baltimore. Study results indicate a dominant role for regional transport contributions on those days when sulfate air pollution is highest in Baltimore, with a principal transport pathway from the Ohio River Valley (ORV) through southern Pennsylvania and Maryland, consistent with earlier studies. Thus, reductions in sulfur emissions from the ORV under the EPA's Clean Air Interstate Rule may be expected to improve particulate air quality in Baltimore during summer. The Lagrangian sampling of CMAQ offers an inexpensive and complimentary approach to traditional methods of source apportionment based on multivariate observational data analysis, and air quality model emissions separation. This study serves as a prototype for the method applied to Baltimore. EPA is establishing a system to allow air quality planners to readily produce and access equivalent results for locations of their choice. |
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