Quantifying the contribution of thermally driven recirculation to a high-ozone event along the Colorado Front Range using lidar
| Autor: | Raul J. Alvarez, Raymond M. Hoff, Christoph Knote, Anne M. Thompson, Russell Long, Patrick J. Reddy, Andrew J. Weinheimer, John T. Sullivan, Grant Sumnicht, Pius Lee, Laurence Twigg, Andrew O. Langford, Thomas J. McGee, Christoph J. Senff |
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| Rok vydání: | 2016 |
| Předmět: |
Pollution
Atmospheric Science Ozone 010504 meteorology & atmospheric sciences media_common.quotation_subject Front (oceanography) Air pollution 010501 environmental sciences Atmospheric sciences medicine.disease_cause 01 natural sciences chemistry.chemical_compound Geophysics Lidar chemistry Space and Planetary Science Earth and Planetary Sciences (miscellaneous) medicine Environmental science Air quality index Air mass 0105 earth and related environmental sciences media_common Return flow |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 121:10-10,390 |
| ISSN: | 2169-897X |
| Popis: | A high-ozone (O3) pollution episode was observed on 22 July 2014 during the concurrent “Deriving Information on Surface Conditions from Column and Vertically Resolved Observations Relevant to Air Quality” (DISCOVER-AQ) and “Front Range Air Pollution and Photochemistry Experiment” (FRAPPE) campaigns in northern Colorado. Surface O3 monitors at three regulatory sites exceeded the Environmental Protection Agency (EPA) 2008 National Ambient Air Quality Standard (NAAQS) daily maximum 8-hr average (MDA8) of 75 ppbv. To further characterize the polluted air mass and assess transport throughout the event, measurements are presented from O3 and wind profilers, O3-sondes, aircraft, and surface monitoring sites. Observations indicate thermally-driven upslope flow was established throughout the Colorado Front Range during the pollution episode. As the thermally-driven flow persisted throughout the day, O3 concentrations increased and affected high-elevation Rocky Mountain sites. These observations, coupled with modeling analyses, demonstrate a westerly return flow of polluted air aloft, indicating the mountain-plains solenoid circulation was established and impacted surface conditions within the Front Range. |
| Databáze: | OpenAIRE |
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