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Quantifying the Contribution of Thermally Driven Recirculation to a High-Ozone Event Along the Colorado Front Range Using LidarA 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 8h average (MDA8) of 75ppbv. 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 that 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 that the mountain-plains solenoid circulation was established and impacted surface conditions within the Front Range.
Document ID
20170008889
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sullivan, John T.
(Universities Space Research Association Greenbelt, MD, United States)
McGee, Thomas J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Langford, Andrew O.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Alvarez, Raul J., II
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Senff, Christoph
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Reddy, Patrick J.
(National Center for Atmospheric Research Boulder, CO, United States)
Thompson, Anne M.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Twigg, Laurence W.
(Science Systems and Applications, Inc. Lanham, MD, United States)
Sumnicht, Grant K.
(Science Systems and Applications, Inc. Lanham, MD, United States)
Lee, Pius
(National Oceanic and Atmospheric Administration College Park, MD, United States)
Weinheimer, Andrew
(National Center for Atmospheric Research Boulder, CO, United States)
Knote, Christop
(Ludwig-Maximilians-Univ. Munich, Germany)
Long, Russell W.
(Environmental Protection Agency Research Triangle Park, NC, United States)
Hoff, Raymond M.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Date Acquired
September 20, 2017
Publication Date
September 15, 2016
Publication Information
Publication: Journal of Geophysical Research Atmospheres
Publisher: American Geophysical Union
Volume: 121
Issue: 17
ISSN: 2169-897X
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN41366
Funding Number(s)
CONTRACT_GRANT: NNH15CO48B
CONTRACT_GRANT: NNG12HP08C
CONTRACT_GRANT: MDE U00P4400079
CONTRACT_GRANT: NNX10AT36A
CONTRACT_GRANT: NNX10AR39G
Distribution Limits
Public
Copyright
Other
Keywords
Front Range Air Pollution and Photochemistry Experiment

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