Mesoscale Meteorological Impacts on Criteria Air Pollutants Along Utah's Wasatch Front as Measured by Mobile Platforms
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1 J6.4 Mesoscale Meteorological Impacts on Criteria Air Pollutants Along Utah's Wasatch Front as Measured by Mobile Platforms Alexander A. Jacques, Erik T. Crosman, John D. Horel, Logan Mitchell, John C. Lin, B. Fasoli and Luke Leclair-Marzolf Department of Atmospheric Sciences, University of Utah 2017 AMS Annual Meeting 13th Symposium of the Urban Environment 25 January 2017
2 Introduction and Motivation Two contrasting air quality concerns in Salt Lake basin: Winter: multi-day secondary particulate (PM 2.5 ) formation Summer: diurnal ozone formation Previous meteorological studies on cold-air pools, but limited analysis of the impact of meteorology on spatial air quality Mobile observations lead the way in Utah s Salt Lake Valley: KSL-5 TV Chopper 5 News Helicopter Light Rail (UTA TRAX) Provide cost-effective observations for recent field studies: Summer 2015: Great Salt Lake Ozone Study (GSLSO 3 S) Winter : Utah DAQ Air Toxics Study Winter : NOAA Utah Winter Fine Particulate Study 2
3 Utah s Salt Lake Valley: Complex Topography Complex basin topography: thermal and terrain-driven flows provide mechanisms for pollutant transport Lake breezes Canyon flows Downslope flows Gap flows Courtesy: Sebastian Hoch 3
4 Multi-day PM 2.5 and Diurnal Ozone Episodes Winter (9 day time series) Summer (3 day time series) 4
5 News Helicopter: Pollutant Monitoring Equipment 2B Technologies 205 Ozone Monitor MetOne ES-642 Remote Dust Monitor Campbell Scientific CR1000 Data Logger GPS and Cellular Communications Data Interval: 10 seconds 5
6 Light Rail Pollutant and Greenhouse Gas Monitoring Monitors installed on two cars (equipment varies on each car) PM 2.5, O 3, CO 2, CH 4, NO 2 Ambient air temperature, humidity, and pressure Data storage locally via data loggers and Raspberry Pi Cellular Communications allow for real-time access to data Trains operate daily on 3 different rail lines across valley Salt Lake Valley 6
7 Mobile Observations of Air Quality Considerable spatial and temporal variability in pollutants Atmospheric chemistry processes Interactions of terrain and thermally-driven flows Vertical stability of PBL Courtesy: Sean Heslin Courtesy: Nola Lucke 7 Courtesy: Sebastian Hoch
8 TRAX Pollutant Spatial Averages: Summer Ozone Night: May Sept 2015 (Hours ) Less urbanization + typical flow off terrain to SW Canyon inflows of background ozone Titration of O3 by NOx in the urban center overnight 8 Salt Lake Valley
9 TRAX Pollutant Spatial Averages: Summer Ozone Afternoon: May Sept 2015 (Hours ) Ozone uniformly distributed across the urban area from mid-day though mid-afternoon. Salt Lake Valley Titration of O3 near I-15 9
10 TRAX Pollutant Spatial Averages: Methane Dec 2014 Nov 2015 (Hours ) Landfill Natural Gas Power Plant Salt Lake Valley 10
11 Case Events 18 Jun 2015 Lake Breeze Lake breeze convergence zone propagating southward from Great Salt Lake through Salt Lake Valley Fixed and mobile observations depicted sharp increase in ozone concentrations as the convergence zone passed Fixed Site and TRAX Light Rail Car 2310 UTC 18 Jun
12 Case Events 18 Jun 2015 Lake Breeze Lake breeze convergence zone propagating southward from Great Salt Lake through Salt Lake Valley Fixed and mobile observations depicted sharp increase in ozone concentrations as the convergence zone passed Chopper 5 Transect and Surface Weather 2320 UTC 18 Jun 2015 Lake Elevation 12
13 Case Events 23 Jul 2016 Antelope Island Wildfire 13
14 Case Events 7-16 Feb 2016 Valley Inversion Strong stable layer in place allowing for buildup of PM2.5 Elevated moisture lead to fog-dominated period Feb 2016 Courtesy: Sean Heslin Courtesy: Sebastian Hoch 14
15 Case Events 7-16 Feb 2016 Valley Inversion Pre-fog event flight: 2315 UTC 9 Feb 0045 UTC 10 Feb Discrete changes as chopper porpoised in/out of pollution layer 0045 UTC 10 Feb 2016 Lake Elevation 15
16 Case Events 7-16 Feb 2016 Valley Inversion Pre-fog event flight: 2315 UTC 9 Feb 0045 UTC 10 Feb Discrete changes as chopper porpoised in/out of pollution layer Pollution layer ~ m deep depending on location Lake Elevation 16
17 Summary Routine helicopter and train air quality data provides a costeffective platform for monitoring distribution of pollutants The spatial characteristics of dust storms, wildfire smoke, and summer and winter boundary-layer urban pollutants captured by these observation platforms in addition to fixed-site monitors Mobile observations show the impact PBL depth, complex terrain, and thermally-driven flows can have on spatial distribution of pollutants Live data remains available: Criteria Pollutants: Trace Gases: 17
18 Manuscripts and Acknowledgements Horel, J., E. Crosman, A. Jacques, B. Blaylock, S. Arens, A. Long, J. Sohl, R. Martin, 2016: Influence of the Great Salt Lake on summer air quality over nearby urban areas. Atmospheric Science Letters, 17, , doi: /asl.680. Blaylock, B., J. Horel, and E. Crosman, 2017: Impact of Lake Breezes on Summer Ozone Concentrations in the Salt Lake Valley. J. Appl. Meteor. Clim. In press. Crosman, E., A. Jacques, and J. Horel, 2017: A Novel Approach for Monitoring Vertical Profiles of Boundary-Layer Pollutants: Utilizing Routine News Helicopter Flights. Accepted pending revisions by Atmospheric Pollution Research. 18
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