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Improving Regional PM2.5 Modeling along Utah’s Wasatch Front

Published byPetri Korpela Modified over 5 years ago

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Presentation on theme: "Improving Regional PM2.5 Modeling along Utah’s Wasatch Front"— Presentation transcript:

1 Improving Regional PM2.5 Modeling along Utah’s Wasatch Front
Chris Pennell, Nancy Daher 15th Annual CMAS Conference, 2016

2 Outline Background WRF Modeling Platform CAMx Modifications Results
Past Work What’s Next

3 Background Wasatch Front
80% of Utah population 120 miles long, 5 miles wide Surrounded by mountains and lakes Persistent wintertime inversions contribute to PM2.5 NAAQS exceedances Utah is challenging to model Air stability sensitive to winds near mixing height Difficult to sustain inversions Three Utah PM2.5 nonattainment regions Two in Wasatch Front; One in Cache Valley We are simulating Jan 1 – 11, 2011 PCAPS period

4 Logan SLC Lindon

5 Logan SLC SLC, Looking East Lindon SLC, Looking West

6 Logan SLC Lindon

7 WRF Met modeling by Univ. of Utah (Foster, Crosman)
NLCD 2011 land use improvements to Great Salt Lake Increased WRF albedo by changing: MAXALB (maximum albedo) SNUP (increased snow cover)

8 Images courtesy of Chris Foster and Erik Crosman, Univ. of Utah

9 Observations WRF Images courtesy of Chris Foster and Erik Crosman, Univ. of Utah

10 Modeling Platform CAMx 6.30 Two-way nesting (4 km, 1-33 km)
41 vertical layers (no collapsing) CB6r3, CF Zhang dry deposition scheme Custom mods

11 4 km (180 x 186) 1.33 km (201 x 90) Two-way Nesting

12 Jan 8th 24-hour UTC 4 km 1.33 km

13 CAMx Modifications Urban snow cover fraction = 88%
Increases surface albedo Increases ammonium nitrate O3 deposition velocity = 0 More O3 available for NH3, HNO3 oxidation KVPATCH (Ramboll Environ) Increase minimum vertical diffusion coefficients Decreases POA

14 Snow Fraction CAMx (base) WRF CAMx (mod)

15 Monitor locations

16 January 7, 2011 (24-hour mean UTC)
Ozone (ppb) January 7, 2011 (24-hour mean UTC)

17 PNO3 (base) PNO3 (mod) January 7, 2011 (24-hour mean UTC)

18 Simulated PM2.5 (Jan 5 – 10, UTC)

19 24-hour PM2.5 Concentrations
Measured Modeled

20 Jan. 5th Jan. 7th Hawthorne (Salt Lake City) 49.1 µg/m3 29.7 µg/m3

21 Past Work CMAQ 4.7 1 grid at 4 km resolution 14 collapsed layers
Vertical advection off CB05, AERO5 CMAQ 4 km domain

22 36 km UDAQ 2016, 1.33 km Turbulent Fluxes and Pollutant Mixing during Wintertime Air Pollution Episodes in Complex Terrain, Holmes et al. 2015 UDAQ 2014, 4 km

23 Acknowledgements Erik Crosman, Chris Foster (Univ. of Utah)
Gail Tonnesen (EPA) Chris Emery (Ramboll Environ)

24 END

25 Histogram of ozone deposition velocity calculations for the snow-covered period
(early February) inclusive of both nighttime and daytime data. Mean and median ozone deposition velocity were and 0.0 cm s-1 OZONE DEPOSITION VELOCITY DURING SNOW-COVERED AND NON-SNOWCOVERED PERIODS BY EDDY COVARIANCE - Detlev Helmig et al.

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