Project: Improving Air Quality Modeling for the Wasatch Front/Cache Valley Winter Air Pollution Episodes Erik Crosman 1, John Horel 1, Lance Avey 2, Chris.

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Presentation transcript:

Project: Improving Air Quality Modeling for the Wasatch Front/Cache Valley Winter Air Pollution Episodes Erik Crosman 1, John Horel 1, Lance Avey 2, Chris Foster 1, Erik Neemann 1, Brian Blaylock 1, 1 University of Utah Department of Atmospheric Sciences 2 Utah Division of Air Quality

Study Objectives Determine appropriate WRF atmospheric model configurations including treatment of the underlying surface to improve simulations of wintertime cold pool events along the Wasatch Front and in the Cache Valley that lead to high PM2.5 pollution Collaborate with Utah DAQ staff to identify and simulate selected cold-air pool episodes to be used in PM2.5 SIP development

Research to Improve Wintertime Cold Air Pool Simulations in 4 Key Areas Surface state characterization (e.g., snow, albedo, land use, vegetation) Initialization Cloud microphysics Boundary-layer turbulence

October : Complete identification of possible prior winter case studies with DAQ staff; Case 1 choosen: PCAPS IOP5 (Jan ) Case 2 uncertain: PCAPS IOP1 (mix-out midway through episode?) November : Graduate student attends CMAQ workshop to become familiar with atmospheric modeling needs required for CMAQ during late October. Chris Foster attended CMAS 2014 workshop and conference One-on-one training for use of DAQ CMAQ system with Lance scheduled for early December 2014 December Complete testing of WRF sensitivity to land surface schemes (USGS, NLCD, MODIS) and snow cover options. On track to meet testing to 3 land surface schemes (see later slides). Timeline/Progress Update

Bigger Picture Timeline October : Complete identification of possible prior winter case studies with DAQ staff; Case 1 choosen: PCAPS IOP5 (Jan ) Case 2 uncertain: PCAPS IOP1 (mix-out midway through episode?) November : Graduate student attends CMAQ workshop to become familiar with atmospheric modeling needs required for CMAQ during late October. Chris Foster attended CMAS 2014 workshop and conference One-on-one training for use of DAQ CMAQ system with Lance scheduled for early December 2014 December Complete testing of WRF sensitivity to land surface schemes (USGS, NLCD, MODIS) and snow cover options. On track to meet testing to 3 land surface schemes (see later slides). March Complete testing of WRF sensitivity to PBL and cloud microphysics parameterization schemes April Assess whether any air pollution events should be examined. July Complete testing of large-eddy simulations October Complete summary of types of cold air pools from modeling perspective and appropriate WRF model setup for the different types

USGS  higher albedo USGS  colder temps Recent Research: WRF CAP Sensitivity to Land Use 9 Day Average 2-m Temperature Difference USGS minus MODIS

Uinta Mountains Wasatch Range Tavaputs Desolation Canyon Plateau WY CO UT Roosevelt Myton Ouray Horsepool Red Wash Vernal Recent Research: WRF CAP Sensitivity to Initialization Time Identical simulations started 1 day apart

Initialization 2 Initialization 1 31 December January January 2011 WRF CAP Sensitivity to Initialization Time Identical simulations started 1 day apart Obs 31 Dec 1 Jan Recent Research: WRF CAP Sensitivity to Initialization Time Identical simulations started 1 day apart 1 Jan

Past and Future Work: Improving WRF Snow Cover Parameterization -Idealized snow cover -Snow albedo changes -Edited VEGPARM.TBL Allows model to achieve high albedos measured in Uintah Basin 9 Snow Depth

Albedo Changes 10 OriginalModified is average albedo measured at Horsepool during 2013 Uintah Basin Winter Ozone Study

Past and Future Work: WRF Cloud and Fog Modifications -Microphysics modifications (Thompson) in lowest 15 model layers (~500m): -Turned off cloud ice sedimentation -Turned off cloud ice autoconversion to snow  Results in ice-phase dominated low clouds/fog vs. liquid-phase Simulated Clouds Reality _l.jpg Photo: Erik Crosman Cloud Ice Cloud Water Before After 11 Ice Fog

PBL: YSU ΔX = 1.33 kmLES: ΔX = km Wind Speed (m s -1 ) 2-m Temp (C) Great Salt Lake Salt Lake Valley Salt Lake Valley Great Salt Lake sltrib.com Toxic soup continues… Time to exercise!