Characterizing the Boundary-Layer During the Uintah Basin Ozone Study Erik Crosman John Horel Others: Matt Lammers, Alex Jacques, Nola Lucke, John Lawson,

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Presentation transcript:

Characterizing the Boundary-Layer During the Uintah Basin Ozone Study Erik Crosman John Horel Others: Matt Lammers, Alex Jacques, Nola Lucke, John Lawson, Maggie Schoonover, Erik Neemann, Joe Young University of Utah Department of Atmospheric Sciences

200 km 140 km 45 km 20 km UINTAH BASIN SALT LAKE ‘BASIN’ 65 km LOS ANGELES BASIN 20 km New territory: If SL Basin is a ‘tea cup’ then Uintah Basin is a ‘large kettle’ ‘Tea Cup’ Model Lareau et al. (Jan 2013 BAMS)

Characterizing the Boundary Layer During UBOS Boundary-layer height and vertical profiles (ceilometers, rawinsondes) Near-surface turbulence (sonic anemometer) Spatial variations in BL (WRF model simulations, MesoWest, UU2DVAR, mobile ozone and met obs) CS Sonic Anemometer Mobile Ozone/Met WRF near-surface temp (left) and terrain (right) 12 UTC Feb Viasala CL31 ceilometer

(Very) Preliminary Observations from January Uintah Basin Cold Air Pool Laser ceilometer profiles 1800 UTC Jan 26 Rawinsonde 25 Jan mobile ozone/met

Cold Air Pool Boundary-Layer Evolution Phase 1: Jan: Persistent cold air pool in place in basin with only slight warming of boundary layer through period Phase 2: Jan: Dramatic warming of boundary layer while temperature inversion remains intact (due to clouds and infrared radiative warming of boundary- layer, differential warming aloft, precipitation late) End of cold air pool with frontal passage on Jan 28 th Phase 1Phase 2

Saturday January 26 th 1800 UTC Viasala Ceilometer Backscatter (Orange/Red high backscatter) 1000 m 500 m 0 m Waves & changes in height of primary aerosol layer 26 Jan 11 am MST Rawinsonde 6 am MST 26 Jan 11 am MST 9 am MST ‘Layering’ in aerosol backscatter corresponds to distinct temperature layers in the boundary layer

1000 m 500 m 0 m AGL 1000 m 500 m 0 m AGL Contrasting Boundary Layers Noon-6 pm Phase 1: 19 Jan High aerosol concentrations in shallow layer with thin aerosol layers above 24 Jan 2013 Phase 2: 25 Jan Higher aerosol concentrations in deeper layer with clouds above

Mobile Ozone/Met Observations 25 January Mobile consistent with measurements at fixed sites Interactive display Roosevelt Vernal Horsepool Ozone (ppb) Myton nr Horsepool Vernal Roosevelt

UU UBOS Webpage: Ceilometers/Sonic Anemometer/Rawinsonde/mobile data available under ‘observations’