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

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Presentation transcript:

Characterizing the Boundary-Layer During the Uintah Basin Ozone Study John Horel Erik Crosman, Matt Lammers, Alex Jacques, Nola Lucke, John Lawson, Maggie Schoonover, Erik Neemann and 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 the SL Basin is a ‘tea cup’ then the Uintah Basin is ‘large kettle’ ‘Tea Cup’ Model

Characterizing the Boundary Layer During UBOS Boundary-layer height and the vertical structure profiles (2 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

University of Utah Observations Roosevelt South (Ceilometer; Sonic Anememeter and met station; periodic rawinsonde Fort Duschesne Uintah River High School (Ceilometer; periodic rawinsonde Mobile ozone and met (various transects throughout basin)

(Very) Preliminary Observations from January Uintah Basin Cold Air Pool Laser ceilometer profiles 1800 UTC Jan 26 Rawinsonde 23 and 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 the boundary layer while temperature inversion remains intact (due to clouds and infrared radiative warming of boundary-layer, differential warming aloft, precipitation). End of cold air pool with frontal passage on Jan 28 th. Phase 1 Phase 2

Saturday January 26 th 1800 UTC Viasala Ceilometer Backscatter (Red high backscatter) 1000 m 500 m 0 m Waves and Changes in height of primary polluted 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

Boundary-Layer Evolution Noon-6 pm Top 200 m of inversion less polluted on 24 Jan than on 20 Jan Concentrated surface layer 150 m deeper on 24 Jan than on 20 Jan 20 Jan Jan 2013

Mobile Ozone/Met Observations 25 January Ozone (ppb) Temp (⁰C) ozone high ~145 ppb ozone low ~80 ppb

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