C. J. Senff, R. J. Alvarez II, R. M. Hardesty, A. O. Langford, R. M. Banta, W. A. Brewer, F. Davies, S. P. Sandberg, R. D. Marchbanks, A. M. Weickmann.

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Presentation transcript:

C. J. Senff, R. J. Alvarez II, R. M. Hardesty, A. O. Langford, R. M. Banta, W. A. Brewer, F. Davies, S. P. Sandberg, R. D. Marchbanks, A. M. Weickmann CalNex Data Analysis Workshop 18 May 2011 Airborne lidar measurements of horizontal and vertical ozone transport in southern California during CalNex 2010

CalNex NOAA Twin Otter Optical remote sensing aircraft 19 May – 19 July, flights, 207 flight hours Twin Otter CalNex operating parameters: –Speed: ~ 60 m s -1 –Endurance: up to 4 hours –Flight altitude: ft MSL Sacramento 15 – 28 June Ontario 19 May – 14 June 29 June – 19 July

NOAA Twin Otter Instrumentation Primary instruments: –Downward-looking ozone and aerosol lidar (TOPAZ = Tunable Optical Profiler for Aerosols and oZone) –University of Leeds scanning Doppler wind lidar –Airborne Multi-Axes Differential Optical Absorption Spectroscopy (AMAX-DOAS) Instrument (R. Volkamer et al, CU Boulder) Additional instruments: –In situ O 3, temperature, pressure –Radiometers (surface temp, albedo)

TOPAZ Lidar (19 May – 19 July) Ozone & aerosol backscatter profiles Min / Max Range: 400 m / 3 – 5 km Resolution (O 3 ): Δx = 600 m, Δz = 90 m

Track 12.5 deg off nadir U of Leeds Doppler lidar (7 June – 18 July) Horizontal wind speed and direction profiles Vertical wind speed profiles Min / Max Range: 50 m / up to 3 km Resolution: Δx = 500 – 800 m, Δz = 50 m

NOAA Twin Otter CalNex Science Objectives Distribution of pollutants 3-dimensional distribution of ozone and aerosols over different regions of California Horizontal transport Flow of ozone and aerosol between different air basins in California Import and export of ozone into/out of California Vertical transport Topographic forcing (Mountain Chimney effect) Boundary layer detrainment Ozone layers aloft Stratospheric intrusions (Andy Langford, talk) Pollution layers transported from Asia (Andy Langford, poster) Air Quality model validation Synergies between AMAX-DOAS and LIDAR Constrain O x budget (O x = NO 2 + O 3 )

Regional Pollution in Southern California California Area Designations for 8-hour Ozone NAAQS

Pollution export pathways from the L A Basin Banning Pass San Gabriel Mtns Land-Sea breeze Newhall Pass Cajon Pass Mojave Desert San Bernardino Mtns Mountain Chimney Effect

Daily maximum 8-hour surface O 3 concentration Southern California: May 19 – July 19 Highest 8-h O 3 value in CA in 2010

Daily maximum 8-h O 3 concentration averaged for 5 June, 23 June, and 17 July 2010

NOAA Twin Otter CalNex flights in Southern California 2 July 2010

2 July 2010: O 3 distribution over L A Basin and Mojave Desert FL – MSL 14:06 – 17:47 PST

2 July 2010: Transport thru Banning Pass and along/over San Gabriel Mtns

Combination of lidar remote ozone and wind measurements allows to quantify horizontal ozone flux 2 July 2010: Transport thru Banning Pass

2 July 2010 Upslope transport along/over the San Gabriel Mtns Transport into Mojave Desert via Newhall Pass

2 July 2010: Transport to Western Mojave Desert via Newhall Pass / Santa Clarita Lancaster Soledad Canyon

Ozone, ppbv Horizontal wind speed, m/s 2 July 2010: Transport thru Banning Pass

2 July 2010: Orographic Lifting of O 3 ?

FLEXPART trajectories 01UT 3 July 2010 (3 km MSL) (Jerome Brioude)

Pre-CalNex: 17 July 2009 Langford et al, 2010: Long-range transport of ozone from the Los Angeles Basin: A case study, Geophys. Res. Lett., doi: /2010GL HYSPLIT forward trajectories

Summary & Outlook Characterized ozone export processes from the L A Basin using airborne lidar and surface ozone data Demonstrated capability to remotely measure ozone and horizontal wind speed/direction from an airborne platform Next steps: Retrieve fluxes and quantify ozone transport Expand analysis to include other regions in CA

Acknowledgement R. J. Alvarez, R. M. Hardesty, A. O. Langford, R. M. Banta, W. A. Brewer, F. Davies, S. P. Sandberg, R. D. Marchbanks, A. M. Weickmann, J. G. George NOAA Twin Otter flight crews & NOAA Aircraft Operations Center NOAA Health of the Atmosphere Program

Correlation between daily max. 8-h surface O 3 within and outside of South Coast Air Basin (SC) for 5/19 – 7/19/2010

Correlation between daily max. 8-h surf. O 3 at Mojave and Southern San Joaquin Valley (SSJV) or SC for 5/19 – 7/19/2010