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Long-range transport of ozone from the Los Angeles Basin: A case study

Long-range transport of ozone from the Los Angeles Basin: A case study. A.O. Langford 1 , C. J. Senff 2 , R.J Alvarez 1 II, R. M. Banta 1 , R.M. Hardesty 1 1 Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA

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Long-range transport of ozone from the Los Angeles Basin: A case study

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  1. Long-range transport of ozone from the Los Angeles Basin: A case study A.O. Langford1, C. J. Senff2, R.J Alvarez1 II, R. M. Banta1, R.M. Hardesty1 1Chemical Sciences Division,Earth System Research Laboratory, NOAA, Boulder, Colorado, USA 2Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, and Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA

  2. Pre-CalNex flights coincided with highest ozone in SCAB during all of 2009 27 of 31 days in July exceeded NAAQS in South Coast Air Basin

  3. 2009 High ozone episode15 July: 1-hr 116 ppbv 8-hr 100 ppbv

  4. 2009 High ozone episode16 July: 1-hr 124 ppbv 8-hr 90 ppbv

  5. 2009 High ozone episode17 July: 1-hr 149 ppbv 8-hr 111 ppbv

  6. 2009 High ozone episode18 July: 1-hr 150 ppbv 8-hr 128 ppbv* * 2009 high value

  7. 2009 High ozone episode19 July: 1-hr 146 ppbv 8-hr 110 ppbv

  8. 2009 High ozone episode20 July: 1-hr 115 ppbv 8-hr 83 ppbv

  9. San Gabriel Mountains from Pomona CA (1910)

  10. Twin Otter over San Gabriel Mountains on 17 July 2009

  11. Flight track 17 July 2009

  12. TOPAZ Aerosol 17 July

  13. TOPAZ Ozone 17 July

  14. TOPAZ Ozone 17 July

  15. TOPAZ Ozone 17 July 2009

  16. UCLA SMOG Model 27 Aug 1987 SCAQSLu and Turco 1996

  17. UCLA SMOG ModelLu, Turco, and Jacobson 1994-1996 Integrated model with: • Mesoscale meteorology • Boundary layer physics • Tracer advection • Convection and diffusion • Photochemistry • Aerosol microphysics and chemistry • Solar and terrestrial radiative transfer

  18. UCLA SMOG ModelLu, Turco, and Jacobson 1994-1996 • 85 x 55 grid cell meteorological domain • 51 x 31 grid cell tracer chemistry domain • Horizontal resolution ~0.05° (~5 km) • 20 non-uniform vertical layers

  19. Synoptic Background 00 UT 18 July 2009 00 UT 27 August 1987 1000 hPa

  20. Synoptic Background 00 UT 18 July 2009 00 UT 27 August 1987 700 hPa

  21. Where does the ozone go?48 h HYSPLIT forward trajectories

  22. Where does the ozone go?48 h HYSPLIT forward trajectories

  23. Where does the ozone go?48 h HYSPLIT forward trajectories 24 hours later

  24. Where does the ozone go?48 h HYSPLIT forward trajectories 48 hours later

  25. Where does the ozone go?48 h HYSPLIT backward trajectories

  26. Where does the ozone go?48 h HYSPLIT forward trajectories

  27. How often does this occur? What about 19 July 2009

  28. Flight track 19 July 2009

  29. TOPAZ Aerosol 19 July

  30. TOPAZ Ozone 19 July

  31. Synoptic Background 00 UT 18 July 2009 00 UT 20 July 2009 1000 hPa

  32. Synoptic Background 00 UT 18 July 2009 00 UT 20 July 2009 700 hPa

  33. Questions for CalNex • What conditions are needed for “Mountain Chimney Effect”? • What conditions favor long range transport from the Los Angeles Basin? • How well can WRF/Chem reproduce these observations?

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