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Diurnal Wind Variations in TexAQS-2

Diurnal Wind Variations in TexAQS-2. John W. Nielsen-Gammon and Andrew McNeel Texas A&M University. Diurnal (24-hour) Winds. Sea Breeze Cycle strongly affects ozone concentrations and locations in Houston

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Diurnal Wind Variations in TexAQS-2

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  1. Diurnal Wind Variations in TexAQS-2 John W. Nielsen-Gammon and Andrew McNeel Texas A&M University

  2. Diurnal (24-hour) Winds • Sea Breeze Cycle strongly affects ozone concentrations and locations in Houston • Nighttime transport strongly affects ventilation and intrastate-interstate pollution dispersion • Objective: use TexAQS-2 profiler network to characterize diurnal winds

  3. Technical Issues • Profiler winds are • Contaminated by other sources • Contaminated by migrating birds • Noisy • Approach: • Use QC’d winds (Sonoma Technology) • Use mostly complete days • Interpolate using linear and EOF methods

  4. TexAQS-2 Profiler Network Jayton Palestine Ledbetter

  5. La Porte (diurnal wind fraction)

  6. La Porte (Average W-E & N-S winds)

  7. La Porte u/v, Aug/Sep 2006 episode

  8. Huntsville u/v, Aug/Sep 2006 episode

  9. Longview u/v, Aug/Sep 2006 episode

  10. New Braunfels u/v, Aug-Sep 2006 episode

  11. Ledbetter u/v, Aug-Sep 2006 episode

  12. Brazos A-19 u/v, Aug-Sep 2006 episode

  13. Southerly Wind Maxima • Longview: 00-01 CDT, 300 m, 7 m/s • Huntsville: 22-00 CDT, 300 m, 6.5 m/s • La Porte: 19-22 CDT, 250 m, 3 m/s • Brazos A19: 00 CDT, <400 m, > 4 m/s

  14. La Porte u/v, Aug/Sep 2006 episode

  15. La Porte u/v, June 2006

  16. Longview u/v, June 2006

  17. Jayton u/v, June 2006

  18. Conclusions • Diurnal winds are caused by: • Sea breeze • Frictional decoupling • and enhanced by adverse shear • At night, they are almost invisible to the conventional observing network • Important in regional transport • Challenging to model

  19. La Porte (onshore & alongshore diurnal wind)

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