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Diurnal Wind Variations in TexAQS-2

This study investigates diurnal wind patterns in Houston during the TexAQS-2 campaign, focusing on how the sea breeze cycle influences ozone concentrations and locations. Nighttime wind transport significantly affects pollution dispersion, complicating the understanding of air quality. Utilizing the TexAQS-2 profiler network, researchers characterized these winds, overcoming challenges from various contamination sources. Analysis of wind data from multiple locations, particularly La Porte, provides insights into diurnal wind dynamics crucial for regional air quality modeling and management.

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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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