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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

Diurnal Wind Variations in TexAQS-2

John W. Nielsen-Gammon and Andrew McNeel

Texas A&M University

diurnal 24 hour winds
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
technical issues
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
texaqs 2 profiler network
TexAQS-2 Profiler Network

Jayton

Palestine

Ledbetter

southerly wind maxima
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
conclusions
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