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An urban flux tower for atmospheric turbulence and trace gas flux studies

An urban flux tower for atmospheric turbulence and trace gas flux studies. Gunnar W. Schade , C . H. Park I . Boedeker Texas A&M University, College Station, TX. Site Description, I. Site Description , II land use (+winds). land cover. Hardy / Elysian Roads. Traffic Counts.

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An urban flux tower for atmospheric turbulence and trace gas flux studies

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  1. An urban flux tower for atmospheric turbulence and trace gas flux studies Gunnar W. Schade, C. H. Park I. Boedeker Texas A&M University, College Station, TX

  2. Site Description, I

  3. Site Description, IIland use (+winds) land cover

  4. Hardy / Elysian Roads

  5. Traffic Counts Hardy (south bound) Elysian (north bound) Quitman Road (east/west bound)

  6. How it looks like

  7. WS/WD aspirated T/RH Tower N PAR pyranometer net radiation Sonic Tower Measurement Setup w 60 m 50 m 40 m 20 m 13 m PC DL Wind data (10 Hz) 3/8’’ and 1/4“ OD PFA Tubes Relaxed Eddy Accumulation Base Building GC- FID EC CO2 H2O gradient Lag time ≈ 9 s slow: CO, NOx, O3

  8. Integral statistics example I

  9. Integral statistics example II

  10. no roughness sub-layer influence

  11. d and z0 distributions

  12. displacement height related to cumulative roughness element parameters

  13. site (in)homogeneities I

  14. site (in)homogeneities II

  15. site (in)homogeneities III

  16. site (in)homogeneities IV

  17. seasonality I winter summer

  18. seasonality II weekday weekend

  19. VOC flux

  20. VOC flux

  21. Summary • Operated from summers 2007 to 2009 • Results very similar to previous urban turbulence research • comfortable that site is well-suited for flux measurements • flux data is under renewed investigation • Obtained follow-up funding • will commence this summer • expand with particle flux measurements

  22. Acknowledgements Houston Yellow Cab Texas A&M University startup Texas Air Research Center Bernhard Rappenglück TCEQ

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