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BLLAST Uniform processing of EC data Olivier De Coster & Henk - PowerPoint PPT Presentation

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BLLAST Uniform processing of EC data Olivier De Coster & Henk Pietersen Supervised by F. Lohou, O. Hartogensis & A. Moene Content INTERNSHIP Experimental Set-up EC-stations Data Processing Scintillometer Analysis THESIS

  2. BLLAST Uniform processing of EC data Olivier De Coster & Henk Pietersen Supervised by F. Lohou, O. Hartogensis & A. Moene

  3. Content INTERNSHIP • Experimental Set-up EC-stations • Data Processing • Scintillometer Analysis THESIS

  4. INTERNSHIP • Experimental Set-up EC-stations • Data Processing • Scintillometer Analysis THESIS

  5. Super Site 1 Valimev tower Overview Laboratoire d’Aérologie MicroSite (20 Hz) • 2m: CSAT & LICOR Valimev tower (10 Hz) • 30m: CSAT & LICOR SkinFlow • 45m: Gill • 60m: CSAT & Krypton Valimev MicroSite SkinFlow mast (20 Hz) • 0.9,1.1m: Kaijo Denki & SkinFlow mast T-couple University of Utah & • 2,3,5,8m: CSAT & T-couple Wageningen University MicroSite University of Bergen

  6. Super Site 2 Forest mast Overview University of Utah & Wageningen University Forest mast (10 Hz) • 20m: CSAT & T-couple • 30m: CSAT & LICOR Corn (20 Hz) • 5m: CSAT & LICOR Moor (20 Hz) • 3m: CSAT & LICOR Forest Moor Météo-France Corn Corn Météo-France Moor

  7. Edge Site Wheat University of Bonn EDGE SITE Grass (20 Hz) • 2½m: CSAT & LICOR Edge (20 Hz) • 2½m: CSAT & LICOR Wheat (20 Hz) • 3m: CSAT & LICOR Grass Forschungszentrum Edge Jülich & Bonn University Wageningen University

  8. INTERNSHIP • Experimental Set-up EC-stations • Data Processing • Scintillometer Analysis THESIS

  9. Processing STEP 1: www.met.wau.nl/ Organizing projects/csi2ncdf/index.htm Raw Data l STEP 2: Rotation Correction www.met.wau.nl/ STEP 3: projects/jep/index.html Flux Calculation

  10. STEP 1: Organizing Raw Data • Original raw data formats: – Binary (TOB1,2,3) and ASCII (TOA5, text) • Output: raw data in uniform and daily NetCDF files per EC-station • NetCDF variable names: YYYY, DOY, HHMM, sec, u, v, w, T_sonic,... • File naming: BLLAST_SiteName_EC-station_Y2011DOY165.nc

  11. NetCDF files locations • Locations BLLAST database: Small scale Ground 60m Tower heterogeneity Station site Divergence site (SkinFlow) Forest site Edge Site Meteorological parameters Surface energy balance Micrometeo stations corn site 2 parameters Surface energy balance stations moor site 2

  12. STEP 2: Rotation Correction • Planar fit method Angles calculated over chosen period • BLLAST: calculate angles first and last week, check difference Small: Large: Use full Use weekly BLLAST period periods

  13. STEP 3: Flux Calculation PROCES COMMENTS Block averaging Averaging 5, 10, 30 minutes Planar fit (Wilczack et al., Rotation 2001) Mean(V) � 0 yes Time-lag yes/no Despiking no Rejection non-physical values yes Poor frequency response yes (Moore, 1986) Webb correction yes (Webb et al., 1980) O 2 correction Krypton yes (Tanner et al., 1993) Sonic T correction yes (Schotanus et al., 1983)

  14. Flux Output • Flux text files containing: – No. of samples – Means, standard deviations & covariances – Structure parameters – Derived physical quantities (fluxes) – Tolerance intervals • Flux files also available in NetCDF

  15. Sensible Heat Flux – IOP 9

  16. Latent Heat and CO 2 Flux – IOP 9

  17. Composite Day – Edge

  18. Composite Day – Valimev 60m

  19. INTERNSHIP • Experimental Set-up EC-stations • Data Processing • Scintillometer Analysis THESIS

  20. Thesis - scintillometry • LAS data � calculate H using a single height • Challenge: slant path and topography • Effective height concept � 3D • Flux footprint: wind, stability, terrain

  21. Questions?

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