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Vertical diffusion in ERA-40

Vertical diffusion in ERA-40. Vertical diffusion in ERA-40. Dirk Olivié 12 November 2003. Overview. Vertical Diffusion Louis, Holtslag, ECMW6h K z –profile Radon distribution Comparison with measurements Ecmwf3h, Ecmwf6h Radon distribution Comparison with measurements.

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Vertical diffusion in ERA-40

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  1. Vertical diffusion in ERA-40 Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003

  2. Overview • Vertical Diffusion • Louis, Holtslag, ECMW6h • Kz –profile • Radon distribution • Comparison with measurements • Ecmwf3h, Ecmwf6h • Radon distribution • Comparison with measurements

  3. What it’s all about … Kz : diffusion coefficient [m2s-1] C : tracer concentration

  4. Overview diffusion data

  5. Louis – Holtslag – ECMWF6h • Kz profile • Global Radon distribution • Comparison with Radon measurement • daily cycle • correlation

  6. Kz : mean profile August 1993 Global mean Over land Louis Holtslag Ecmwf-6h

  7. Louis Holtslag Ecmwf-6h Kz : daily cycle 1h30 4h30 7h30 10h30 13h30 16h30 19h30 21h30

  8. Radon : Holtslag - Louis

  9. Radon : Ecmwf6h - Holtslag

  10. Radon : Ecmwf6h - Louis

  11. Louis Holtslag Ecmwf-6h Measurement Radon : Surface

  12. Louis Ecmwf-6h Measurement Holtslag No diffusion Radon : 1200 m

  13. Correlation : surface Louis Holtslag Ecmwf-6h Jan Mar May Jul Sep Nov

  14. Correlation : 1200 m Louis Holtslag Ecmwf-6h Jan Mar May Jul Sep Nov

  15. ECMWF3h-ECMWF6h • Global Radon distribution • Daily cycle • Correlation

  16. ECMWF3h-ECMWF6h

  17. Radon - Daily cycle - surface Louis Holtslag Ecmwf-6h Ecmwf-3h Measurement

  18. Radon - Daily cycle – 1200 m Louis Holtslag Ecmwf-6h Ecmwf-3h No diffusion Measurement

  19. Correlation surface Louis Holtslag Ecmwf-6h Ecmwf-3h No diffusion Jun Jul Aug

  20. Correlation : 1200 m Louis Holtslag Ecmwf-6h Ecmwf-3h No diffusion Jun Jul Aug

  21. Radon profile Louis Holtslag Ecmwf-6h Ecmwf-3h No diffusion

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