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Validation of the H01,H02 & H03 products over Turkey

Validation of the H01,H02 & H03 products over Turkey. İbrahim SÖNMEZ 1 , Ahmet ÖZTOPAL 2 , 1 Turkish State Meteorological Service, Turkey 2 Istanbul Technical University, Turkey. Ground observation Network Validation metedology Scatter & pdf plots Validation statistics Results

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Validation of the H01,H02 & H03 products over Turkey

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  1. Validation of the H01,H02 & H03 products over Turkey İbrahim SÖNMEZ1, Ahmet ÖZTOPAL2, 1Turkish State Meteorological Service, Turkey 2Istanbul Technical University, Turkey

  2. Ground observation Network Validation metedology Scatter & pdf plots Validation statistics Results Discussion Content

  3. Ground Observation Netwok Sites : AWOS (Automated Weather ObservationStation)

  4. Ground Observation Netwok Sites : AWOS (Automated Weather ObservationStation) • Observed at every 1 minute: • Precipitation • Temperature • Relative humidity • Wind speed & direction • Observed at every 10 minute: • Pressure • Soil temperature at different depths • Evaporation

  5. Flag Value Status Brief Description 0 Good Datum has passed all QA Test 1 Suspect There is concern about accuracy of datum 2 Warning Datum is very questionable 3 Failure Datum is unstable RG Quality Control Procedures • Tests applied to the precipitation data: • Range Test (climatological comparison) • Step Test (sequential observation comparison) • Persistance Test (group of observation comparison)

  6. Validation Methodology FOV for H02 AMSU(H02) product FOV centers 20090201 @ 00:28

  7. Validation Methodology AMSU(H02) product FOV centers [20090201 @ 00:28] * : awos + : product

  8. Validation Methodology AMSU(H02) product FOV centers [20090201 @ 00:28] * : awos + : FOV center

  9. Either, Or, Validation Methodology • Observation Product * : awos + : FOV center point area How to compare these two?

  10. Validation Methodology * : awos + : FOV center

  11. ? • W(r) determined by PCSV (Sen,1996): • The observations are used rather than theorotical functions, such as Cressman or Barnes. Validation Methodology * : awos + : FOV center

  12. Validation Results – Scatter Plots(H01)

  13. Validation Results – Scatter Plots(H01)

  14. Validation Results – Scatter Plots(H02)

  15. Validation Results – Scatter Plots(H03)

  16. Validation Results – pdf Plots

  17. Validation Results – Correlation variation

  18. Validation Results – Std variation

  19. Summary & Conclusions • H01 :overestimation is dominant • H01 : Relatively lower RR are observed over cost than land • H02 :overestimation is dominant • H02 : RR over cost ~= RR over land • H02 :increasing RR amounts through summer is observed • RR amount of H02 < RR amount of H01 for a particular month

  20. Summary & Conclusions • H03 :underestimation is dominant • H03 : no significant difference over land & cost • HO3 : relatively lower RR are observed respect to H01 & H02 product

  21. Summary & Conclusions • JFM period : highest correlation @ H02 among three products • AMJ period :highest correlation @ H01 among three products • H02& H03: Highercorrelation occured in winter. • Decreasingstd trend through summer months is observed for H01&H02 • Increasingstd trend through summer months is observed for H03 • Higheststd in winter months is observed in H01 while H03 has the highest amount in summer time.

  22. Questions & Comments

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