Validation of the H01,H02 & H03 products over Turkey İbrahim SÖNMEZ1, Ahmet ÖZTOPAL2, 1Turkish State Meteorological Service, Turkey 2Istanbul Technical University, Turkey
Content Ground observation Network Validation metedology Scatter & pdf plots Validation statistics Results Discussion
Ground Observation Netwok Sites : AWOS (Automated Weather Observation Station)
Ground Observation Netwok Sites : AWOS (Automated Weather Observation Station) Observed at every 1 minute: Precipitation Temperature Relative humidity Wind speed & direction Observed at every 10 minute: Pressure Soil temperature at different depths Evaporation
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) 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 5
Validation Methodology FOV for H02 AMSU(H02) product FOV centers 20090201 @ 00:28
Validation Methodology AMSU(H02) product FOV centers [20090201 @ 00:28] * : awos + : product
Validation Methodology AMSU(H02) product FOV centers [20090201 @ 00:28] * : awos + : FOV center
Validation Methodology Observation Product * : awos + : FOV center point area How to compare these two? Either, Or,
Validation Methodology * : awos + : FOV center
Validation Methodology ? W(r) determined by PCSV (Sen,1996): The observations are used rather than theorotical functions, such as Cressman or Barnes. * : awos + : FOV center
Validation Results – Scatter Plots(H01)
Validation Results – Scatter Plots(H01)
Validation Results – Scatter Plots(H02)
Validation Results – Scatter Plots(H03)
Validation Results – pdf Plots
Validation Results – Correlation variation
Validation Results – Std variation
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
Summary & Conclusions H03 : underestimation is dominant H03 : no significant difference over land & cost HO3 : relatively lower RR are observed respect to H01 & H02 product
Summary & Conclusions JFM period : highest correlation @ H02 among three products AMJ period :highest correlation @ H01 among three products H02& H03: Higher correlation occured in winter. Decreasing std trend through summer months is observed for H01&H02 Increasing std trend through summer months is observed for H03 Highest std in winter months is observed in H01 while H03 has the highest amount in summer time.
Questions & Comments