validation of noaa-16/atovs products from aapp/iapp packages in korea
DESCRIPTION
Validation of NOAA-16/ATOVS Products from AAPP/IAPP Packages in Korea. M.H. Ahn, M.J. Kim, J.Y. Chung, A.S. Suh, Hyo-Sang Chung Meteorological Research Institute/KMA [email protected]. ATOVS Processing. Raw HRPT. Decommutation. Navigation & Calibration. AAPP(EUMETSAT). AMSU mapping on HIRS. - PowerPoint PPT PresentationTRANSCRIPT
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Validation of NOAA-16/ATOVS Validation of NOAA-16/ATOVS
Products from AAPP/IAPP Products from AAPP/IAPP
Packages in KoreaPackages in Korea
Validation of NOAA-16/ATOVS Validation of NOAA-16/ATOVS
Products from AAPP/IAPP Products from AAPP/IAPP
Packages in KoreaPackages in Korea
M.H. Ahn, M.J. Kim, J.Y. Chung, A.S. Suh, Hyo-Sang ChungM.H. Ahn, M.J. Kim, J.Y. Chung, A.S. Suh, Hyo-Sang ChungMeteorological Research Institute/KMAMeteorological Research Institute/KMA
M.H. Ahn, M.J. Kim, J.Y. Chung, A.S. Suh, Hyo-Sang ChungM.H. Ahn, M.J. Kim, J.Y. Chung, A.S. Suh, Hyo-Sang ChungMeteorological Research Institute/KMAMeteorological Research Institute/KMA
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Raw HRPTRaw HRPT
DecommutationDecommutation
ATOVS ProcessingATOVS ProcessingATOVS ProcessingATOVS Processing
Navigation & CalibrationNavigation & Calibration
RetrievalRetrieval
AMSU mapping on HIRSAMSU mapping on HIRS
Pre-Cloud DetectionPre-Cloud Detection
Level 1d dataLevel 1d dataModel Data Model Data
(NCEP/AVN)(NCEP/AVN)
Radiosonde Data
Surface Observation
IAPP(SSEC)IAPP(SSEC)
AAPP(EUMETSAT)AAPP(EUMETSAT)
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ExampleExampleExampleExample
2001.7.14 850 hpa-T 2001.7.14 700 hpa-T
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ExampleExampleExampleExample
2001.7.14 18UTC 850 hpa-Td2001.7.14 18 UTC 700 hpa-Td
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Number of Retrieved ProfilesNumber of Retrieved ProfilesNumber of Retrieved ProfilesNumber of Retrieved Profiles
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ValidationValidationValidationValidation
• Stations : Generally, 00 and 12 UTC observation A few stations take observation at 06 and 18 UTC, also Total of 20 stations data including Osan of Korea are used
• To match the ATOVS retrieval altitude, the radiosonde data is interpolated to the ATOVS altitude
• To avoid frequent missing points at higher altitude, the comparisons are made for altitudes below 100 hpa
• Stations : Generally, 00 and 12 UTC observation A few stations take observation at 06 and 18 UTC, also Total of 20 stations data including Osan of Korea are used
• To match the ATOVS retrieval altitude, the radiosonde data is interpolated to the ATOVS altitude
• To avoid frequent missing points at higher altitude, the comparisons are made for altitudes below 100 hpa
Radiosonde Station (06, 18 UTC)Radiosonde Station (06, 18 UTC)
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ValidationValidationValidationValidation
• Estimate Bias and RMSE of ATOVS derived temperature and water vapor mixing ratio using the collocated radiosonde data
• Data : Period: 2001. 5. 4 ~ 2001. 12. 31 : Number of NOAA-16 Orbits received at KMA: 950 : Number of Collocated data: 455
• Products : Temperature, dew point temperature, TPW, O3
: CLW, IWP, Rain rate (Using NESDIS Algorithm)
• Temporal and Spatial Collocation : 3 hours & 1.0o
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Bias & RMSEBias & RMSEBias & RMSEBias & RMSE
CloudyCloudyClearClearAllAll
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Residual Time SeriesResidual Time SeriesResidual Time SeriesResidual Time Series
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Mixing RatioMixing RatioMixing RatioMixing Ratio
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Mixing RatioMixing RatioMixing RatioMixing Ratio
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First Guess vs. ATOVSFirst Guess vs. ATOVSFirst Guess vs. ATOVSFirst Guess vs. ATOVS
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First Guess vs. ATOVSFirst Guess vs. ATOVSFirst Guess vs. ATOVSFirst Guess vs. ATOVS
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SummarySummarySummarySummary
NOAA-16/ATOVS data has been processed using the AAPP/IA
PP packages since June, 2001 at KMA
Comparison of temperature between ATOVS retrieved and radio
sonde measured shows that bias is within ±1.0o C, better at the lowe
r altitude and RMSE is less than 1.5o C for most of altitudes.
The retrieved water vapor mixing ratio shows bias is less than 0.
5 g/kg with RMSE of about 1.5 g/kg at lower altitude.
There is no significant dependence of the error statistics for both
temperature and water vapor mixing ratio on time. No significant d
ependence of the error statistics with the location are shown either
(not shown)
NOAA-16/ATOVS data has been processed using the AAPP/IA
PP packages since June, 2001 at KMA
Comparison of temperature between ATOVS retrieved and radio
sonde measured shows that bias is within ±1.0o C, better at the lowe
r altitude and RMSE is less than 1.5o C for most of altitudes.
The retrieved water vapor mixing ratio shows bias is less than 0.
5 g/kg with RMSE of about 1.5 g/kg at lower altitude.
There is no significant dependence of the error statistics for both
temperature and water vapor mixing ratio on time. No significant d
ependence of the error statistics with the location are shown either
(not shown)
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Plans Plans Plans Plans
More and better auxiliary data is going to be used.
- Regional model products for the first guess
- Use of land/sea surface temperature
Update the bias correction for the regional optimization
- Especially for the water vapor channels
More and better auxiliary data is going to be used.
- Regional model products for the first guess
- Use of land/sea surface temperature
Update the bias correction for the regional optimization
- Especially for the water vapor channels