| Operational Implementation of the ATOVS Processing Procedure in KMA and Its Validation |
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| 作者姓名： | Myoung-Hwan AHN Mee-Ja KIM Chu-Yong CHUNG Ae-Sook SUH |
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| 作者单位： | RemoteSensingResearchLaboratory/MeteorologicalResearchInstitute,Seoul156-720,Korea |
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| 基金项目： | the project“Development of Monitoring and，Prediction Technology for Severe Weather(Heavy Rainfall)
over the Korean Peninsula”of the Korea Meteorological
Administration. |
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| 摘 要： | The Korea Meteorological Administration (KMA) has processed the data from the advanced TOVS(ATOVS) onboard NOAA-16 satellite since May 2001. The operational production utilizes the AAPP(ATOVS and AVHRR Processing Package) of EUMETSAT and IAPP (International ATOVS ProcessingPackage) of the University of Wisconsin. For the initial guess profiles, the predicted fields (usually 6 to 12hour forecasted fields) from the global aviation model of NOAA/NCEP are used. The average number ofprofiles retrieved from the ATOVS data is about 1,300 for each morning and afternoon orbit at about 18 and06 UTC, respectively. The retrieved temperature and dew point temperatures are provided to forecastersin real time and used for initialization of prediction models. With the advanced microwave sensor (AMSU;Advanced Microwave Sounding Unit), accuracy of the ATOVS products is expected to be better than thatof the TOVS products, especially in cloudy conditions. Indeed, the preliminary results from a validationstudy with the collocated radiosonde data during a 8-month period, from May to December 2001, for theEast Asia region show an improved accuracy of the ATOVS products for cloudy skies versus the TOVS,especially for higher altitudes. The RMS (Root Mean Square) difference between the ATOVS productsand radiosonde data is about 1.3℃ for both clear and cloudy conditions, except for near the ground and athigher altitudes, at around 200 hPa. There is no significant temporal variation of the error statistics at allpressure levels. In case of the water vapor mixing ratio, the largest difference is shown at lower altitudes,while the accuracy is much better for the clear sky cases than the cloudy sky cases. The bias and RMSEat lower altitudes is about 0.557 g kg-1 and 2.5 g kg-1 and decrease significantly with increasing altitude.
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| 关 键 词： | ATOVS KMA 气象分析 温度 湿度 气候资料 统计分析 |
| 收稿时间： | 8 June 2002 |
Operational implementation of the ATOVS processing procedure in KMA and its validation |
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| Myoung-Hwan AHN,Mee-Ja KIM,Chu-Yong CHUNG,Ae-Sook SUH.Operational Implementation of the ATOVS Processing Procedure in KMA and Its Validation[J].Advances in Atmospheric Sciences,2003,20(3):398-414. |
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| Authors: | Myoung-Hwan Ahn Mee-Ja Kim Chu-Yong Chung Ae-Sook Suh |
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| Institution: | Remote Sensing Research Laboratory/Meteorological Research Institute, Seoul 156-720, Korea,Remote Sensing Research Laboratory/Meteorological Research Institute, Seoul 156-720, Korea,Remote Sensing Research Laboratory/Meteorological Research Institute, Seoul 156-720, Korea,Remote Sensing Research Laboratory/Meteorological Research Institute, Seoul 156-720, Korea |
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| Abstract: | The Korea Meteorological Administration (KMA) has processed the data from the advanced TOVS (ATOVS) onboard NOAA-16 satellite
since May 2001. The operational production utilizes the AAPP (ATOVS and AVHRR Processing Package) of EUMETSAT and IAPP (International
ATOVS Processing Package) of the University of Wisconsin. For the initial guess profiles, the predicted fields (usually 6
to 12 hour forecasted fields) from the global aviation model of NOAA/NCEP are used. The average number of profiles retrieved
from the ATOVS data is about 1,300 for each morning and afternoon orbit at about 18 and 06 UTC, respectively. The retrieved
temperature and dew point temperatures are provided to forecasters in real time and used for initialization of prediction
models. With the advanced microwave sensor (AMSU; Advanced Microwave Sounding Unit), accuracy of the ATOVS products is expected
to be better than that of the TOVS products, especially in cloudy conditions. Indeed, the preliminary results from a validation
study with the collocated radiosonde data during a 8-month period, from May to December 2001, for the East Asia region show
an improved accuracy of the ATOVS products for cloudy skies versus the TOVS, especially for higher altitudes. The RMS (Root
Mean Square) difference between the ATOVS products and radiosonde data is about 1.3°C for both clear and cloudy conditions,
except for near the ground and at higher altitudes, at around 200 hPa. There is no significant temporal variation of the error
statistics at all pressure levels. In case of the water vapor mixing ratio, the largest difference is shown at lower altitudes,
while the accuracy is much better for the clear sky cases than the cloudy sky cases. The bias and RMSE at lower altitudes
is about 0.557 g kg−1 and 2.5 g kg−1 and decrease significantly with increasing altitude. |
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| Keywords: | ATOVS Processing and validation temperature and humidity profiles |
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