Operational Implementation of the ATOVS Processing Procedure in KMA and Its Validation

Myoung-Hwan AHN; Mee-Ja KIM; Chu-Yong CHUNG; Ae-Sook SUH

doi:10.1007/BF02690798

Impact Factor: 3.9

Volume 20 Issue 3

May 2003

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2003 > 20(3): 398-414

Operational Implementation of the ATOVS Processing Procedure in KMA and Its Validation

1.
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

doi: 10.1007/BF02690798

Abstract
References
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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 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.
- ATOVS Processing and validation,
- temperature and humidity profiles
References

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Manuscript History

Manuscript received: 10 May 2003

Manuscript revised: 10 May 2003

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Operational Implementation of the ATOVS Processing Procedure in KMA and Its Validation

1. 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

Manuscript received: 2003-05-10
Manuscript revised: 2003-05-10

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 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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