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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Journal of the Korean Meteorological Society Vol.43 No.3
- 발행연도
- 2007.8
- 수록면
- 223 - 237 (15page)
이용수
초록· 키워드
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Upper Tropospheric Humidity (UTH), the mean relative humidity for the layer from 500 to 200 hPa, can be retrieved from data of the 6.7 μm water vapor channel of meteorological satellites. The present study aims to assess the validity of the UTH retrieval algorithm, which will be incorporated into the data processing system of Communication, Ocean and Meteorological Satellite (COMS), for the summer season in the East Asian region. We analyze the algorithm parameters and the coefficients for the water vapor channels of Geostationary Meteorological Satellite-5 (GMS-5) and Geostationary Operational Environmental Satellite-9 (GOES-9) using the European Centre for Medium-Range Weather Forecast (ECMWF) reanalysis data. The coefficients applicable to data of the COMS water vapor channel are also determined. As COMS is not operating yet, the brightness temperatures of GMS-5 and GOES-9 have been used for the validation of the algorithm. UTH values calculated from radiosonde profiles of upper-air stations in the region are compared with UTHs retrieved from collocated satellite data. When the ECMWF-based coefficients are used, the root-mean-square difference between the retrieved and the measured UTHs is about 5.3 and 7.5%, respectively, for GOES-9 and GMS-5. However, the retrieved UTHs from GMS-5 data tend to be larger than those of radiosonde data. It has been noticed that brightness temperatures of GMS-5 are different from those calculated by the radiative transfer model. Thus, we have determined the algorithm coefficients using GMS-5 data and UTHs of radiosonde profiles. This improves the performance of the algorithm considerably; the root-mean-square difference decreases to about 4.3%. The results suggest that determining the algorithm coefficients from satellite data and in situ measurements of UTH is a practical measure of the UTH algorithm, if brightness temperatures of the water vapor channel behave differently, like GMS-5, from those of theoretical calculations.
목차
Abstract
1. Introduction
2. Descriptions of the algorithm
3. Results and discussions
4. Summary and conclusions
Acknowledgement
REFERENCES
참고문헌 (20)
참고문헌 신청
1. [학술지(정기간행물)] - Breon F.-M / 1999 / Evidence of atmospheric contamination on the measurement of the spectral response of the GMS-5 water vapor channel 16 : 1851 ~ 1853
2. [학술지(정기간행물)] - Chevallier F / 2001 / Sampled databases of 60-level atmospheric profiles from the ECMWF analyses : 27 ~
3. [학술지(정기간행물)] - Courtier, P / 1998 / The ECMWF implementation of three dimensional variational assimilation (3D-Var). I: Formulation 124 : 1783 ~ 1808
4. [학술지(정기간행물)] - Ferrare R. A / 2004 / Characterization of upper troposphere water vapor measurements during AFWEX using LASE 21 : 1790 ~ 1808
5. [학술지(정기간행물)] - Geer A. J / 1999 / Spatial patterns of climate variability in upper-tropospheric water vapor radiances from satellite data and climate model simulations 12 : 1940 ~ 1955
2. [학술지(정기간행물)] - Chevallier F / 2001 / Sampled databases of 60-level atmospheric profiles from the ECMWF analyses : 27 ~
3. [학술지(정기간행물)] - Courtier, P / 1998 / The ECMWF implementation of three dimensional variational assimilation (3D-Var). I: Formulation 124 : 1783 ~ 1808
4. [학술지(정기간행물)] - Ferrare R. A / 2004 / Characterization of upper troposphere water vapor measurements during AFWEX using LASE 21 : 1790 ~ 1808
5. [학술지(정기간행물)] - Geer A. J / 1999 / Spatial patterns of climate variability in upper-tropospheric water vapor radiances from satellite data and climate model simulations 12 : 1940 ~ 1955
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UCI(KEPA) : I410-ECN-0101-2009-453-016241021