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Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals
Alternative TitleWOS:000515393800127;20201008275125
Wang, Wenyu1; Wang, Zhenzhan; Duan, Yongqiang1
Source PublicationREMOTE SENSING
2020
Volume12Issue:3Pages:468
DOI10.3390/rs12030468
Language英语
KeywordTALIS THz atmospheric limb sounding error budget retrievals MICROWAVE LIMB SOUNDER UPPER TROPOSPHERE EOS MLS CALIBRATION ATMOSPHERE RADIOMETER SATELLITE PERFORMANCE ALGORITHMS SIMULATION
AbstractThe THz Atmospheric Limb Sounder (TALIS) is a Chinese sub-millimeter limb sounder being designed by National Space Science Center of the Chinese Academy of Sciences to measure the temperature and chemical constituents vertically in the middle and upper atmosphere, with good precision and vertical resolution. This paper presents a simulation study that assesses the measurement errors and their impacts on the retrievals. Three error sources, including instrument uncertainties, calibration errors and a priori errors, are considered. The sideband weight uncertainty, the local oscillator, the pointing angle offsets and the measurement noise (NEDT), are considered as instrument uncertainties. Calibration errors consist of the hot target offset, the nonlinearity residual of the two-point calibration, use of the Rayleigh-Jeans (R-J) approximation and the choice of the antenna pattern. A priori profile errors of temperature, pressure and species are also considered. The results suggest that the antenna pattern mainly affects the retrievals in the troposphere. The NEDT is a major error source affecting all of the retrievals. The R-J approximation has a great impact upon the retrievals at 643 GHz, and should not be used. The local oscillator offset leads to an obvious error above 50 km. The effect of nonlinearity residuals cannot be neglected above 70 km. The impact of the sideband weight uncertainty and the hot target offset are relatively small. The pointing and the a priori errors can be neglected in most observation regions.
Indexed BySCI ; EI
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7705
Collection中国科学院国家空间科学中心
Affiliation1.Chinese Acad Sci, Natl Space Sci Ctr, Key Lab Microwave Remote Sensing, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100094, Peoples R China
Recommended Citation
GB/T 7714
Wang, Wenyu,Wang, Zhenzhan,Duan, Yongqiang. Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals[J]. REMOTE SENSING,2020,12(3):468.
APA Wang, Wenyu,Wang, Zhenzhan,&Duan, Yongqiang.(2020).Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals.REMOTE SENSING,12(3),468.
MLA Wang, Wenyu,et al."Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals".REMOTE SENSING 12.3(2020):468.
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