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Article

Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals

1
Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(3), 468; https://doi.org/10.3390/rs12030468
Received: 10 December 2019 / Revised: 27 January 2020 / Accepted: 29 January 2020 / Published: 2 February 2020
(This article belongs to the Special Issue Remote Sensing of Atmospheric Components and Water Vapor)
The 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. View Full-Text
Keywords: TALIS; THz atmospheric limb sounding; error budget; retrievals TALIS; THz atmospheric limb sounding; error budget; retrievals
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MDPI and ACS Style

Wang, W.; Wang, Z.; Duan, Y. Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals. Remote Sens. 2020, 12, 468. https://doi.org/10.3390/rs12030468

AMA Style

Wang W, Wang Z, Duan Y. Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals. Remote Sensing. 2020; 12(3):468. https://doi.org/10.3390/rs12030468

Chicago/Turabian Style

Wang, Wenyu, Zhenzhan Wang, and Yongqiang Duan. 2020. "Preliminary Evaluation of the Error Budgets in the TALIS Measurements and Their Impact on the Retrievals" Remote Sensing 12, no. 3: 468. https://doi.org/10.3390/rs12030468

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