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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-212
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-212
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Jul 2019

Submitted as: research article | 12 Jul 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Performance Evaluation of THz Atmospheric Limb Sounder (TALIS) of China

Wenyu Wang1,2, Zhenzhan Wang1, and Yongqiang Duan1,2 Wenyu Wang et al.
  • 1Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing, China
  • 2University of Chinese Academy of Sciences, Beijing, China

Abstract. THz Atmospheric Limb Sounder (TALIS) is a microwave limb sounder being developed for atmospheric high precision observation by the National Space Science Center, Chinese Academy of Sciences (NSSC, CAS). It is designed to measure the temperature and chemical species such as O3, HCl, ClO, N2O, NO, NO2, HOCl, H2O, HNO3, HCN, CO, SO2, BrO, HO2, H2CO, CH3Cl, CH3OH, and CH3CN with high vertical resolution from surface to about 100 km to improve our comprehension of atmospheric chemistry and dynamics, and to monitor the man-made pollution in the atmosphere. Four heterodyne radiometers including several FFT spectrometers of 2 GHz bandwidth with 2 MHz resolution are employed to obtain the atmospheric thermal emission in broad spectral regions centred near 118, 190, 240, and 643 GHz. A theoretical simulation is performed to estimate the retrieval precision of the main targets. Single scan measurement and averaged measurement are considered in simulation, respectively. Temperature profile can be obtained with the precision of < 2 K for a single scan from 15 to 85 km by using 118 GHz radiometer, and the 240 and 643 GHz radiometer can provide temperature information in the upper troposphere. Chemical species such as H2O, O3, HCl, N2O, and HNO3 show high single scan retrieval precision of 1–50 % at most altitudes. The other species should be retrieved by using averaged measurements because of the weak intensity or low abundance.

Wenyu Wang et al.
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Wenyu Wang et al.
Wenyu Wang et al.
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Short summary
THz Atmospheric Limb Sounder (TALIS) is a microwave limb sounder designed to measure the temperature and chemical species. The instrument will make an important contribution to monitoring the chemistry of the middle atmosphere. This paper describes the performance of this instrument. We use radiative transfer model to evaluate its performance. As a result, the retrieval precision is quite acceptable.
THz Atmospheric Limb Sounder (TALIS) is a microwave limb sounder designed to measure the...
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