17 Apr 2023
 | 17 Apr 2023
Status: this preprint is currently under review for the journal AMT.

Feasibility Analysis of Optimal THz bands for passive limb sounding of middle and upper atmospheric wind

Wenyu Wang, Jian Xu, and Zhenzhan Wang

Abstract. As of now, direct measurements of middle and upper atmospheric wind are still scarce, and the observation method is limited, especially for the upper stratosphere and lower mesosphere. A new method to derive line-of-sight wind from 30 to more than 120 km is proposed using a high-resolution Terahertz (THz) radiometer, which can fill the measurement gap between lidar and interferometer. Simulations from 0.1 THz to 5 THz for evaluating the feasibility of the spaceborne THz limb sounder are performed in this study. The results show that high-precision wind (better than 5 m s−1) can be obtained from 40 to 70 km by covering a cluster of strong O3 lines. By choosing strong O2 or H2O lines, the high-quality measurement can be extended to 105 km. The O atom (OI) lines can provide wind signals in the higher atmosphere. In addition, performance of different instrument parameters include resolution, bandwidth and measurement noise are analyzed and four different band combinations are suggested at last.

Wenyu Wang et al.

Status: open (until 01 Jul 2023)

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  • RC1: 'Comment on amt-2023-75', Anonymous Referee #1, 10 May 2023 reply

Wenyu Wang et al.

Wenyu Wang et al.


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Short summary
This article presents a study for feasibility analysis of atmospheric wind measurement using THz passive limb radiometer with high spectral resolution. The simulations show that line-of-sight wind from 40 to 120 km can be obtained better than 10 m s−1 (at most altitudes is better than 5 m s−1) by using the O3, O2, H2O, OI bands. This study will provide reference for future payload design, such as the Chinese THz atmospheric limb sounder (TALIS) .