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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-76
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Apr 2018

Research article | 04 Apr 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.

Simulation study for the Stratospheric Inferred Winds (SIW) sub-millimeter limb sounder

Philippe Baron1, Donal Murtagh2, Patrick Eriksson2, Jana Mendrok2,a, Satoshi Ochiai1, Kristell Pérot2, Hideo Sagawa3, and Makoto Suzuki4 Philippe Baron et al.
  • 1National Institute of Information and Communications Technology, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan
  • 2Department of Space, Earth and Environment, Chalmers University of Technology, 41296 Göteborg, Sweden
  • 3Kyoto Sangyo University, Kyoto, Japan
  • 4Japan Aerospace Exploration Agency, Tsukuba, 305-8505 Japan
  • aformerly at: Chalmers University of Technology until Dec. 2017

Abstract. Stratospheric Inferred Winds (SIW) is a Swedish mini sub-millimeter limb sounder selected for the 2nd InnoSat platform launch planned near 2022. It is intended to fill the altitude gap between 30–70km in atmospheric wind measurements and also aims at pursuing the limb observations of temperature and key atmospheric constituents between 10–90km when current satellite missions are probably stopped. Line-of-sight winds are retrieved from the Doppler shift of the emission lines introduced by 5 the wind field. Observations will be performed with two antennas pointing toward the limb with perpendicular directions to reconstruct the 2-D horizontal wind vector. Each antenna has a vertical field of view of 5km. The chosen spectral band near 655GHz contains a dense group of strong O3 lines suitable for exploiting the small wind information in stratospheric spectra. Using both sidebands of the heterodyne receiver, a large number of chemical species will be measured including O3-isopotologues, H2O, HDO, HCl, ClO, N2O, HNO3, NO, NO2, HCN, CH3CN and HO2. This paper presents the simulation study for assessing the measurement performances. The line-of-sight winds are retrieved between 30–90km with the best sensitivity between 35–70km where the precision (1-sigma) is 5–10ms−1 for a single scan. Similar performances can be obtained during day and night conditions except in the lower mesosphere where the photo-dissociation of O3 in day-time reduces the sensitivity by 50% near 70km. Profiles of O3, H2O and temperature are retrieved with a high precision up to 50km (<1%, <2%, 1K, respectively). Systematic errors due to uncertainties on spectroscopic parameters, on the radiometer sideband ratio and in the radiance calibration process are investigated. A large wind retrieval bias of 10–30ms−1 between 30–40km can be induced by the air-broadening parameters uncertainties of O3 lines. This highlights the need for a good knowledge of these parameters and to study methods to mitigate the retrieval bias.

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Philippe Baron et al.
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This paper investigates with computer simulations the measurement performances of the satellite Stratospheric Inferred Winds (SIW) for middle atmosphere observations (altitudes between 10 and 90 km). It is a Swedish mission that will be launch near 2022. It is intended to fill the current altitude gap between 30 and 70 km in wind measurements. It also aims at pursuing the monitoring of temperature and key atmospheric constituents such as the ozone chemistry related species.
This paper investigates with computer simulations the measurement performances of the satellite...
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