Articles | Volume 18, issue 14
https://doi.org/10.5194/amt-18-3585-2025
https://doi.org/10.5194/amt-18-3585-2025
Research article
 | 
31 Jul 2025
Research article |  | 31 Jul 2025

The Atmospheric Sounder Spectrometer by Infrared Spectral Technology (ASSIST): instrument design and signal processing

Vincent Michaud-Belleau, Michel Gaudreau, Jean Lacoursière, Éric Boisvert, Lalaina Ravelomanantsoa, David D. Turner, and Luc Rochette

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Cited articles

Adler, B., Wilczak, J. M., Bianco, L., Bariteau, L., Cox, C. J., de Boer, G., Djalalova, I. V., Gallagher, M. R., Intrieri, J. M., Meyers, T. P., Myers, T. A., Olson, J. B., Pezoa, S., Sedlar, J., Smith, E., Turner, D. D., and White, A. B.: Impact of Seasonal Snow-Cover Change on the Observed and Simulated State of the Atmospheric Boundary Layer in a High-Altitude Mountain Valley, Geophys. Res.-Atmos., 128, e2023JD038497, https://doi.org/10.1029/2023JD038497, 2023. a
Adler, B., Turner, D. D., Bianco, L., Djalalova, I. V., Myers, T., and Wilczak, J. M.: Improving solution availability and temporal consistency of an optimal-estimation physical retrieval for ground-based thermodynamic boundary layer profiling, Atmos. Meas. Tech., 17, 6603–6624, https://doi.org/10.5194/amt-17-6603-2024, 2024. a
Babar, S. and Weaver, J. H.: Optical constants of Cu, Ag, and Au revisited, Appl. Optics, 54, 477–481, https://doi.org/10.1364/AO.54.000477, 2015. a
Bianco, L., Adler, B., Bariteau, L., Djalalova, I. V., Myers, T., Pezoa, S., Turner, D. D., and Wilczak, J. M.: Sensitivity of thermodynamic profiles retrieved from ground-based microwave and infrared observations to additional input data from active remote sensing instruments and numerical weather prediction models, Atmos. Meas. Tech., 17, 3933–3948, https://doi.org/10.5194/amt-17-3933-2024, 2024. a
Buijs, H. L. and McKinnon, J.: Two-beam interferometer for Fourier transform spectroscopy with double pivot scanning mechanism, US7480055B2, 2009. a, b
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Short summary
The Atmospheric Sounder Spectrometer by Infrared Spectral Technology (ASSIST) is a commercially available ground-based infrared spectroradiometer. It is designed for automated and passive measurement of the thermal radiation emitted by the atmosphere, providing information about the vertical distribution of temperature and humidity, trace gases, clouds, and aerosols in the boundary layer. In this paper, we outline the key characteristics of the ASSIST hardware and signal processing algorithm that yields downwelling radiance spectra in near real-time.
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