Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements
1
Department of Chemistry, University of Waterloo, 200 University West, Waterloo, ON N2L 3G1, Canada
2
Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Anu Dudhia
Atmosphere 2021, 12(6), 680; https://doi.org/10.3390/atmos12060680
Received: 26 April 2021
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Revised: 20 May 2021
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Accepted: 21 May 2021
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Published: 26 May 2021
(This article belongs to the Special Issue Developing Algorithms and Software Tools to Retrieve Atmospheric Composition)
Line-of-sight wind profiles are derived from Doppler shifts in infrared solar occultation measurements from the Atmospheric Chemistry Experiment Fourier transform spectrometers (ACE-FTS), the primary instrument on SCISAT, a satellite-based mission for monitoring the Earth’s atmosphere. Comparisons suggest a possible eastward bias from 20 m/s to 30 m/s in ACE-FTS results above 80 km relative to some datasets but no persistent bias relative to other datasets. For instruments operating in a limb geometry, looking through a wide range of altitudes, smearing of the Doppler effect along the line of sight can impact the measured signal, particularly for saturated absorption lines. Implications of Doppler effect smearing are investigated for forward model calculations and volume mixing ratio retrievals. Effects are generally small enough to be safely ignored, except for molecules having a large overhang in their volume mixing ratio profile, such as carbon monoxide.
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Keywords:
atmospheric winds; Doppler effect; remote sensing; solar occultation
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MDPI and ACS Style
Boone, C.D.; Steffen, J.; Crouse, J.; Bernath, P.F. Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements. Atmosphere 2021, 12, 680. https://doi.org/10.3390/atmos12060680
AMA Style
Boone CD, Steffen J, Crouse J, Bernath PF. Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements. Atmosphere. 2021; 12(6):680. https://doi.org/10.3390/atmos12060680
Chicago/Turabian StyleBoone, Chris D., Johnathan Steffen, Jeff Crouse, and Peter F. Bernath. 2021. "Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements" Atmosphere 12, no. 6: 680. https://doi.org/10.3390/atmos12060680
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