Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements
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 s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Atmosphere |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4433/12/6/680 |
| _version_ | 1797532578981347328 |
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| author | Chris D. Boone Johnathan Steffen Jeff Crouse Peter F. Bernath |
| author_facet | Chris D. Boone Johnathan Steffen Jeff Crouse Peter F. Bernath |
| author_sort | Chris D. Boone |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T11:01:14Z |
| format | Article |
| id | doaj.art-274ae14cae384b94944a1fd582f4ad91 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T11:01:14Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-274ae14cae384b94944a1fd582f4ad912023-11-21T21:26:33ZengMDPI AGAtmosphere2073-44332021-05-0112668010.3390/atmos12060680Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation MeasurementsChris D. Boone0Johnathan Steffen1Jeff Crouse2Peter F. Bernath3Department of Chemistry, University of Waterloo, 200 University West, Waterloo, ON N2L 3G1, CanadaDepartment of Chemistry, University of Waterloo, 200 University West, Waterloo, ON N2L 3G1, CanadaDepartment of Chemistry, University of Waterloo, 200 University West, Waterloo, ON N2L 3G1, CanadaDepartment of Chemistry, University of Waterloo, 200 University West, Waterloo, ON N2L 3G1, CanadaLine-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.https://www.mdpi.com/2073-4433/12/6/680atmospheric windsDoppler effectremote sensingsolar occultation |
| spellingShingle | Chris D. Boone Johnathan Steffen Jeff Crouse Peter F. Bernath Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements Atmosphere atmospheric winds Doppler effect remote sensing solar occultation |
| title | Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements |
| title_full | Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements |
| title_fullStr | Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements |
| title_full_unstemmed | Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements |
| title_short | Line-of-Sight Winds and Doppler Effect Smearing in ACE-FTS Solar Occultation Measurements |
| title_sort | line of sight winds and doppler effect smearing in ace fts solar occultation measurements |
| topic | atmospheric winds Doppler effect remote sensing solar occultation |
| url | https://www.mdpi.com/2073-4433/12/6/680 |
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