Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements
<p>Launched aboard the Canadian SCISAT satellite in August 2003, the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument has been measuring solar absorption spectra in the ultraviolet (UV) and visible part of the spectrum for more...
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Copernicus Publications
2025-02-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/18/569/2025/amt-18-569-2025.pdf |
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| author | P. S. Jeffery J. R. Drummond C. T. McElroy K. A. Walker J. Zou |
| author_facet | P. S. Jeffery J. R. Drummond C. T. McElroy K. A. Walker J. Zou |
| author_sort | P. S. Jeffery |
| collection | DOAJ |
| description | <p>Launched aboard the Canadian SCISAT satellite in August 2003, the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument has been measuring solar absorption spectra in the ultraviolet (UV) and visible part of the spectrum for more than 20 years. The UV-channel measurements from MAESTRO are used to retrieve profiles of ozone from the short-wavelength end of the Chappuis band (UV-ozone) and <span class="inline-formula">NO<sub>2</sub></span>, while measurements made in the visible part of the spectrum are used to retrieve a separate ozone (Vis-ozone) product. The latest ozone and <span class="inline-formula">NO<sub>2</sub></span> profile products, version 4.5, have been released, and they initially cover the period from February 2004 to December 2023, although they will continue to be updated. The version 4.5 retrieval algorithm represents an improvement from previous versions, with changes including updated pressure and temperature input information, an improved algorithm for high-Sun reference spectrum calculation, improved Rayleigh scattering modelling, and the change to a Twomey–Tikhonov inversion algorithm from a Chahine relaxation technique. Due to the buildup of an unknown contaminant, the UV-ozone and <span class="inline-formula">NO<sub>2</sub></span> products are only viable up to June 2009 for <span class="inline-formula">NO<sub>2</sub></span> and December 2009 for UV-ozone. This study presents comparisons of the version 4.5 MAESTRO ozone and <span class="inline-formula">NO<sub>2</sub></span> measurements with coincident (both spatially and temporally) measurements from an ensemble of 11 other satellite limb-viewing instruments. In the stratosphere, the Vis-ozone product was found to possess a small high bias, with stratosphere-averaged relative differences between 2.3 % and 8.2 %, although good agreement with the comparison datasets was found overall. A similar bias, albeit with slightly poorer agreement, is found for the UV-ozone product in the stratosphere, with the average stratospheric agreement between MAESTRO and the other datasets ranging from 2.8 % to 11.9 %. For <span class="inline-formula">NO<sub>2</sub></span>, general agreement with the comparison datasets is only found in the range from 20 to 40 <span class="inline-formula">km</span>. Within this range, MAESTRO is found to have a low bias for <span class="inline-formula">NO<sub>2</sub></span>, and most of the datasets agree to within 27.2 %, although the average agreement ranges from 8.5 % to 43.4 %.</p> |
| format | Article |
| id | doaj-art-5584567978bd478a86857df984c32df3 |
| institution | Kabale University |
| issn | 1867-1381 1867-8548 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Measurement Techniques |
| spelling | doaj-art-5584567978bd478a86857df984c32df32025-02-03T04:54:10ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482025-02-011856960210.5194/amt-18-569-2025Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurementsP. S. Jeffery0J. R. Drummond1C. T. McElroy2K. A. Walker3J. Zou4Department of Physics, University of Toronto, Toronto, ON, M5S1A7, CanadaDepartment of Physics and Atmospheric Physics, Dalhousie University, Halifax, NS, B3H4R2, CanadaDepartment of Earth and Space Science and Engineering, York University, Toronto, ON, M3J1P3, CanadaDepartment of Physics, University of Toronto, Toronto, ON, M5S1A7, CanadaDepartment of Physics, University of Toronto, Toronto, ON, M5S1A7, Canada<p>Launched aboard the Canadian SCISAT satellite in August 2003, the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument has been measuring solar absorption spectra in the ultraviolet (UV) and visible part of the spectrum for more than 20 years. The UV-channel measurements from MAESTRO are used to retrieve profiles of ozone from the short-wavelength end of the Chappuis band (UV-ozone) and <span class="inline-formula">NO<sub>2</sub></span>, while measurements made in the visible part of the spectrum are used to retrieve a separate ozone (Vis-ozone) product. The latest ozone and <span class="inline-formula">NO<sub>2</sub></span> profile products, version 4.5, have been released, and they initially cover the period from February 2004 to December 2023, although they will continue to be updated. The version 4.5 retrieval algorithm represents an improvement from previous versions, with changes including updated pressure and temperature input information, an improved algorithm for high-Sun reference spectrum calculation, improved Rayleigh scattering modelling, and the change to a Twomey–Tikhonov inversion algorithm from a Chahine relaxation technique. Due to the buildup of an unknown contaminant, the UV-ozone and <span class="inline-formula">NO<sub>2</sub></span> products are only viable up to June 2009 for <span class="inline-formula">NO<sub>2</sub></span> and December 2009 for UV-ozone. This study presents comparisons of the version 4.5 MAESTRO ozone and <span class="inline-formula">NO<sub>2</sub></span> measurements with coincident (both spatially and temporally) measurements from an ensemble of 11 other satellite limb-viewing instruments. In the stratosphere, the Vis-ozone product was found to possess a small high bias, with stratosphere-averaged relative differences between 2.3 % and 8.2 %, although good agreement with the comparison datasets was found overall. A similar bias, albeit with slightly poorer agreement, is found for the UV-ozone product in the stratosphere, with the average stratospheric agreement between MAESTRO and the other datasets ranging from 2.8 % to 11.9 %. For <span class="inline-formula">NO<sub>2</sub></span>, general agreement with the comparison datasets is only found in the range from 20 to 40 <span class="inline-formula">km</span>. Within this range, MAESTRO is found to have a low bias for <span class="inline-formula">NO<sub>2</sub></span>, and most of the datasets agree to within 27.2 %, although the average agreement ranges from 8.5 % to 43.4 %.</p>https://amt.copernicus.org/articles/18/569/2025/amt-18-569-2025.pdf |
| spellingShingle | P. S. Jeffery J. R. Drummond C. T. McElroy K. A. Walker J. Zou Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements Atmospheric Measurement Techniques |
| title | Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements |
| title_full | Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements |
| title_fullStr | Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements |
| title_full_unstemmed | Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements |
| title_short | Validation of the version 4.5 MAESTRO ozone and NO<sub>2</sub> measurements |
| title_sort | validation of the version 4 5 maestro ozone and no sub 2 sub measurements |
| url | https://amt.copernicus.org/articles/18/569/2025/amt-18-569-2025.pdf |
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