Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region
<p>Vertical profiles of aerosols, <span class="inline-formula">NO<sub>2</sub></span>, and <span class="inline-formula">SO<sub>2</sub></span> were retrieved from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS...
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Copernicus Publications
2020-03-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/13/1129/2020/amt-13-1129-2020.pdf |
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| author | Z. Y. W. Davis U. Frieß K. B. Strawbridge M. Aggarwaal S. Baray E. G. Schnitzler A. Lobo A. Lobo V. E. Fioletov I. Abboud C. A. McLinden J. Whiteway M. D. Willis M. D. Willis A. K. Y. Lee J. Brook J. Brook J. Olfert J. O'Brien R. Staebler H. D. Osthoff C. Mihele R. McLaren |
| author_facet | Z. Y. W. Davis U. Frieß K. B. Strawbridge M. Aggarwaal S. Baray E. G. Schnitzler A. Lobo A. Lobo V. E. Fioletov I. Abboud C. A. McLinden J. Whiteway M. D. Willis M. D. Willis A. K. Y. Lee J. Brook J. Brook J. Olfert J. O'Brien R. Staebler H. D. Osthoff C. Mihele R. McLaren |
| author_sort | Z. Y. W. Davis |
| collection | DOAJ |
| description | <p>Vertical profiles of aerosols, <span class="inline-formula">NO<sub>2</sub></span>, and <span class="inline-formula">SO<sub>2</sub></span> were retrieved from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements at a field site in northern Alberta, Canada, during August and September 2013. The site is approximately 16 km north of two mining operations that are major sources of industrial pollution in the Athabasca oil sands region. Pollution conditions during the study ranged from atmospheric background conditions to heavily polluted with elevated plumes, according to the meteorology. This study aimed to evaluate the performance of the aerosol and trace gas retrievals through comparison with data from a suite of other instruments. Comparisons of aerosol optical depths (AODs) from MAX-DOAS aerosol retrievals, lidar vertical profiles of aerosol extinction, and the AERONET sun photometer indicate good performance by the MAX-DOAS retrievals. These comparisons and modelling of the lidar S ratio highlight the need for
accurate knowledge of the temporal variation in the S ratio when comparing
MAX-DOAS and lidar data. Comparisons of MAX-DOAS <span class="inline-formula">NO<sub>2</sub></span> and <span class="inline-formula">SO<sub>2</sub></span> retrievals to Pandora spectral sun photometer vertical column densities (VCDs) and active DOAS mixing ratios indicate good performance of the retrievals, except when vertical profiles of pollutants within the boundary layer varied rapidly, temporally, and spatially. Near-surface retrievals tended to overestimate active DOAS mixing ratios. The MAX-DOAS observed elevated pollution plumes not observed by the active DOAS, highlighting one of the instrument's main advantages. Aircraft measurements of <span class="inline-formula">SO<sub>2</sub></span> were used to validate retrieved vertical profiles of <span class="inline-formula">SO<sub>2</sub></span>. Advantages of the MAX-DOAS instrument include increasing sensitivity towards the surface and the ability to simultaneously retrieve vertical profiles of aerosols and trace gases without requiring additional parameters, such as the S ratio. This complex dataset provided a rare opportunity to evaluate the performance of the MAX-DOAS retrievals under varying atmospheric conditions.</p> |
| first_indexed | 2024-12-23T10:59:53Z |
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| id | doaj.art-bb42ea68b3b3475b88a24cd2cb1e8bb0 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-23T10:59:53Z |
| publishDate | 2020-03-01 |
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| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-bb42ea68b3b3475b88a24cd2cb1e8bb02022-12-21T17:49:39ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482020-03-01131129115510.5194/amt-13-1129-2020Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands regionZ. Y. W. Davis0U. Frieß1K. B. Strawbridge2M. Aggarwaal3S. Baray4E. G. Schnitzler5A. Lobo6A. Lobo7V. E. Fioletov8I. Abboud9C. A. McLinden10J. Whiteway11M. D. Willis12M. D. Willis13A. K. Y. Lee14J. Brook15J. Brook16J. Olfert17J. O'Brien18R. Staebler19H. D. Osthoff20C. Mihele21R. McLaren22Department of Earth and Space Science, York University, Toronto, Ontario, M3J 1P3, CanadaInstitute of Environmental Physics, 69120 Heidelberg, GermanyEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaDepartment of Earth and Space Science, York University, Toronto, Ontario, M3J 1P3, CanadaCentre for Atmospheric Chemistry, York University, Toronto, Ontario, M3J 1P3, CanadaDepartment of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6, CanadaCentre for Atmospheric Chemistry, York University, Toronto, Ontario, M3J 1P3, Canadanow at: Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, V5Z 1M9, CanadaEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaDepartment of Earth and Space Science, York University, Toronto, Ontario, M3J 1P3, CanadaDepartment of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6, Canadanow at: Chemical Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, USADepartment of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore, SingaporeEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, Canadanow at: Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, M5S 3H6, CanadaDepartment of Mechanical Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, CanadaEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaDepartment of Chemistry, University of Calgary, Calgary, Alberta, T2N 1N4, CanadaEnvironment and Climate Change Canada, Toronto, Ontario, M3H 5T4, CanadaCentre for Atmospheric Chemistry, York University, Toronto, Ontario, M3J 1P3, Canada<p>Vertical profiles of aerosols, <span class="inline-formula">NO<sub>2</sub></span>, and <span class="inline-formula">SO<sub>2</sub></span> were retrieved from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements at a field site in northern Alberta, Canada, during August and September 2013. The site is approximately 16 km north of two mining operations that are major sources of industrial pollution in the Athabasca oil sands region. Pollution conditions during the study ranged from atmospheric background conditions to heavily polluted with elevated plumes, according to the meteorology. This study aimed to evaluate the performance of the aerosol and trace gas retrievals through comparison with data from a suite of other instruments. Comparisons of aerosol optical depths (AODs) from MAX-DOAS aerosol retrievals, lidar vertical profiles of aerosol extinction, and the AERONET sun photometer indicate good performance by the MAX-DOAS retrievals. These comparisons and modelling of the lidar S ratio highlight the need for accurate knowledge of the temporal variation in the S ratio when comparing MAX-DOAS and lidar data. Comparisons of MAX-DOAS <span class="inline-formula">NO<sub>2</sub></span> and <span class="inline-formula">SO<sub>2</sub></span> retrievals to Pandora spectral sun photometer vertical column densities (VCDs) and active DOAS mixing ratios indicate good performance of the retrievals, except when vertical profiles of pollutants within the boundary layer varied rapidly, temporally, and spatially. Near-surface retrievals tended to overestimate active DOAS mixing ratios. The MAX-DOAS observed elevated pollution plumes not observed by the active DOAS, highlighting one of the instrument's main advantages. Aircraft measurements of <span class="inline-formula">SO<sub>2</sub></span> were used to validate retrieved vertical profiles of <span class="inline-formula">SO<sub>2</sub></span>. Advantages of the MAX-DOAS instrument include increasing sensitivity towards the surface and the ability to simultaneously retrieve vertical profiles of aerosols and trace gases without requiring additional parameters, such as the S ratio. This complex dataset provided a rare opportunity to evaluate the performance of the MAX-DOAS retrievals under varying atmospheric conditions.</p>https://www.atmos-meas-tech.net/13/1129/2020/amt-13-1129-2020.pdf |
| spellingShingle | Z. Y. W. Davis U. Frieß K. B. Strawbridge M. Aggarwaal S. Baray E. G. Schnitzler A. Lobo A. Lobo V. E. Fioletov I. Abboud C. A. McLinden J. Whiteway M. D. Willis M. D. Willis A. K. Y. Lee J. Brook J. Brook J. Olfert J. O'Brien R. Staebler H. D. Osthoff C. Mihele R. McLaren Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region Atmospheric Measurement Techniques |
| title | Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region |
| title_full | Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region |
| title_fullStr | Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region |
| title_full_unstemmed | Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region |
| title_short | Validation of MAX-DOAS retrievals of aerosol extinction, SO<sub>2</sub>, and NO<sub>2</sub> through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region |
| title_sort | validation of max doas retrievals of aerosol extinction so sub 2 sub and no sub 2 sub through comparison with lidar sun photometer active doas and aircraft measurements in the athabasca oil sands region |
| url | https://www.atmos-meas-tech.net/13/1129/2020/amt-13-1129-2020.pdf |
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