An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates
<p>We describe the new and improved version 2 of the ozone profile research product from the Ozone Monitoring Instrument (OMI) on the Aura satellite. One of the major changes is to switch the OMI L1b data from collection 3 to the recent collection 4 as well as the accompanying auxiliary datase...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2024-04-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/17/1891/2024/amt-17-1891-2024.pdf |
| _version_ | 1797222452733935616 |
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| author | J. Bak X. Liu K. Yang G. Gonzalez Abad E. O'Sullivan K. Chance C.-H. Kim C.-H. Kim |
| author_facet | J. Bak X. Liu K. Yang G. Gonzalez Abad E. O'Sullivan K. Chance C.-H. Kim C.-H. Kim |
| author_sort | J. Bak |
| collection | DOAJ |
| description | <p>We describe the new and improved version 2 of the ozone profile research product from the Ozone Monitoring Instrument (OMI) on the Aura satellite. One of the major changes is to switch the OMI L1b data from collection 3 to the recent collection 4 as well as the accompanying auxiliary datasets. The algorithm details are updated on radiative transfer model calculation and measurement calibrations, along with the input changes in meteorological data, and with the use of a tropopause-based ozone profile climatology, an improved high-resolution solar reference spectrum, and a recent ozone absorption cross-section dataset. A super Gaussian is applied to better represent OMI slit functions instead of a normal Gaussian. The effect of slit function errors on the spectral residuals is further accounted for as pseudo-absorbers in the iterative fit process. The OMI irradiances are averaged into monthly composites to reduce noise uncertainties in OMI daily measurements and to cancel out the temporal variations of instrument characteristics that are common in both radiance and irradiance measurements, which was previously neglected due to use of climatological composites. The empirical soft calibration spectra are re-derived to be consistent with the updated implementations and derived annually to remove the time-varying systematic biases between measured and simulated radiances. The “common mode” correction spectra are derived from remaining residual spectra after soft calibration as a function of solar zenith angle. The common mode is included as a pseudo-absorber in the iterative fit process, which helps to reduce the discrepancies of ozone retrieval accuracy between lower and higher solar zenith angles and between nadir and off-nadir pixels. Validation with ozonesonde measurements demonstrates the improvements of ozone profile retrievals in the troposphere, especially around the tropopause. The retrieval quality of tropospheric column ozone is improved with respect to the seasonal consistency between winter and summer as well as the long-term consistency before and after the row-anomaly occurrence.</p> |
| first_indexed | 2024-04-24T13:21:34Z |
| format | Article |
| id | doaj.art-7c2a10fc53d24b989fd69340342ff2f1 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-04-24T13:21:34Z |
| publishDate | 2024-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-7c2a10fc53d24b989fd69340342ff2f12024-04-04T13:47:07ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482024-04-01171891191110.5194/amt-17-1891-2024An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updatesJ. Bak0X. Liu1K. Yang2G. Gonzalez Abad3E. O'Sullivan4K. Chance5C.-H. Kim6C.-H. Kim7Institute of Environmental Studies, Pusan National University, Busan 46241, Republic of KoreaSmithsonian Astrophysical Observatory (SAO), Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, USADepartment of Atmospheric Sciences, University of Maryland, College Park, MD 20742, USASmithsonian Astrophysical Observatory (SAO), Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, USASmithsonian Astrophysical Observatory (SAO), Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, USASmithsonian Astrophysical Observatory (SAO), Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, USAInstitute of Environmental Studies, Pusan National University, Busan 46241, Republic of KoreaDepartment of Atmospheric Sciences, Pusan National University, Busan 46241, South Korea<p>We describe the new and improved version 2 of the ozone profile research product from the Ozone Monitoring Instrument (OMI) on the Aura satellite. One of the major changes is to switch the OMI L1b data from collection 3 to the recent collection 4 as well as the accompanying auxiliary datasets. The algorithm details are updated on radiative transfer model calculation and measurement calibrations, along with the input changes in meteorological data, and with the use of a tropopause-based ozone profile climatology, an improved high-resolution solar reference spectrum, and a recent ozone absorption cross-section dataset. A super Gaussian is applied to better represent OMI slit functions instead of a normal Gaussian. The effect of slit function errors on the spectral residuals is further accounted for as pseudo-absorbers in the iterative fit process. The OMI irradiances are averaged into monthly composites to reduce noise uncertainties in OMI daily measurements and to cancel out the temporal variations of instrument characteristics that are common in both radiance and irradiance measurements, which was previously neglected due to use of climatological composites. The empirical soft calibration spectra are re-derived to be consistent with the updated implementations and derived annually to remove the time-varying systematic biases between measured and simulated radiances. The “common mode” correction spectra are derived from remaining residual spectra after soft calibration as a function of solar zenith angle. The common mode is included as a pseudo-absorber in the iterative fit process, which helps to reduce the discrepancies of ozone retrieval accuracy between lower and higher solar zenith angles and between nadir and off-nadir pixels. Validation with ozonesonde measurements demonstrates the improvements of ozone profile retrievals in the troposphere, especially around the tropopause. The retrieval quality of tropospheric column ozone is improved with respect to the seasonal consistency between winter and summer as well as the long-term consistency before and after the row-anomaly occurrence.</p>https://amt.copernicus.org/articles/17/1891/2024/amt-17-1891-2024.pdf |
| spellingShingle | J. Bak X. Liu K. Yang G. Gonzalez Abad E. O'Sullivan K. Chance C.-H. Kim C.-H. Kim An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates Atmospheric Measurement Techniques |
| title | An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates |
| title_full | An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates |
| title_fullStr | An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates |
| title_full_unstemmed | An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates |
| title_short | An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates |
| title_sort | improved omi ozone profile research product version 2 0 with collection 4 l1b data and algorithm updates |
| url | https://amt.copernicus.org/articles/17/1891/2024/amt-17-1891-2024.pdf |
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