Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses
<p>The information content of thermal infrared measurements for tropospheric ozone (O<span class="inline-formula"><sub>3</sub></span>) estimation has already been well demonstrated. However, the impact of such measurements to constrain modelled O<span class...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-10-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/14/6291/2021/gmd-14-6291-2021.pdf |
| _version_ | 1818400127502516224 |
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| author | E. Emili M. El Aabaribaoune |
| author_facet | E. Emili M. El Aabaribaoune |
| author_sort | E. Emili |
| collection | DOAJ |
| description | <p>The information content of thermal infrared measurements for tropospheric ozone (O<span class="inline-formula"><sub>3</sub></span>) estimation has already been well demonstrated. However, the impact of such measurements to constrain modelled O<span class="inline-formula"><sub>3</sub></span> distributions within global assimilation systems is not yet unequivocal. A new tropospheric O<span class="inline-formula"><sub>3</sub></span> reanalysis is computed for the year 2010 by means of assimilating measurements from the Infrared Atmospheric Sounding Interferometer (IASI) within the MOdéle pour la Chimie Á Grande Echelle (MOCAGE) chemical transport model. The objective is to evaluate the impact of recent methodological improvements of the data assimilation scheme on the O<span class="inline-formula"><sub>3</sub></span> distribution. The new O<span class="inline-formula"><sub>3</sub></span> reanalysis (named IASI-r) and its precursor (IASI-a) have been validated against ozonesondes, and compared to independent estimations of tropospheric O<span class="inline-formula"><sub>3</sub></span> and to results from two state-of-the-art products based on detailed tropospheric chemistry (the Goddard Earth Observing System with a coupled chemistry–climate model, GEOS-CCM, and the Copernicus Atmosphere Monitoring Service, CAMS, reanalysis). The main difference between IASI-r and IASI-a concerns the treatment of IASI observations, with radiances being assimilated directly in IASI-r instead of intermediate Level 2 O<span class="inline-formula"><sub>3</sub></span> retrievals. IASI-r is found to correct major issues with IASI-a, such as the neutral or negative impact of IASI assimilation in the extra-tropics and the presence of residual biases in the tropics. IASI-r also compares relatively well to the CAMS reanalysis, which is based on a more comprehensive chemical mechanism and the assimilation of several ultraviolet (UV) and microwave measurements.</p> |
| first_indexed | 2024-12-14T07:31:38Z |
| format | Article |
| id | doaj.art-c14f553421e04a8c89ea2e6b34407354 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-14T07:31:38Z |
| publishDate | 2021-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-c14f553421e04a8c89ea2e6b344073542022-12-21T23:11:21ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032021-10-01146291630810.5194/gmd-14-6291-2021Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalysesE. EmiliM. El Aabaribaoune<p>The information content of thermal infrared measurements for tropospheric ozone (O<span class="inline-formula"><sub>3</sub></span>) estimation has already been well demonstrated. However, the impact of such measurements to constrain modelled O<span class="inline-formula"><sub>3</sub></span> distributions within global assimilation systems is not yet unequivocal. A new tropospheric O<span class="inline-formula"><sub>3</sub></span> reanalysis is computed for the year 2010 by means of assimilating measurements from the Infrared Atmospheric Sounding Interferometer (IASI) within the MOdéle pour la Chimie Á Grande Echelle (MOCAGE) chemical transport model. The objective is to evaluate the impact of recent methodological improvements of the data assimilation scheme on the O<span class="inline-formula"><sub>3</sub></span> distribution. The new O<span class="inline-formula"><sub>3</sub></span> reanalysis (named IASI-r) and its precursor (IASI-a) have been validated against ozonesondes, and compared to independent estimations of tropospheric O<span class="inline-formula"><sub>3</sub></span> and to results from two state-of-the-art products based on detailed tropospheric chemistry (the Goddard Earth Observing System with a coupled chemistry–climate model, GEOS-CCM, and the Copernicus Atmosphere Monitoring Service, CAMS, reanalysis). The main difference between IASI-r and IASI-a concerns the treatment of IASI observations, with radiances being assimilated directly in IASI-r instead of intermediate Level 2 O<span class="inline-formula"><sub>3</sub></span> retrievals. IASI-r is found to correct major issues with IASI-a, such as the neutral or negative impact of IASI assimilation in the extra-tropics and the presence of residual biases in the tropics. IASI-r also compares relatively well to the CAMS reanalysis, which is based on a more comprehensive chemical mechanism and the assimilation of several ultraviolet (UV) and microwave measurements.</p>https://gmd.copernicus.org/articles/14/6291/2021/gmd-14-6291-2021.pdf |
| spellingShingle | E. Emili M. El Aabaribaoune Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses Geoscientific Model Development |
| title | Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses |
| title_full | Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses |
| title_fullStr | Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses |
| title_full_unstemmed | Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses |
| title_short | Impact of Infrared Atmospheric Sounding Interferometer (IASI) thermal infrared measurements on global ozone reanalyses |
| title_sort | impact of infrared atmospheric sounding interferometer iasi thermal infrared measurements on global ozone reanalyses |
| url | https://gmd.copernicus.org/articles/14/6291/2021/gmd-14-6291-2021.pdf |
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