Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013)
In this paper, we assess how daily ozone (O[subscript 3]) measurements from the Infrared Atmospheric Sounding Interferometer (IASI) on the MetOp-A platform can contribute to the analyses of the processes driving O[subscript 3] variability in the troposphere and the stratosphere and, in the future, t...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Copernicus GmbH
2016
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| Online Access: | http://hdl.handle.net/1721.1/106177 https://orcid.org/0000-0002-8947-7950 |
| _version_ | 1811083178772791296 |
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| author | Wespes, Catherine Hurtmans, Daniel Emmons, Louisa K. Safieddine, Sarah Clerbaux, Cathy Edwards, David P. Coheur, Pierre-François |
| author2 | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Wespes, Catherine Hurtmans, Daniel Emmons, Louisa K. Safieddine, Sarah Clerbaux, Cathy Edwards, David P. Coheur, Pierre-François |
| author_sort | Wespes, Catherine |
| collection | MIT |
| description | In this paper, we assess how daily ozone (O[subscript 3]) measurements from the Infrared Atmospheric Sounding Interferometer (IASI) on the MetOp-A platform can contribute to the analyses of the processes driving O[subscript 3] variability in the troposphere and the stratosphere and, in the future, to the monitoring of long-term trends. The temporal evolution of O[subscript 3] during the first 6 years of IASI (2008–2013) operation is investigated with multivariate regressions separately in four different layers (ground–300, 300–150, 150–25, 25–3 hPa), by adjusting to the daily time series averaged in 20° zonal bands, seasonal and linear trend terms along with important geophysical drivers of O[subscript 3] variation (e.g. solar flux, quasi-biennial oscillation (QBO)). The regression model is shown to perform generally very well with a strong dominance of the annual harmonic terms and significant contributions from O[subscript 3] drivers, in particular in the equatorial region where the QBO and the solar flux contribution dominate. More particularly, despite the short period of the IASI data set available up to now, two noticeable statistically significant apparent trends are inferred from the daily IASI measurements: a positive trend in the upper stratosphere (e.g. 1.74 ± 0.77 DU year[superscript −1] between 30 and 50° S), which is consistent with other studies suggesting a turnaround for stratospheric O[subscript 3] recovery, and a negative trend in the troposphere at the mid-latitudes and high northern latitudes (e.g. −0.26 ± 0.11 DU year[superscript −1] between 30 and 50° N), especially during summer and probably linked to the impact of decreasing ozone precursor emissions. The impact of the high temporal sampling of IASI on the uncertainty in the determination of O[subscript 3] trend has been further explored by performing multivariate regressions on IASI monthly averages and on ground-based Fourier transform infrared (FTIR) measurements. |
| first_indexed | 2024-09-23T12:27:03Z |
| format | Article |
| id | mit-1721.1/106177 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:27:03Z |
| publishDate | 2016 |
| publisher | Copernicus GmbH |
| record_format | dspace |
| spelling | mit-1721.1/1061772022-10-01T09:13:27Z Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) Wespes, Catherine Hurtmans, Daniel Emmons, Louisa K. Safieddine, Sarah Clerbaux, Cathy Edwards, David P. Coheur, Pierre-François Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Safieddine, Sarah In this paper, we assess how daily ozone (O[subscript 3]) measurements from the Infrared Atmospheric Sounding Interferometer (IASI) on the MetOp-A platform can contribute to the analyses of the processes driving O[subscript 3] variability in the troposphere and the stratosphere and, in the future, to the monitoring of long-term trends. The temporal evolution of O[subscript 3] during the first 6 years of IASI (2008–2013) operation is investigated with multivariate regressions separately in four different layers (ground–300, 300–150, 150–25, 25–3 hPa), by adjusting to the daily time series averaged in 20° zonal bands, seasonal and linear trend terms along with important geophysical drivers of O[subscript 3] variation (e.g. solar flux, quasi-biennial oscillation (QBO)). The regression model is shown to perform generally very well with a strong dominance of the annual harmonic terms and significant contributions from O[subscript 3] drivers, in particular in the equatorial region where the QBO and the solar flux contribution dominate. More particularly, despite the short period of the IASI data set available up to now, two noticeable statistically significant apparent trends are inferred from the daily IASI measurements: a positive trend in the upper stratosphere (e.g. 1.74 ± 0.77 DU year[superscript −1] between 30 and 50° S), which is consistent with other studies suggesting a turnaround for stratospheric O[subscript 3] recovery, and a negative trend in the troposphere at the mid-latitudes and high northern latitudes (e.g. −0.26 ± 0.11 DU year[superscript −1] between 30 and 50° N), especially during summer and probably linked to the impact of decreasing ozone precursor emissions. The impact of the high temporal sampling of IASI on the uncertainty in the determination of O[subscript 3] trend has been further explored by performing multivariate regressions on IASI monthly averages and on ground-based Fourier transform infrared (FTIR) measurements. 2016-12-29T20:01:42Z 2016-12-29T20:01:42Z 2016-05 2016-03 Article http://purl.org/eprint/type/JournalArticle 1680-7324 http://hdl.handle.net/1721.1/106177 Wespes, Catherine et al. “Ozone Variability in the Troposphere and the Stratosphere from the First 6 Years of IASI Observations (2008–2013).” Atmospheric Chemistry and Physics 16.9 (2016): 5721–5743. https://orcid.org/0000-0002-8947-7950 en_US http://dx.doi.org/10.5194/acp-16-5721-2016 Atmospheric Chemistry and Physics Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf Copernicus GmbH Copernicus Publications |
| spellingShingle | Wespes, Catherine Hurtmans, Daniel Emmons, Louisa K. Safieddine, Sarah Clerbaux, Cathy Edwards, David P. Coheur, Pierre-François Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) |
| title | Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) |
| title_full | Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) |
| title_fullStr | Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) |
| title_full_unstemmed | Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) |
| title_short | Ozone variability in the troposphere and the stratosphere from the first 6 years of IASI observations (2008–2013) |
| title_sort | ozone variability in the troposphere and the stratosphere from the first 6 years of iasi observations 2008 2013 |
| url | http://hdl.handle.net/1721.1/106177 https://orcid.org/0000-0002-8947-7950 |
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