Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere
We have integrated observations of tropospheric ozone, very short-lived (VSL) halocarbons and reactive iodine and bromine species from a wide variety of tropical data sources with the global CAM-Chem chemistry-climate model and offline radiative transfer calculations to compute the contribution of h...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-05-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/12/3939/2012/acp-12-3939-2012.pdf |
| _version_ | 1818583914334126080 |
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| author | A. Saiz-Lopez J.-F. Lamarque D. E. Kinnison S. Tilmes C. Ordóñez J. J. Orlando A. J. Conley J. M. C. Plane A. S. Mahajan G. Sousa Santos E. L. Atlas D. R. Blake S. P. Sander S. Schauffler A. M. Thompson G. Brasseur |
| author_facet | A. Saiz-Lopez J.-F. Lamarque D. E. Kinnison S. Tilmes C. Ordóñez J. J. Orlando A. J. Conley J. M. C. Plane A. S. Mahajan G. Sousa Santos E. L. Atlas D. R. Blake S. P. Sander S. Schauffler A. M. Thompson G. Brasseur |
| author_sort | A. Saiz-Lopez |
| collection | DOAJ |
| description | We have integrated observations of tropospheric ozone, very short-lived (VSL) halocarbons and reactive iodine and bromine species from a wide variety of tropical data sources with the global CAM-Chem chemistry-climate model and offline radiative transfer calculations to compute the contribution of halogen chemistry to ozone loss and associated radiative impact in the tropical marine troposphere. The inclusion of tropospheric halogen chemistry in CAM-Chem leads to an annually averaged depletion of around 10% (~2.5 Dobson units) of the tropical tropospheric ozone column, with largest effects in the middle to upper troposphere. This depletion contributes approximately −0.10 W m<sup>−2</sup> to the radiative flux at the tropical tropopause. This negative flux is of similar magnitude to the ~0.33 W m<sup>−2</sup> contribution of tropospheric ozone to present-day radiative balance as recently estimated from satellite observations. We find that the implementation of oceanic halogen sources and chemistry in climate models is an important component of the natural background ozone budget and we suggest that it needs to be considered when estimating both preindustrial ozone baseline levels and long term changes in tropospheric ozone. |
| first_indexed | 2024-12-16T08:12:51Z |
| format | Article |
| id | doaj.art-37029ee8e2754af28c32dac4a30055ac |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-16T08:12:51Z |
| publishDate | 2012-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-37029ee8e2754af28c32dac4a30055ac2022-12-21T22:38:18ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242012-05-011293939394910.5194/acp-12-3939-2012Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphereA. Saiz-LopezJ.-F. LamarqueD. E. KinnisonS. TilmesC. OrdóñezJ. J. OrlandoA. J. ConleyJ. M. C. PlaneA. S. MahajanG. Sousa SantosE. L. AtlasD. R. BlakeS. P. SanderS. SchaufflerA. M. ThompsonG. BrasseurWe have integrated observations of tropospheric ozone, very short-lived (VSL) halocarbons and reactive iodine and bromine species from a wide variety of tropical data sources with the global CAM-Chem chemistry-climate model and offline radiative transfer calculations to compute the contribution of halogen chemistry to ozone loss and associated radiative impact in the tropical marine troposphere. The inclusion of tropospheric halogen chemistry in CAM-Chem leads to an annually averaged depletion of around 10% (~2.5 Dobson units) of the tropical tropospheric ozone column, with largest effects in the middle to upper troposphere. This depletion contributes approximately −0.10 W m<sup>−2</sup> to the radiative flux at the tropical tropopause. This negative flux is of similar magnitude to the ~0.33 W m<sup>−2</sup> contribution of tropospheric ozone to present-day radiative balance as recently estimated from satellite observations. We find that the implementation of oceanic halogen sources and chemistry in climate models is an important component of the natural background ozone budget and we suggest that it needs to be considered when estimating both preindustrial ozone baseline levels and long term changes in tropospheric ozone.http://www.atmos-chem-phys.net/12/3939/2012/acp-12-3939-2012.pdf |
| spellingShingle | A. Saiz-Lopez J.-F. Lamarque D. E. Kinnison S. Tilmes C. Ordóñez J. J. Orlando A. J. Conley J. M. C. Plane A. S. Mahajan G. Sousa Santos E. L. Atlas D. R. Blake S. P. Sander S. Schauffler A. M. Thompson G. Brasseur Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere Atmospheric Chemistry and Physics |
| title | Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere |
| title_full | Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere |
| title_fullStr | Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere |
| title_full_unstemmed | Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere |
| title_short | Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere |
| title_sort | estimating the climate significance of halogen driven ozone loss in the tropical marine troposphere |
| url | http://www.atmos-chem-phys.net/12/3939/2012/acp-12-3939-2012.pdf |
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