Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC
<p>The atmospheric chemistry of halogenated species (Cl, Br, I) participates in the global chemical sink of tropospheric ozone and perturbs the oxidising capacity of the troposphere, notably by influencing the atmospheric lifetime of methane. Global chemistry–climate models are commonly used t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-07-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/16/4041/2023/gmd-16-4041-2023.pdf |
| _version_ | 1797777984060391424 |
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| author | C. Caram S. Szopa A. Cozic S. Bekki C. A. Cuevas A. Saiz-Lopez |
| author_facet | C. Caram S. Szopa A. Cozic S. Bekki C. A. Cuevas A. Saiz-Lopez |
| author_sort | C. Caram |
| collection | DOAJ |
| description | <p>The atmospheric chemistry of halogenated species (Cl, Br, I)
participates in the global chemical sink of tropospheric ozone and perturbs
the oxidising capacity of the troposphere, notably by influencing the
atmospheric lifetime of methane. Global chemistry–climate models are
commonly used to assess the global budget of ozone and its sensitivity to
emissions of its precursors, as well as to project its long-term evolution. Here,
we report on the implementation of tropospheric sources and chemistry of
halogens in the chemistry–climate model LMDZ-INCA (Laboratoire de Météorologie Dynamique general circulation model, LMDZ, and Interactions with Chemistry and Aerosols, INCA, version with Non-Methane HydroCarbon chemistry, vNMHC) and evaluate halogen
effects on the tropospheric ozone budget. Overall, the results show that the
model simulates satisfactorily the impact of halogens on the photo-oxidising
system in the troposphere, in particular in the marine boundary layer. To
quantify the effects of halogen chemistry in LMDZ-INCA, standard metrics
representative of the behaviour of the tropospheric chemical system (O<span class="inline-formula"><sub><i>x</i></sub></span>,
HO<span class="inline-formula"><sub><i>x</i></sub></span>, NO<span class="inline-formula"><sub><i>x</i></sub></span>, CH<span class="inline-formula"><sub>4</sub></span> and non-methane volatile organic compounds – NMVOCs) are computed with and without
halogens. The addition of tropospheric halogens in the LMDZ-INCA model leads to
a decrease of 22 % in the ozone burden, 8 % in OH and 33 % in NO<span class="inline-formula"><sub><i>x</i></sub></span>.
Sensitivity simulations show for the first time that the inclusion of
halogen chemistry makes ozone more sensitive to perturbations in CH<span class="inline-formula"><sub>4</sub></span>,
NO<span class="inline-formula"><sub><i>x</i></sub></span> and NMVOCs. Consistent with other global model studies, the
sensitivity of the tropospheric ozone burden to changes from pre-industrial
to present-day emissions is found to be <span class="inline-formula">∼20</span> % lower when
tropospheric halogens are taken into account.</p> |
| first_indexed | 2024-03-12T23:10:49Z |
| format | Article |
| id | doaj.art-a7d4eb23f45a4265a3f3659a83d70c62 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-03-12T23:10:49Z |
| publishDate | 2023-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-a7d4eb23f45a4265a3f3659a83d70c622023-07-18T05:31:11ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032023-07-01164041406210.5194/gmd-16-4041-2023Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHCC. Caram0S. Szopa1A. Cozic2S. Bekki3C. A. Cuevas4A. Saiz-Lopez5Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, FranceLaboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, FranceLaboratoire Atmosphère, Milieux, Observations Spatiales, Institut Pierre Simon Laplace, LATMOS/IPSL, CNRS-UVSQ-Sorbonne Université, Guyancourt and Paris, FranceDepartment of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, SpainDepartment of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain<p>The atmospheric chemistry of halogenated species (Cl, Br, I) participates in the global chemical sink of tropospheric ozone and perturbs the oxidising capacity of the troposphere, notably by influencing the atmospheric lifetime of methane. Global chemistry–climate models are commonly used to assess the global budget of ozone and its sensitivity to emissions of its precursors, as well as to project its long-term evolution. Here, we report on the implementation of tropospheric sources and chemistry of halogens in the chemistry–climate model LMDZ-INCA (Laboratoire de Météorologie Dynamique general circulation model, LMDZ, and Interactions with Chemistry and Aerosols, INCA, version with Non-Methane HydroCarbon chemistry, vNMHC) and evaluate halogen effects on the tropospheric ozone budget. Overall, the results show that the model simulates satisfactorily the impact of halogens on the photo-oxidising system in the troposphere, in particular in the marine boundary layer. To quantify the effects of halogen chemistry in LMDZ-INCA, standard metrics representative of the behaviour of the tropospheric chemical system (O<span class="inline-formula"><sub><i>x</i></sub></span>, HO<span class="inline-formula"><sub><i>x</i></sub></span>, NO<span class="inline-formula"><sub><i>x</i></sub></span>, CH<span class="inline-formula"><sub>4</sub></span> and non-methane volatile organic compounds – NMVOCs) are computed with and without halogens. The addition of tropospheric halogens in the LMDZ-INCA model leads to a decrease of 22 % in the ozone burden, 8 % in OH and 33 % in NO<span class="inline-formula"><sub><i>x</i></sub></span>. Sensitivity simulations show for the first time that the inclusion of halogen chemistry makes ozone more sensitive to perturbations in CH<span class="inline-formula"><sub>4</sub></span>, NO<span class="inline-formula"><sub><i>x</i></sub></span> and NMVOCs. Consistent with other global model studies, the sensitivity of the tropospheric ozone burden to changes from pre-industrial to present-day emissions is found to be <span class="inline-formula">∼20</span> % lower when tropospheric halogens are taken into account.</p>https://gmd.copernicus.org/articles/16/4041/2023/gmd-16-4041-2023.pdf |
| spellingShingle | C. Caram S. Szopa A. Cozic S. Bekki C. A. Cuevas A. Saiz-Lopez Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC Geoscientific Model Development |
| title | Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC |
| title_full | Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC |
| title_fullStr | Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC |
| title_full_unstemmed | Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC |
| title_short | Sensitivity of tropospheric ozone to halogen chemistry in the chemistry–climate model LMDZ-INCA vNMHC |
| title_sort | sensitivity of tropospheric ozone to halogen chemistry in the chemistry climate model lmdz inca vnmhc |
| url | https://gmd.copernicus.org/articles/16/4041/2023/gmd-16-4041-2023.pdf |
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