Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model
HO<sub>2</sub> is an important atmospheric trace gas, whose sink to aerosol is poorly understood yet significant. Previous parameterisations of the rate of uptake have been limited by the lack of laboratory studies. This paper creates a parameterisation for γ<sub>HO<su...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2011-11-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/11/10965/2011/acp-11-10965-2011.pdf |
| _version_ | 1818683746604285952 |
|---|---|
| author | M. J. Evans H. L. Macintyre |
| author_facet | M. J. Evans H. L. Macintyre |
| author_sort | M. J. Evans |
| collection | DOAJ |
| description | HO<sub>2</sub> is an important atmospheric trace gas, whose sink to aerosol is poorly understood yet significant. Previous parameterisations of the rate of uptake have been limited by the lack of laboratory studies. This paper creates a parameterisation for γ<sub>HO<sub>2</sub></sub> based on the available laboratory studies. The calculated global mean γ<sub>HO<sub>2</sub></sub> is 0.028, significantly lower than previous work (0.2). Modelled concentrations of HO<sub>2</sub> show significant regional sensitivity to the value of γ<sub>HO<sub>2</sub></sub> (up to +106% at the surface with the parameterisation of γ<sub>HO<sub>2</sub></sub> in this work as compared with a value of 0.2), but global sensitivity is small (+3.2%). The modelled response in O<sub>3</sub> is also highly regional, being up to +27% at the surface over China, and only +0.3% globally (with the parameterisation of γ<sub>HO<sub>2</sub></sub> in this work as compared with a value of 0.2). The impact of γ<sub>HO<sub>2</sub></sub> on sulfate is more complex, with up to +16% over China and −5% over high latitudes, resulting in a global change of +1.2% (with the parameterisation of γ<sub>HO<sub>2</sub></sub> in this work as compared with a value of 0.2). Uncertainty in the reaction mechanism and hence products (previously assumed to be H<sub>2</sub>O<sub>2</sub>) impacts the processing of sulfur and hence aerosol loads. Further laboratory studies are desirable to constrain the rate of reaction and to elucidate the reaction mechanism and products. |
| first_indexed | 2024-12-17T10:39:38Z |
| format | Article |
| id | doaj.art-350ec956645e4d2f8f9adbf780e5e017 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-17T10:39:38Z |
| publishDate | 2011-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-350ec956645e4d2f8f9adbf780e5e0172022-12-21T21:52:16ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242011-11-011121109651097410.5194/acp-11-10965-2011Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric modelM. J. EvansH. L. MacintyreHO<sub>2</sub> is an important atmospheric trace gas, whose sink to aerosol is poorly understood yet significant. Previous parameterisations of the rate of uptake have been limited by the lack of laboratory studies. This paper creates a parameterisation for γ<sub>HO<sub>2</sub></sub> based on the available laboratory studies. The calculated global mean γ<sub>HO<sub>2</sub></sub> is 0.028, significantly lower than previous work (0.2). Modelled concentrations of HO<sub>2</sub> show significant regional sensitivity to the value of γ<sub>HO<sub>2</sub></sub> (up to +106% at the surface with the parameterisation of γ<sub>HO<sub>2</sub></sub> in this work as compared with a value of 0.2), but global sensitivity is small (+3.2%). The modelled response in O<sub>3</sub> is also highly regional, being up to +27% at the surface over China, and only +0.3% globally (with the parameterisation of γ<sub>HO<sub>2</sub></sub> in this work as compared with a value of 0.2). The impact of γ<sub>HO<sub>2</sub></sub> on sulfate is more complex, with up to +16% over China and −5% over high latitudes, resulting in a global change of +1.2% (with the parameterisation of γ<sub>HO<sub>2</sub></sub> in this work as compared with a value of 0.2). Uncertainty in the reaction mechanism and hence products (previously assumed to be H<sub>2</sub>O<sub>2</sub>) impacts the processing of sulfur and hence aerosol loads. Further laboratory studies are desirable to constrain the rate of reaction and to elucidate the reaction mechanism and products.http://www.atmos-chem-phys.net/11/10965/2011/acp-11-10965-2011.pdf |
| spellingShingle | M. J. Evans H. L. Macintyre Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model Atmospheric Chemistry and Physics |
| title | Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model |
| title_full | Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model |
| title_fullStr | Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model |
| title_full_unstemmed | Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model |
| title_short | Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model |
| title_sort | parameterisation and impact of aerosol uptake of ho sub 2 sub on a global tropospheric model |
| url | http://www.atmos-chem-phys.net/11/10965/2011/acp-11-10965-2011.pdf |
| work_keys_str_mv | AT mjevans parameterisationandimpactofaerosoluptakeofhosub2subonaglobaltroposphericmodel AT hlmacintyre parameterisationandimpactofaerosoluptakeofhosub2subonaglobaltroposphericmodel |