Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2
<p>We have implemented and evaluated a secondary organic aerosol scheme within the chemistry transport model TM5-MP in this work. In earlier versions of TM5-MP the secondary organic aerosol (SOA) was emitted as Aitken-sized particle mass emulating the condensation. In the current scheme we sim...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-01-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/15/683/2022/gmd-15-683-2022.pdf |
| _version_ | 1818715756121030656 |
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| author | T. Bergman T. Bergman R. Makkonen R. Makkonen R. Schrödner R. Schrödner E. Swietlicki V. T. J. Phillips P. Le Sager T. van Noije |
| author_facet | T. Bergman T. Bergman R. Makkonen R. Makkonen R. Schrödner R. Schrödner E. Swietlicki V. T. J. Phillips P. Le Sager T. van Noije |
| author_sort | T. Bergman |
| collection | DOAJ |
| description | <p>We have implemented and evaluated a secondary organic aerosol scheme within the chemistry transport model TM5-MP in this work. In earlier versions of TM5-MP the secondary organic aerosol (SOA) was emitted as Aitken-sized particle mass emulating the condensation. In the current scheme we simulate the formation of secondary organic aerosol from oxidation of isoprene and monoterpenes by ozone and hydroxyl radicals, which produce semi-volatile organic compounds (SVOCs) and extremely low-volatility compounds (EVOCs). Subsequently, SVOCs and ELVOCs can condense on particles. Furthermore, we have introduced a new particle formation mechanism depending on the concentration of ELVOCs. For evaluation purposes, we have simulated the year 2010 with the old and new scheme; we see an increase in simulated production of SOA from 39.9 Tg yr<span class="inline-formula"><sup>−1</sup></span> with the old scheme to 52.5 Tg yr<span class="inline-formula"><sup>−1</sup></span> with the new scheme. For more detailed analysis, the particle mass and number concentrations and their influence on the simulated aerosol optical depth are compared to observations. Phenomenologically, the new particle formation scheme implemented here is able to reproduce the occurrence of observed particle formation events. However, the modelled concentrations of formed particles are clearly lower than in observations, as is the subsequent growth to larger sizes. Compared to the old scheme, the new scheme increases the number concentrations across the observation stations while still underestimating the observations. The organic aerosol mass concentrations in the US show a much better seasonal cycle and no clear overestimation of mass concentrations anymore. In Europe the mass concentrations are lowered, leading to a larger underestimation of observations. Aerosol optical depth (AOD) is generally slightly increased except in the northern high latitudes. This brings the simulated annual global mean AOD closer to the observational estimate. However, as the increase is rather uniform, biases tend to be reduced only in regions where the model underestimates the AOD. Furthermore, the correlations with satellite retrievals and ground-based sun-photometer observations of AOD are improved. Although the process-based approach to SOA formation causes a reduction in model performance in some areas, overall the new scheme improves the simulated aerosol fields.</p> |
| first_indexed | 2024-12-17T19:08:25Z |
| format | Article |
| id | doaj.art-4f21f144e5de486898afd858ec9b5714 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-17T19:08:25Z |
| publishDate | 2022-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-4f21f144e5de486898afd858ec9b57142022-12-21T21:35:57ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032022-01-011568371310.5194/gmd-15-683-2022Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2T. Bergman0T. Bergman1R. Makkonen2R. Makkonen3R. Schrödner4R. Schrödner5E. Swietlicki6V. T. J. Phillips7P. Le Sager8T. van Noije9R & D Weather and Climate Modeling, Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE De Bilt, the NetherlandsClimate System Research, Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, FinlandClimate System Research, Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, FinlandInstitute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, 00014 Helsinki, FinlandModeling of Atmospheric Processes, Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, GermanyCentre for Environmental and Climate Science, Lund University, Sölvegatan 37, 22362 Lund, SwedenDepartment of Physics, Lund University, P.O. Box 118, 22100 Lund, SwedenDepartment of Physical Geography and Ecosystem Science, Lund University, Sölvegatan 12, 22362 Lund, SwedenR & D Weather and Climate Modeling, Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE De Bilt, the NetherlandsR & D Weather and Climate Modeling, Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE De Bilt, the Netherlands<p>We have implemented and evaluated a secondary organic aerosol scheme within the chemistry transport model TM5-MP in this work. In earlier versions of TM5-MP the secondary organic aerosol (SOA) was emitted as Aitken-sized particle mass emulating the condensation. In the current scheme we simulate the formation of secondary organic aerosol from oxidation of isoprene and monoterpenes by ozone and hydroxyl radicals, which produce semi-volatile organic compounds (SVOCs) and extremely low-volatility compounds (EVOCs). Subsequently, SVOCs and ELVOCs can condense on particles. Furthermore, we have introduced a new particle formation mechanism depending on the concentration of ELVOCs. For evaluation purposes, we have simulated the year 2010 with the old and new scheme; we see an increase in simulated production of SOA from 39.9 Tg yr<span class="inline-formula"><sup>−1</sup></span> with the old scheme to 52.5 Tg yr<span class="inline-formula"><sup>−1</sup></span> with the new scheme. For more detailed analysis, the particle mass and number concentrations and their influence on the simulated aerosol optical depth are compared to observations. Phenomenologically, the new particle formation scheme implemented here is able to reproduce the occurrence of observed particle formation events. However, the modelled concentrations of formed particles are clearly lower than in observations, as is the subsequent growth to larger sizes. Compared to the old scheme, the new scheme increases the number concentrations across the observation stations while still underestimating the observations. The organic aerosol mass concentrations in the US show a much better seasonal cycle and no clear overestimation of mass concentrations anymore. In Europe the mass concentrations are lowered, leading to a larger underestimation of observations. Aerosol optical depth (AOD) is generally slightly increased except in the northern high latitudes. This brings the simulated annual global mean AOD closer to the observational estimate. However, as the increase is rather uniform, biases tend to be reduced only in regions where the model underestimates the AOD. Furthermore, the correlations with satellite retrievals and ground-based sun-photometer observations of AOD are improved. Although the process-based approach to SOA formation causes a reduction in model performance in some areas, overall the new scheme improves the simulated aerosol fields.</p>https://gmd.copernicus.org/articles/15/683/2022/gmd-15-683-2022.pdf |
| spellingShingle | T. Bergman T. Bergman R. Makkonen R. Makkonen R. Schrödner R. Schrödner E. Swietlicki V. T. J. Phillips P. Le Sager T. van Noije Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2 Geoscientific Model Development |
| title | Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2 |
| title_full | Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2 |
| title_fullStr | Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2 |
| title_full_unstemmed | Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2 |
| title_short | Description and evaluation of a secondary organic aerosol and new particle formation scheme within TM5-MP v1.2 |
| title_sort | description and evaluation of a secondary organic aerosol and new particle formation scheme within tm5 mp v1 2 |
| url | https://gmd.copernicus.org/articles/15/683/2022/gmd-15-683-2022.pdf |
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