Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub>
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO<sub>3</sub> concentrations above a few tenths of a ppb can cause substantial increases in haze mode particle concentration...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2004-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/4/549/2004/acp-4-549-2004.pdf |
| _version_ | 1818049021081550848 |
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| author | S. Romakkaniemi H. Kokkola A. Petzold A. Laaksonen |
| author_facet | S. Romakkaniemi H. Kokkola A. Petzold A. Laaksonen |
| author_sort | S. Romakkaniemi |
| collection | DOAJ |
| description | The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO<sub>3</sub> concentrations above a few tenths of a ppb can cause substantial increases in haze mode particle concentrations at relative humidities at about 60% and above. The effect can be strongly magnified when letovicite particles are present in addition to sulfuric acid aerosols. Letovicite particles are less acidic than the sulfuric acid particles and so more nitric acid can be absorbed. This effect can be seen even at RH below 50% due to the lowering of the deliquescence RH of letovicite in the presence of gaseous nitric acid at low temperatures. We have also compared equilibrium calculations of the HNO<sub>3</sub> effect with observations of increased haze mode concentrations at relative humidities above 50% (Petzold et al., 2000). Nitric acid mixing ratios on the order of 0.5-2ppb may explain the observed increase of haze mode particles at least partially. |
| first_indexed | 2024-12-10T10:30:57Z |
| format | Article |
| id | doaj.art-5053e50f5de14f30981be3a52138bcbe |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-10T10:30:57Z |
| publishDate | 2004-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-5053e50f5de14f30981be3a52138bcbe2022-12-22T01:52:35ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242004-01-0142549556Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub>S. RomakkaniemiH. KokkolaA. PetzoldA. LaaksonenThe effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO<sub>3</sub> concentrations above a few tenths of a ppb can cause substantial increases in haze mode particle concentrations at relative humidities at about 60% and above. The effect can be strongly magnified when letovicite particles are present in addition to sulfuric acid aerosols. Letovicite particles are less acidic than the sulfuric acid particles and so more nitric acid can be absorbed. This effect can be seen even at RH below 50% due to the lowering of the deliquescence RH of letovicite in the presence of gaseous nitric acid at low temperatures. We have also compared equilibrium calculations of the HNO<sub>3</sub> effect with observations of increased haze mode concentrations at relative humidities above 50% (Petzold et al., 2000). Nitric acid mixing ratios on the order of 0.5-2ppb may explain the observed increase of haze mode particles at least partially.http://www.atmos-chem-phys.net/4/549/2004/acp-4-549-2004.pdf |
| spellingShingle | S. Romakkaniemi H. Kokkola A. Petzold A. Laaksonen Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub> Atmospheric Chemistry and Physics |
| title | Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub> |
| title_full | Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub> |
| title_fullStr | Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub> |
| title_full_unstemmed | Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub> |
| title_short | Growth of upper tropospheric aerosols due to uptake of HNO<sub>3</sub> |
| title_sort | growth of upper tropospheric aerosols due to uptake of hno sub 3 sub |
| url | http://www.atmos-chem-phys.net/4/549/2004/acp-4-549-2004.pdf |
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