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  Modelling the partitioning of ammonium nitrate in the convective boundary layer

Aan de Brugh, J. M. J., Henzing, J. S., Schaap, M., Morgan, W. T., van Heerwaarden, C. C., Weijers, E. P., Coe, H., & Krol, M. C. (2012). Modelling the partitioning of ammonium nitrate in the convective boundary layer. Atmospheric Chemistry and Physics, 12, 3005-3023. doi:10.5194/acp-12-3005-2012.

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アイテムのパーマリンク: https://hdl.handle.net/11858/00-001M-0000-000F-89D7-7 版のパーマリンク: https://hdl.handle.net/21.11116/0000-0003-CD62-8
資料種別: 学術論文

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acp-12-3005-2012.pdf (出版社版), 2MB
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https://hdl.handle.net/11858/00-001M-0000-0010-1876-D
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acp-12-3005-2012.pdf
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 作成者:
Aan de Brugh, J. M. J., 著者
Henzing, J. S., 著者
Schaap, M., 著者
Morgan, W. T., 著者
van Heerwaarden, C. C.1, 著者
Weijers, E. P., 著者
Coe, H., 著者
Krol, M. C., 著者
所属:
1Max Planck Research Group Turbulent Mixing Processes in the Earth System, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913573              

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 要旨: An explanatory model study is presented on semi-volatile secondary inorganic aerosols on three clear days in May 2008 during the IMPACT campaign at the Cabauw tower in the Netherlands. A single column model in combination with the equilibrium aerosol model ISORROPIA is used. This model uses surface observations from IMPACT and calculates the gas-aerosol partitioning of ammonium nitrate. The calculated gas-aerosol equilibrium overestimates the gas phase fraction during daytime, and overestimates the aerosol phase fraction during night-time. This discrepancy can partly be solved when the approach of the gas-aerosol equilibrium is forced to proceed with a delay timescale of up to two hours. Although it is shown that the delay itself has a small effect, the most important effect is caused by the mixing of air from higher altitudes at which the equilibrium is shifted to the aerosol phase. Thus, vertical mixing is shown to have a significant influence on the calculated partitioning at the surface. On some occasions, the correspondence to the observed partitioning improves dramatically.


Even though gas-aerosol partitioning of ammonium nitrate is not instantaneous, observations show that a different equilibrium in the upper boundary layer causes aerosol ammonium nitrate concentrations to increase with altitude. Our model calculates similar vertical gradients depending on the assumed speed of gas-aerosol equilibrium. The calculated optical properties of the aerosol show a similar behaviour. The aerosol optical properties depend on the aerosol size distribution both directly, because light scattering depends on particle size, and indirectly, because the equilibration timescale depends on the aerosol sizes. Future studies should therefore focus on a fully size-resolved treatment of the gas-aerosol partitioning.


Finally, coarser-resolution models may treat the gas-aerosol equilibrium of ammonium nitrate by calculating the equilibrium with a temperature and humidity sampled at a different altitude. We found that the equilibrium at an altitude of 200 m (night) up to 600 m (day) is representative for the partitioning of ammonium nitrate at the surface in the beginning of May 2008.

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言語: eng - English
 日付: 20122012
 出版の状態: 出版
 ページ: -
 出版情報: -
 目次: -
 査読: 査読あり
 識別子（DOI, ISBNなど）: DOI: 10.5194/acp-12-3005-2012
 学位: -

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出版物 1

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出版物名: Atmospheric Chemistry and Physics
種別: 学術雑誌
 著者・編者:
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出版社, 出版地: Katlenburg-Lindau, Germany : European Geosciences Union
ページ: - 巻号: 12 通巻号: - 開始・終了ページ: 3005 - 3023 識別子（ISBN, ISSN, DOIなど）: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016