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  Sea salt emission, transport and influence on size-segregated nitrate simulation: a case study in northwestern Europe by WRF-Chem

Chen, Y., Cheng, Y., Ma, N., Wolke, R., Nordmann, S., Schuettauf, S., et al. (2016). Sea salt emission, transport and influence on size-segregated nitrate simulation: a case study in northwestern Europe by WRF-Chem. Atmospheric Chemistry and Physics, 16(18), 12081-12097. doi:10.5194/acp-16-12081-2016.

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Chen, Ying1, Author              
Cheng, Y.1, Author              
Ma, N.1, Author              
Wolke, Ralf2, Author
Nordmann, Stephan2, Author
Schuettauf, Stephanie2, Author
Ran, Liang2, Author
Wehner, Birgit2, Author
Birmili, Wolfram2, Author
van der Gon, Hugo A. C. Denier2, Author
Mu, Qing2, Author
Barthel, Stefan2, Author
Spindler, Gerald2, Author
Stieger, Bastian2, Author
Mueller, Konrad2, Author
Zheng, Guang-Jie2, Author
Pöschl, U. J.1, Author              
Su, H.1, Author              
Wiedensohler, Alfred2, Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2external, ou_persistent22              

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 Abstract: Sea salt aerosol (SSA) is one of the major components of primary aerosols and has significant impact on the formation of secondary inorganic particles mass on a global scale. In this study, the fully online coupled WRF-Chem model was utilized to evaluate the SSA emission scheme and its influence on the nitrate simulation in a case study in Europe during 10-20 September 2013. Meteorological conditions near the surface, wind pattern and thermal stratification structure were well reproduced by the model. Nonetheless, the coarse-mode (PM1-10) particle mass concentration was substantially overestimated due to the overestimation of SSA and nitrate. Compared to filter measurements at four EMEP stations (coastal stations: Bilthoven, Kollumerwaard and Vredepeel; inland station: Melpitz), the model overestimated SSA concentrations by a factor of 8-20. We found that this overestimation was mainly caused by overestimated SSA emissions over the North Sea during 16-20 September. Over the coastal regions, SSA was injected into the continental free troposphere through an "aloft bridge" (about 500 to 1000m above the ground), a result of the different thermodynamic properties and planetary boundary layer (PBL) structure between continental and marine regions. The injected SSA was further transported inland and mixed downward to the surface through downdraft and PBL turbulence. This process extended the influence of SSA to a larger downwind region, leading, for example, to an overestimation of SSA at Melpitz, Germany, by a factor of similar to 20. As a result, the nitrate partitioning fraction (ratio between particulate nitrate and the summation of particulate nitrate and gas-phase nitric acid) increased by about 20% for the coarse-mode nitrate due to the overestimation of SSA at Melpitz. However, no significant difference in the partitioning fraction for the fine-mode nitrate was found. About 140% overestimation of the coarse-mode nitrate resulted from the influence of SSA at Melpitz. In contrast, the overestimation of SSA inhibited the nitrate particle formation in the fine mode by about 20% because of the increased consumption of precursor by coarse-mode nitrate formation.

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 Dates: 2016
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: ISI: 000385376400003
DOI: 10.5194/acp-16-12081-2016
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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : European Geosciences Union
Pages: - Volume / Issue: 16 (18) Sequence Number: - Start / End Page: 12081 - 12097 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016