ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-1023-2011 Modelling of marine base cation emissions, concentrations and deposition in the UK Werner M. 1 Kryza M. 1 Dore A. J. 2 Blaś M. 2 Hallsworth S. 2 Vieno M. 2 3 Tang Y. S. 3 Smith R. I. 3 Department of Climatology and Atmosphere Protection, University of Wroclaw, Poland Centre for Ecology and Hydrology, UK School of GeoScience, University of Edinburgh, UK 04 02 2011 11 3 1023 1037 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/1023/2011/acp-11-1023-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/1023/2011/acp-11-1023-2011.pdf

Base cations exert a large impact on various geochemical and geophysical processes both in the atmosphere and at the Earth surface. One of the essential roles of these compounds is impact on surface pH causing an increase in alkalinity and neutralizing the effects of acidity generated by sulphur and nitrogen deposition. During recent years anthropogenic emissions of base cations in the UK have decreased substantially, by about 70%, 78%, 75% and 48% for Na<sup>+</sup>, Mg<sup>2+</sup>, Ca<sup>2+</sup> and K<sup>+</sup>, respectively, over the period 1990–2006. For the island regions, such as the UK, the main source of base cation particles is the aerosol produced from the sea surface. Here, the sea salt aerosol (SSA) emissions are calculated with parameterisations proposed by Mårtensson et al. (2003) for ultra fine particles, Monahan et al. (1986) for fine particles and Smith and Harisson (1998) for coarse particles continuously with a 0.1 μm size step using WRF-modelled wind speed data at a 5 km × 5 km grid square resolution with a 3 h time step for two selected years 2003 and 2006. SSA production has been converted into base cation emissions, with the assumption that the chemical composition of the particle emitted from the sea surface is equal to the chemical composition of sea water, and used as input data in the Fine Resolution Atmospheric Multi-pollutant Exchange Model (FRAME). FRAME model annual mean concentrations and total wet deposition at a 5 km × 5 km grid resolution, are compared with concentrations in air and wet deposition from the National Monitoring Network and measurements based estimates of UK deposition budget. The correlation coefficient for wet deposition achieves high values (<i>R</i> = 0.8) for Na<sup>+</sup> and Mg<sup>2+</sup>, whereas for Ca<sup>2+</sup> the correlation is poor (<i>R</i> < 0.3). Base cation concentrations are also represented well, with some overestimations on the west coast and underestimations in the centre of the land.

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