Details for Seasonal Variation of the Aerosol Light Scattering Coefficient in Marine Air of the Northeast Atlantic

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Name:Seasonal Variation of the Aerosol Light Scattering Coefficient in Marine Air of the Northeast Atlantic
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Aditya Vaishya, S. G. Jennings, and Colin O’Dowd. Seasonal Variation of the Aerosol Light Scattering Coefficient in Marine Air of the Northeast Atlantic, Advances in Meteorology, Volume 2011, Article ID 170490, doi:10.1155/2011/170490.


Abstract. Aerosol light scattering measurements were carried out using a TSI 3563 Nephelometer at the Mace Head Atmospheric Research Station, on the west coast of Ireland from year 2001–2010. A strong seasonal trend in the aerosol light scattering coefficient at 550nm (σscat), for clean marine air masses, is observed with a high σscat value, [average (geometric mean)] of 35.3Mm1(29.5Mm1), in January and a low σscat value of 13.7Mm1 (10.2Mm1), in July. This near threefold increase in the σscat value during the winter season is because of the large contribution of wind-speed generated sea-salt particles in the marine boundary layer. A high positive correlation coefficient of 0.82 was found between the percentage occurrence of relatively large A°ngstrom exponent (A° ) values (>1.2) and the percentage occurrence of lower σscat values (5–15Mm1) in the summer season. σscat and wind-speed have a high positive correlation coefficient of 0.88 whereas A° and wind-speed have a negative correlation coefficient of 0.89.values during the summer months indicate the dominance of sub-μm particles thus indicating the contribution of non-sea-salt sulphate and organics towards the σscat as these species show an enhanced concentration during the summer months.

 

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