Details for Seasonal variation of the aerosol light scattering coefficient in marine air of the North-East Atlan

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Name:Seasonal variation of the aerosol light scattering coefficient in marine air of the North-East Atlan
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Vaishya, A., S.G. Jennings and C.D. O'Dowd, Seasonal variation of the aerosol light scattering coefficient in marine air of the North-East Atlantic, Adv. Met., Volume 2011, Article ID 170490, doi:10.1155/2011/170490, 2011.

 

  


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° ngstro¨m 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 °Aand wind-speed have a negative correlation coefficient of 0.89. °A 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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