Details for Seasonal Characteristics of the physicochemical properties of the North Atlantic marine atmospheric

Name:Seasonal Characteristics of the physicochemical properties of the North Atlantic marine atmospheric
Description:Yoon, Y.J., D. Ceburnis, F. Cavalli, O. Jourdan, J.P. Putaud, M.C. Facchini, S. Descari, S. Fuzzi, , S.G. Jennings, C.D. O’Dowd. Seasonal characteristics of the physico-chemical properties of North Atlantic marine atmospheric aerosols J. Geophys. Res., doi:10.1029/2005JD007044, 2007.



Seasonal physicochemical characteristics of North Atlantic marine aerosols are presented for the period from January 2002 to June 2004. The aerosol size distribution modal diameters show seasonal variations, 0.031 mm in winter and 0.049 mm in summer for the Aitken mode and 0.103 mm in winter and 0.177 mm in summer for the accumulation mode. The accumulation mode mass also showed a seasonal variation, minimum in winter and maximum in summer. A supermicron sized particle mode was found at 2 mm for all seasons showing 30% higher mass concentration during winter than summer resulting from higher wind speed conditions. Chemical analysis showed that the concentration of sea salt has a seasonal pattern, minimum in summer and maximum in winter because of a dependency of sea-salt load on wind speeds. By contrast, the nonsea-salt (nss) sulphate concentration in fine mode particles exhibited lower values during winter and higher values during midsummer. The water soluble organic carbon (WSOC) and total carbon (TC) analysis also showed a distinctive seasonal pattern. The WSOCconcentration during the high biological activity period peaked at 0.2 mgC m3, while it was lower than 0.05 mgC m3 during the low biological activity period. The aerosol light scattering coefficient showed a minimum value of 5.5 Mm1 in August and a maximum of 21 Mm1 in February. This seasonal variation was due to the higher contribution of sea salt in the MBL during North Atlantic winter. By contrast, aerosols during late spring and summer exhibited larger angstrom parameters than winter, indicating
a large contribution of the biogenically driven fine or accumulation modes. Seasonal characteristics of North Atlantic marine aerosols suggest an important link between marine aerosols and biological activity through primary production of marine aerosols.

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