Measurements of the number concentration and size distribution of aerosol particles in the size range of 0.5–20 μm diameter were made with an aerodynamic particle sizer at an Arctic site at Ny-Alesund, Svalbard in August–September 2007 during the International Polar Year 2007–2008. Data are analyzed to study the aerosol number concentration–wind speed relationships. The sea-salt particles of marine origin generated within the Arctic circle are identified as the main source of the Arctic summer aerosols. Total number concentration of aerosol particles increases with increase in wind speed, the increase being more when winds from open leads over the oceanic sector are reaching the station as compared to when winds from pack ice in other directions are reaching the station. The larger increase with winds from the oceanic sector is attributed to the enhanced bubble-breaking activity and increased entrainment of dimethyl sulphide particles at the sea surface. Although, the increase in total aerosol number concentration associated with the winds from the oceanic sector is spread over the whole range of particle sizes, the increase in coarse mode particles is more prominent than that in the accumulation mode particles. The age of airmass over pack ice is also an important factor to determine the aerosol concentration over the Arctic region. The process of rainout/washout of the aerosol particles due to drizzle/snowfall is an effective sink mechanism in the Arctic environment. The aerosol particle concentration starts decreasing within a few minutes from the start of these events but requires a few hours to restore to the normal background aerosol level after the end of event.
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Acknowledgements
The authors express their gratitude to the Director, Indian Institute of Tropical Meteorology, Pune and National Centre for Antarctic and Ocean Research, Goa for participation in the first Indian Arctic expedition. The meteorological data provided by the Alfred Wegener Institute (AWI) is thankfully acknowledged. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and READY website (http://www.arl.noaa.gov/ready.html) used in this publication. AKK is thankful for financial support under the INSA Senior Scientist programme.
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DESHPANDE, C.G., KAMRA, A.K. Physical properties of the arctic summer aerosol particles in relation to sources at Ny-Alesund, Svalbard. J Earth Syst Sci 123, 201–212 (2014). https://doi.org/10.1007/s12040-013-0373-0
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DOI: https://doi.org/10.1007/s12040-013-0373-0