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Investigations of atmospheric aerosols and their characterization over the Arctic during summer season (Aerosol study over Arctic)

Polar regions hold an important place while answering the key questions about the global climate change. The role of atmospheric aerosols in producing the ‘Arctic haze’ and associated phenomenon is well recognized. In view of reports on thinning of Arctic sea ice and phenomenon like Arctic haze due to increase in the industrialization in norther

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Project date

Starts
2010-06-01

Ends
2012-09-30

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Project Keywords

  • atmosphere / aerosols / aerosol optical depth/thickness
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Summary

Polar regions hold an important place while answering the key questions about the global climate change. The role of atmospheric aerosols in producing the ‘Arctic haze’ and associated phenomenon is well recognized. In view of reports on thinning of Arctic sea ice and phenomenon like Arctic haze due to increase in the industrialization in northern hemisphere, there is an increased need for a better understanding of aerosol properties as well as aerosol interaction with radiation in the Arctic regions. Arctic atmosphere is impacted by long range transport of dust and also from the emissions from mid latitude regions. Characterization of absorbing aerosols over high reflecting surfaces of snow and ice in Arctic are important, as they can reduce the surface albedo, thereby perturbing the radiation balance of Earth atmosphere system. Despite the increase in our understanding of the polar aerosols, information based on measurement data are scarce and validation of model results is a challenge. Arctic atmosphere is isolated from lower latitudes by the polar front during summer season, making it as the ideal season to study the background aerosols loading over the ice sheet. As absorption of sunlight by black carbon aerosol results in heating of the atmosphere, it also demands for the measurements during summer time when sunlight is available for the 24hrs. Spectral AOD measurements also need solar visibility. With the above background knowledge project envisages quantification of the physical and optical properties of the aerosols and associated processes during the summer season by using different aerosol instruments and use them to estimate the aerosol radiative forcing over that region. The proposed work will lead to the generation and availability of aerosol database which can be a very important contribution to the Arctic aerosol science. In addition to the extensive measurements of different parameters of aerosols, collection of fresh snow samples (if snow fall occurs in between) are also planned for quantifying the scavenging efficiency of snow. The main objectives of our study are- 1.To study the physical and optical properties of the aerosols and their inter annual variability by comparing with the earlier measurements. 2.To investigate the role of atmospheric aerosols on the incoming solar radiations. 3.To study the long range transport of the aerosols from the distinct regions of the Northern Hemisphere at low latitude to the high latitude 4.To quantify the anthropogenic influence in the Arctic atmosphere 5.To estimate the radiative forcing 6.To quantify the snow scavenging of aerosol

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