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Atmospheric Aerosols Studies over Arctic: Initiatives for Long Term Data and Preliminary Results

140.00

Description

After the launch of Indian Arctic Expedition and establishment of the Indian station Himadri (78o9’N, 11o9’E; Ny Ålesund, Svalbard) in Year 2007, during the International Polar Year (IPY), there were scattered measurements of atmospheric aerosols by few Indian groups which generated data (only summer months) but planned measurements and long term data were lacking. Keeping all the information and knowledge gaps in the background and taking cue from a month-long campaign-based measurements during the 4th Indian Arctic Expedition, 2010, from Gruvebadet (a place slightly away from Himadri and also away from the town area of Ny Ålesund), a long term measurement programme was formulated and executed during the 5th Indian Arctic Expedition. This involves continuous measurements of distinct aerosol properties round the year from Gruvebadet, with intense measurements during the summer months. Measurements of black carbon (BC) mass concentration, scattering coefficient (σsc) of aerosols are being made continuously while the total mass concentration (MT) of composite aerosols, columnar aerosol optical depth (AOD) and number size distributions (NSD) were made during the summer months. These measurements generated year round data from the Arctic, the first effort of India for any polar region (Arctic and Antarctic). These data have added to the already existing database of the Arctic and at the same time, preliminary analysis provides many new insights. This includes the effect of local activities on the aerosol within boundary layer, giving a weak diurnal variation with daytime high concentrations of BC, AOD, MT, BC and σsc showed a slight decreasing trend from June to August, indicating the pristine nature of Arctic atmosphere during summer.

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