Abstract:
We discuss the results of spectral measurements of aerosol optical depth (AOD) of the atmosphere, carried out in warm periods of 2011–2016 in the Arctic settlement Barentsburg (Spitsbergen Archipelago). The statistical characteristics of seasonal and interannual variations in atmospheric AOD in the wavelength range 0.34–2.14 μm are presented. The average AOD (0.5 μm) for the six-year period of observations had been 0.086, including the fine-mode AOD component 0.062 and coarse-mode AOD component 0.024. It is shown that the seasonal variations were best manifested in the decrease in modal (most probable) values of fine-mode AOD component from 0.055 in spring to 0.025 in autumn. As compared to the preceding (pre-2011) period, we noted a closer correspondence in the average AOD values between spring and summer, primarily due to a decreasen the content of fine-mode aerosol in spring and its increase in summer. The summertime AOD growth is most likely due to episodic outflows of smoke aerosol from boreal zones of Eurasia and North America.
Keywords:
aerosol optical depth, Spitsbergen
References:
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