Abstract
In the beginning of March 2018, Lidar measurements were performed on Svalbard, Arctic Ocean, in order to analyse the optical and hygroscopic properties of Arctic aerosol. In this study, aerosol backscatter showed significant higher values in lower altitudes. The analysis of the Colour Ratio (CR) revealed smaller particles in lower altitudes, with larger particles appearing only above Investigation of the hygroscopic character was done by applying the growth parameter introduced by Gassó et al. (2000). It was found that the method of Zieger et.al. (2010) can be successfully extended to backscatter and CR data from Lidar measurements. Ice nucleation was examined in ice supersaturation conditions, with no ice cloud formation observed. This indicated that the role of Arctic aerosol as ice nuclei is still a poorly understood issue.
Highlights
During springtime, aerosol containing air masses are transported into the Arctic troposphere, forming the Arctic Haze
The phenomenon of Arctic Amplification describes the increase of nearsurface temperature in Arctic regions compared to lower latitudes [5]
Since the particle’s size was not available by Lidar data, the application of the growth function was extended to backscatter and Colour Ratio (CR) data. This modification was associated with the dependency of backscattering and CR on relative humidity (RH)
Summary
Aerosol containing air masses are transported into the Arctic troposphere, forming the Arctic Haze. [1] Arctic Haze lasts from February to April with its peak in March [2]. Arctic is a sensitive area experiencing significant changes in the radiation budget [4]. The phenomenon of Arctic Amplification describes the increase of nearsurface temperature in Arctic regions compared to lower latitudes [5]. Increasing temperature leads to an earlier melting of sea ice and to a smaller albedo [6]. Since aerosol contribution to Arctic Amplification is not fully understood, it is important to analyse the optical, microphysical and hygroscopic properties of Arctic aerosol especially during the Haze period [7], [8] and [9]
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