Properties of arctic haze aerosol from lidar observations during iarea 2015 campaign on spitsbergen

Abstract

Arctic Haze event was observed on 5-8 April 2015 using simultaneously Near-range Aerosol Raman Lidar of IGFUW and Koldewey Aerosol Raman Lidar of AWI, both based at AWIPEV German-French station in Ny-Ålesund, Spitsbergen. The alterations in particle abundance and altitude of the aerosol load observed on following days of the event is analyzed. The daytime profiles of particle optical properties were obtained for both lidars, and then served as input for microphysical parameters inversion. The results indicate aerosol composition typical for the Arctic Haze. However, in some layers, a likely abundance of aqueous aerosol or black carbon originating in biomass burning over Siberia, changes measurably the Arctic Haze properties.

Properties of Saharan Dust Versus Local Urban Dust—A Case Study

“…Such properties are similar for the mixture of urban and Arctic aerosol reported (e.g. Müller et al., 2004; Stachlewska, Ritter, et al., 2018).…”

“…All profiles were obtained for cloud‐free atmosphere and calculated avoiding the periods of the depolarization calibration measurements. The WV measurements are taken only during the night to protect the detectors from strong background sunlight (Stachlewska, Samson, et al., 2018; Stachlewska, Ritter, et al., 2018).…”

“…Three laser beams are sent simultaneously and co‐axially into the atmosphere after they are expanded to a 45 mm diameter to decrease the beam divergence (0.2 mrad) and lower the output power (180/110/60 mJ at 1,064/532/355 nm). The backward scattered light is collected onto Newtonian reflectors; large one of 300 mm primary mirror, 0.9 mm pinhole (1 mrad narrow field of view; the PollyXT lidar; Engelmann et al., 2016) and small one of 50 mm primary mirror, 0.4 mm fiber‐core (2 mrad wide field of view; the Near‐range Aerosol Raman lidar—NARLa; Stachlewska, Ritter, et al., 2018). Lidars provide the so‐called 3 ß +2 a +2 d +WV data set, consisting respectively of three particle backscattering coefficients, two particle extinction coefficient, two particle linear depolarization ratios, and water‐vapor vertical profiles.…”