Abstract
An intense biomass-burning (BB) event from North America in July 2015 was observed over Ny-Ålesund (Spitsbergen, European Arctic). An extreme air pollution took place and aerosol optical depth (AOD) of more than 1 at 500nm occurs in middle and lower troposphere. We analyse data from the multi-wavelength Raman-lidar KARL of Alfred Wegener Institute to derive microphysical properties of the aerosol of one interesting layer from 3186 to 3306 m via regularization. We found credible and confidential microphysical parameters.
Highlights
The data for this work was obtained in NyÅlesund, Spitsbergen, in the European Arctic on 10 July 2015
For the inversion of the microphysics we selected an altitude range from 3186m to 3306m because a contemporaneous radiosonde showed a humidity about 80-85% and, we expected a larger effective radius and a lower refractive index (RI) as was reported for dry BB aerosol in literature
The retrieval by Truncated SVD (TSVD) was first done with a refractive index grid with a resolution of 40x40 points and a range for the Re of RI from 1.31.8 and for the imaginary part (Im) from 0-0.05
Summary
The data for this work was obtained in NyÅlesund, Spitsbergen, in the European Arctic on 10 July 2015. An intensive event of BB aerosol originating from the boreal North America was observed for several days around that period at different Arctic sites (Markowicz et al [1]) and produced an AOD(500) >1. Profiles of extinction and backscatter were obtained by the “3+2” Raman lidar KARL according to the method of Ansmann [2] with 10min / 30m resolution. This event of BB aerosol and the KARL lidar are described in [3]. Wandinger et al [4] derived for example effective radii of 0.25μm and RI of 1.56–1.66 for the real (Re) and 0.05i–0.07i for the imaginary part (Im)
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