NDLI: Lidar-Derived Aerosol Properties from Ny-Ålesund, Svalbard during the MOSAiC Spring 2020

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Lidar-Derived Aerosol Properties from Ny-Ålesund, Svalbard during the MOSAiC Spring 2020

Content Provider	MDPI
Author	Christine, Böckmann Dube, Jonas Ritter, Christoph
Copyright Year	2022
Abstract	In this work, we present Raman lidar data (from a Nd:YAG operating at $355$ nm, $532$ nm and $1064$ nm) from the international research village Ny-Ålesund for the time period of January to April 2020 during the Arctic haze season of the MOSAiC winter. We present values of the aerosol backscatter, the lidar ratio and the backscatter Ångström exponent, though the latter depends on wavelength. The aerosol polarization was generally below 2%, indicating mostly spherical particles. We observed that events with high backscatter and high lidar ratio did not coincide. In fact, the highest lidar ratios (LR > 75 sr at $532$ nm) were already found by January and may have been caused by hygroscopic growth, rather than by advection of more continental aerosol. Further, we performed an inversion of the lidar data to retrieve a refractive index and a size distribution of the aerosol. Our results suggest that in the free troposphere (above ≈2500 m) the aerosol size distribution is quite constant in time, with dominance of small particles with a modal radius well below $100$ nm. On the contrary, below ≈2000 m in altitude, we frequently found gradients in aerosol backscatter and even size distribution, sometimes in accordance with gradients of wind speed, humidity or elevated temperature inversions, as if the aerosol was strongly modified by vertical displacement in what we call the “mechanical boundary layer”. Finally, we present an indication that additional meteorological soundings during MOSAiC campaign did not necessarily improve the fidelity of air backtrajectories.
Starting Page	2578
e-ISSN	20724292
DOI	10.3390/rs14112578
Journal	Remote Sensing
Issue Number	11
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2022-05-27
Access Restriction	Open
Subject Keyword	Remote Sensing Atmospheric Sciences Aerosol Arctic Haze Lidar Microphysical Properties Backtrajectories Ny-ålesund Svalbard Mosaic Aerosol-boundary Layer Interactions
Content Type	Text
Resource Type	Article

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