TY  - JOUR
A1  - Dube, Jonas
A1  - Böckmann, Christine
A1  - Ritter, Christoph
T1  - Lidar-Derived Aerosol Properties from Ny-Ålesund, Svalbard during the MOSAiC Spring 2020
JF  - Remote sensing / Molecular Diversity Preservation International (MDPI)
N2  - 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-Alesund 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 Angstrom 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 approximate to 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 approximate to 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.
KW  - aerosol
KW  - Arctic haze
KW  - lidar
KW  - microphysical properties
KW  - backtrajectories;
KW  - Ny-Alesund
KW  - Svalbard
KW  - MOSAiC
KW  - aerosol-boundary layer interactions
Y1  - 2022
U6  - https://doi.org/10.3390/rs14112578
SN  - 2072-4292
VL  - 14
IS  - 11
PB  - MDPI
CY  - Basel
ER  -