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@article{Graßl2024,

title = {From Polar Day to Polar Night: A Comprehensive Sun and Star Photometer Study of Trends in Arctic Aerosol Properties in Ny-Ålesund, Svalbard},

author = {Sandra Graßl and Christoph Ritter and Jonas Wilsch and Richard Herrmann and Lionel Doppler and Roberto Román},

url = {https://www.mdpi.com/2072-4292/16/19/3725},

doi = {10.3390/rs16193725},

issn = {2072-4292},

year  = {2024},

date = {2024-07-22},

urldate = {2024-01-01},

journal = {Remote Sensing},

volume = {16},

number = {19},

abstract = {The climate impact of Arctic aerosols, like the Arctic Haze, and their origin are not fully understood. Therefore, long-term aerosol observations in the Arctic are performed. In this study, we present a homogenised data set from a sun and star photometer operated in the European Arctic, in Ny-Ålesund, Svalbard, of the 20 years from 2004–2023. Due to polar day and polar night, it is crucial to use observations of both instruments. Their data is evaluated in the same way and follows the cloud-screening procedure of AERONET. Additionally, an improved method for the calibration of the star photometer is presented. We found out, that autumn and winter are generally more polluted and have larger particles than summer. While the monthly median Aerosol Optical Depth (AOD) decreases in spring, the AOD increases significantly in autumn. A clear signal of large particles during the Arctic Haze can not be distinguished from large aerosols in winter. With autocorrelation analysis, we found that AOD events usually occur with a duration of several hours. We also compared AOD events with large-scale processes, like large-scale oscillation patterns, sea ice, weather conditions, or wildfires in the Northern Hemisphere but did not find one single cause that clearly determines the Arctic AOD. Therefore the observed optical depth is a superposition of different aerosol sources.},

keywords = {aerosol optical depth, Angstrom Exponent, Arctic Haze, long-range transport, long-term AOD observations, polar aerosol, seasonal trends},

pubstate = {published},

tppubtype = {article}

}

@article{zielinski2020studyb,

title = {Study of Chemical and Optical Properties of Biomass Burning Aerosols during Long-Range Transport Events toward the Arctic in Summer 2017},

author = {Tymon Zielinski and Ezio Bolzacchini and Marco Cataldi and Luca Ferrero and Sandra Graßl and Georg Hansen and David Mateos and Mauro Mazzola and Roland Neuber and Paulina Pakszys and Michal Posyniak and Christoph Ritter and Mirko Severi and Piotr Sobolewski and Rita Traversi and Cristian Velasco-Merino },

doi = {https://doi.org/10.3390/atmos11010084},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Atmosphere},

volume = {11},

number = {1},

pages = {84},

publisher = {Multidisciplinary Digital Publishing Institute},

keywords = {aerosol, aerosol optical depth, artic, biomass burning, long-range transport},

pubstate = {published},

tppubtype = {article}

}

@article{Velasco2017ACPD,

title = {Impact of long-range transport over the Atlantic Ocean on Saharan dust optical and microphysical properties},

author = {C. Velasco-Merino, D. Mateos, C. Toledano, J. Prospero, J. Molinie, L. Euphrasie-Clotilde, R. González, V.E. Cachorro, A. Calle and A. M. de Frutos},

url = {https://www.atmos-chem-phys-discuss.net/acp-2017-1089/acp-2017-1089.pdf},

doi = {https://doi.org/10.5194/acp-2017-1089},

year  = {2017},

date = {2017-01-01},

journal = {Atmospheric Chemistry and Physics Discussion},

keywords = {AERONET, aerosol climatology, aerosol optical depth, long-range transport, microphysical properties, Saharan mineral dust, sun photometry},

pubstate = {published},

tppubtype = {article}

}