2014 iAREA campaign on aerosol in Spitsbergen – Part 1: Study of physical and chemical properties

Abstract

h i g h l i g h t sComplex studies on aerosol properties during spring on Spitsbergen are presented. In-situ, remote sensing instruments and model results are included in the campaign. Scattering properties were found to be correlated with wind speed. Some sea-spray advections are detected and described in detail. Spring 2014 seems to be relatively clean with only a small load of Arctic Haze events. a r t i c l e i n f o . The subject of this study is to investigate the inesitu, passive and active remote sensing observations as well as numerical simulations to describe the temporal variability of aerosol singleescattering properties during spring season on Spitsbergen. The retrieval of the data indicates several event days with enhanced singleescattering properties due to the existence of sulphate and additional seaesalt load in the atmosphere which is possibly caused by relatively high wind speed. Optical results were confirmed by numerical simulations made by the GEMeAQ model and by chemical observations that indicated up to 45% contribution of the seaesalt to a PM 10 total aerosol mass concentration. An agreement between the in-situ optical and microphysical properties was found, namely: the positive correlation between aerosol scattering coefficient measured by the nephelometer and effective radius obtained from laser aerosol spectrometer as well as negative correlation between aerosol scattering coefficient and the Ångstrom exponent indicated that slightly larger particles dominated during special events. The inesitu surface observations do not show any significant enhancement of the absorption coefficient as well as the black carbon concentration which might occur during spring. All of extensive singleescattering properties indicate a diurnal cycle in Longyearbyen, where 21:00e5:00 data stays at the background level, however increasing during the day by the factor of 3e4. It is considered to be highly connected with local emissions originating in combustion, traffic and harbour activities. On the other hand, no daily fluctuations in NyeÅlesund are observed. Mean values in NyeÅlesund are equal to 8.2, 0.8 Mm À1 and 103 ng/m 3 for scattering, absorption coefficients and black carbon concentration;

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

“…Ny-Ålesund (78 • 55 25" N, 11 • 55 21" E) is a research town in the Oscar II Land on the island of Spitsbergen. The research stations are placed on the southern shore of Kongsfjorden [55]. Aerosol in situ measurements were made in the Gruvebadet laboratory (78.918 • N, 11.895 • E; 61 m a.s.l.…”

Impact of North American intense fires on aerosol optical properties measured over the European Arctic in July 2015

“…At the peak of the event (11 July) surface aerosol scattering and absorbing coefficients exceeded an extremely high value of 130 and 15 Mm À1 for 530 nm. Typical scattering coefficient in Ny-Ålesund is below 10 Mm À1 , while the absorbing coefficient is below 1 Mm À1 [Lisok et al, 2016]. SSA values were relatively constant and varied between 0.90 and 0.94, indicating moderate absorbing particles.…”

Ice-nucleating particle concentration measurements from Ny-Ålesund during the Arctic spring–summer in 2018

“…An Aerodynamic Particle Sizer (APS), model TSI 3321, was used for measuring the aerodynamic aerosol particle diameters between 0.5 and 20 µm in parallel with the SMPS. Both instruments were connected to a common stack inlet, where the WT-CRAFT filter sampler was deployed, and recorded data averaged over 10 min (Giardi et al, 2016;Lupi et al, 2016). The aerodynamic diameters measured by the APS were corrected to the volume-equivalent diameters using an average particle mass density of 1.95 g cm −3 , assuming a mixture of different substances based on the findings of Lisok et al (2016) and a dynamic shape factor of 1.…”

“…Both instruments were connected to a common stack inlet, where the WT-CRAFT filter sampler was deployed, and recorded data averaged over 10 min (Giardi et al, 2016;Lupi et al, 2016). The aerodynamic diameters measured by the APS were corrected to the volume-equivalent diameters using an average particle mass density of 1.95 g cm −3 , assuming a mixture of different substances based on the findings of Lisok et al (2016) and a dynamic shape factor of 1. The number concentration in the resulting overlapping range was taken from the SMPS data.…”