With accelerated warming in the Arctic, dust emissions from expanding glacial outwash plains could impact cloud formation and radiative transfer, but high latitude dust sources remain poorly characterized. We present ice nucleating particle (INP) experiments from samples collected in glacial outwash plains in southern and western Greenland, including surface sediment sample transects and atmospheric filter samples. Surface sediment samples show comparable ice-active mass site densities to other high-latitude sites, exceeding typical desert dust, and variability in ice-activity is likely linked to total organic carbon content. These findings provide new insights into INPs in glacial outwash plains, with possible climate implications.

Aerosols from the natural sources of air pollution reduce air quality at high latitudes. Many extreme events causing severe air pollution were observed/measured in Iceland, Svalbard and Antarctica. In Iceland, we measured i. tens of severe dust storms when the instruments reached 150 mgm-3, as well as long-range transport from Iceland to Scandinavia, Faroe and British Isle, and Svalbard; ii. at least two Saharan dust with PM10>200 ugm-3, and iii. Black/Organic Carbon haze from burning mosses around the hot lava from the eruption in Reykjanes Peninsula with reduced visibility and smoke smell, particles>1 µm. PM1 mass concentrations exceeded 25 µgm-3.

This study investigates the impact of Light Absorbing Aerosols (LAAs) on atmospheric heating rates (HR) in the Arctic. A novel approach was used to estimate LAA-induced atmospheric HR for the first time at a fixed sampling point, using high temporal resolution measurements performed at Ny-Ålesund through 2022. Our results show a significant decrease in reflected radiation-HR, a decrease in diffuse radiation-HR, and the total HR almost equal to previous estimates.. Additionally, were analyzed both BC and HR sources and species apportionment. This study provides a crucial contribution to understanding LAAs' effects on atmospheric HR and their role in Arctic Amplification.

Measurements were made of refractory black carbon with an extended range, single particle soot photometer, Droplet Measurement Technologies, LLC), at the Pituffik Space Base in northern Greenland, during the summer and autumn of 2024. The SP2XR measures light scattered from particles in the equivalent optical diameter (EOD) range from 100-500 nm, and mass concentration of rBC in the mass equivalent diameter (MED) range from 50 – 800 nm. In addition, an equivalent coating thickness is extracted, calculated from the EOD and MED. Measurements are being compared to a global reanalysis model and atmospheric backtrajectories to determine primary transport pathways.

Comprehensive BC source studies in the Arctic atmosphere require large spatial and temporal scales. High temporal-resolution, one-year-long BC measurements during the MOSAiC expedition in the Central Arctic are expended on simultaneous BC observations at Western and European Arctic sections; the Arctic spatiotemporal BC distribution and episodes of the highest pollution are highlighted. BC origin and main contributing sources are assessed for each location using FLEXPART driven with ECLIPSE-GFAS emission inventories. Combined geospatial view provides the contributions of dominated gas flaring, domestic and transport sectors from populated regions in the cold period and biomass burning from wildfires in the warm period.

Aerosols in cold regions impact climate by altering snow properties and accelerating melting. This study presents direct measurements of particle number fluxes and dry deposition velocities at two Arctic sites: Ny-Ålesund (March–August 2021) and Fairbanks (winter 2022, ALPACA experiment). An eddy covariance system measured ultrafine to quasi-coarse particles. Results highlight turbulence-driven deposition, with friction velocity influencing deposition velocity. Comparison with predictive models shows agreement with Slinn (1982), but current parameterizations underestimate fluxes for 0.5–3 µm particles. Findings enhance understanding of aerosol-snow interactions and improve dry deposition modeling in polar environments.