Welcome to NOSA Symposium 2022 webpage!

All information and links regarding the NOSA symposium 2022, can be found here.Registration to the conference is free of charge and open throughout the conference at:https://forms.gle/UPw1pcTjPJGpT5gr9

The NOSA symposium 2022 schedule has been published. It can be found using the link: NOSA 2022 schedule

Abstracts for the NOSA 2022 symposium can be found using the link: NOSA abstracts

Link to the conference venue: https://app.gather.town/events/dEe4a6EMN7j1UUoLDEv9

Keynotes

Heikki Junninen: COVID19 – possibility or distraction for aerosol scientists?Trude Storelvmo: Aerosol Effective Radiative Forcing – AR6 updates and remaining knowledge gaps

Tutorials

Pavla Dagsson-Waldhauserova:

Talk Title: How does High Latitude Dust affect the air quality and climate in the Arctic and Antarctica?

High Latitude Dust (HLD) contributes 5% to the global dust budget and active HLD sources cover > 500,000 km2 worldwide, with Iceland being the largest European desert with an area of 44,000 km2. Recent studies have shown that Icelandic dust travels to other countries and reaches the high Arctic (N>80°). HLD was recognized as an important climate driver in Polar Regions in the IPCC Special Report on the Ocean and Cryosphere in a Changing Climate in 2019.

In situ dust measurements from Icelandic desert storms revealed high particulate matter (PM) concentrations, with one-minute PM10 means exceeding 50,000 ug m-3 and ten-minutes PM10 means in James Ross Island, Antarctica exceeding 120 ug m-3. The Icelandic dust has impacts on air quality, atmosphere, cryosphere, marine, and terrestrial environments, decreases albedo of both ice and snow as well as mixed-phase clouds via reduction in supercooled water content.

Fabian Mahrt

Talk Title: Phase behavior in organic aerosol mixtures is driven by difference in oxygen-to-carbon ratio of components

Primary organic aerosol (POA) and secondary organic aerosol (SOA) make up ~20-90% of the mass fraction of tropospheric aerosol. Knowledge about the phase behavior in internal mixtures containing SOA is needed to represent SOA formation in the atmosphere and predict their impact on air quality and climate. For POA+SOA particles it is often assumed that SOA formation is enhanced due to lowered activities in the organic aerosol phase and that the presence of POA has a smaller effect on the formation of SOA mass in the case of phase-separated POA+SOA particles.

In this work, we observed the phase behavior of individual particles in mixtures of different aerosol materials using fluorescence microscopy. We showed that for POA+SOA and for SOA+SOA particles, the difference in O/C ratio can be a good predictor for whether one- or two-phase particles form. Also, when adding secondary inorganic aerosol (SIA) we find that three phases can coexist in POA+SOA+SIA particles.