The impact of temperature on the properties of atmospheric particles

PhD defence, Thursday 11 October 2018. Louise Normann Jensen.

2018.10.11 | Olivia Elsebeth Belling-Nami

Louise Normann Jensen.

At most places the air is full of microscopic particles, many of which arise from human activities. In this PhD project the effect of temperature during particle formation and the effect of subsequently exposing the particles to changes in temperature are investigated in a new simulation chamber of five cubic meters: the Aarhus University Research on Aerosol (AURA) chamber.  Focus is on atmospheric relevant particles formed by reacting α-pinene with ozone. α-pinene is naturally emitted from, and has the smell of, coniferous trees, while ozone at lower atmospheric altitudes is a typical pollutant from human activities. The experiments conducted between -15 and 20 ˚C show that temperature is important for the particle number concentration, size, chemical composition, and viscosity - properties being significant for the climate effect of the particles. The properties of the particles are only slightly affected by exposure to temperature changes after their initial formation.  

The PhD degree was completed at the department of Chemistry, Science and Technology, Aarhus University.

This résumé was prepared by the PhD student.


Time: Thursday 11 October 2018 at 13.00

Place: Building 1533, room 012, Lecture Theatre, iNANO, Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus

Title of PhD thesis: Effects of temperature, relative humidity and loading on the properties of α-pinene derived secondary organic aerosol.

Contact information: Louise Normann Jensen, e-mail:

Members of the assessment committee:

Professor Annele Virtanen, Department of Applied Physics, University of Eastern Finland.

Professor Hans Christen Hansson, Department of Environmental Science and Analytical Chemistry, Stockholm University.

Professor Henrik Stapelfeldt, Department of Chemistry, Aarhus University (chair)

Main supervisor: Professor Merete Bilde, Department of Chemistry, Aarhus Universitet

Language: The PhD dissertation will be defended in English


The defence is public.

The PhD thesis is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, buildings 1520 and 1521, 8000 Aarhus C.

PhD defence
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Olivia Elsebeth Belling-Nami

Revised 22.10.2018