Johan Ström

Professor
Room: X215
Phone: +46 8 674 7287
Johan.Strom@aces.su.se

About me

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My research deals with the life-cycle of atmospheric aerosols and
their interactions with clouds.

 

There are two main motivations for studying aerosols and clouds.
One, there is a concern that particles, especially in urban areas, are
harmful to humans. Two, aerosols is a very important component in our
climate system and any changes in the properties of the aerosol may affect the
climate. The importance of aerosols, in terms of an impact on the climate, is on
the same scale as the greenhouse effect by increasing carbon dioxide.

 

Particles are formed, transformed and eventually removed from the
atmosphere. The processes controlling these steps of the life-cycle are what we
study. We do this by simulating processes in numerical models or observing
aerosol and cloud properties at different locations and environments around the
world covering the altitude range from the ocean surface up to, and even into,
the stratosphere using aircraft.  Often our research is conducted as part of
international projects.

 

 

My own honest motivation for studying aerosols and clouds is
simply because I’m curious about how it all works. Think of it, an aerosol is so
small that it is barely visible in a microscope, but yet it influences cloud
systems so large that they can only be seen in its entire from space.

Latest scientific papers

Multi-seasonal ultrafine aerosol particle number concentration measurements at the Gruvebadet observatory, Ny-lesund, Svalbard Islands

Lupi, A; Busetto, M; Becagli, S; Giardi, F; Lanconelli, C; Mazzola, M; Udisti, R; Hansson, HC; Henning, T; Petkov, B; Strom, J; Krejci, R; Tunved, P; Viola, AP; Vitale, V
2016 | Rend. Lincei.-Sci. Fis. Nat. | 27 (59-71)

Planetary boundaries: Guiding human development on a changing planet.

Steffen, W.; Richardson, K.; Rockström, J.; Cornell, S.E.; Fetzer, I.; Bennett, E.M.; Biggs, R.; Carpenter, S.R.; de Vries, W.; de Wit, C.A.; Folke, C.; Gerten, D.; Heinke, J.; Mace, G.M.; Persson, L.M.; Ramanathan, V.; Reyers, B.; Sörlin, S.
2015 | Science | 347 (736-736)

Size-resolved cloud condensation nuclei concentration measurements in the Arctic: two case studies from the summer of 2008

Zábori, J.; Rastak, N.; Yoon, Y. J.; Riipinen, I.; and Ström, J.
2015 | Atmos. Chem. Phys. | 15

Organosulfates and organic acids in Arctic aerosols: Speciation, annual variation and concentration levels

Hansen, A.M.K.; Kristensen, K.; Nguyen, Q.T.; Zare, A.; Cozzi, F.; Nojgaard, J.K.; Skov, H.; Brandt, J.; Christensen, J.H.; Ström, J.; Tunved, P.; Krejci, R.; Glasius M.
2014 | Atmos. Chem. Phys. | 14 (15) (7807-7823)

A feasibility study of mapping light-absorbing carbon using a taxi fleet as a mobile platform.

Krecl, P.; Johansson, C.; Ström, J.; Lövenheim, B.; Gallet, J.
2014 | TELLUS B | 66

All publications

Atmospheric Science

The life cycle and impact of tiny atmospheric particles known as aerosols – both indoors as well as outdoors.