Johan Ström

Johan Ström is a Professor in the Department of Environmental Science at Stockholm University, specializing in atmospheric science with a focus on aerosols and their impact on climate. His research primarily investigates the life cycle and effects of atmospheric particles known as aerosols, both indoors and outdoors, with particular emphasis on Arctic regions and high-altitude environments like the Himalayas. He maintains his office in Room X 215 at Svante Arrheniusväg 8 C, Geohuset.

Professor Ström's research interests center on atmospheric particles and their climate impacts, particularly focusing on black carbon, light-absorbing particles, and their effects on snow albedo and Arctic climate systems. His work examines how aerosols influence cloud formation through cloud condensation nuclei processes and how changing Arctic conditions affect aerosol properties. He investigates the relationship between marine biogeochemical processes (like dimethyl sulfide emissions) and atmospheric particle formation, as well as the historical deposition of pollutants in Arctic ice cores.

Analysis of Professor Ström's recent publications reveals a strong focus on Arctic atmospheric processes, with particular attention to black carbon and light-absorbing particles in snow and ice. His research spans multiple geographical regions including the European Arctic, Svalbard, and the Himalayas, examining how aerosols affect snow albedo, glacier melt, and cloud formation. His work combines long-term observational data from research stations like the Zeppelin Observatory with advanced analytical techniques to understand aerosol sources, transport mechanisms, and climate impacts.

Professor Ström is actively involved in major research collaborations, including work at the Zeppelin Observatory in Ny-Ålesund, which has been operational for over 30 years as part of international monitoring programs such as the Arctic Monitoring and Assessment Programme (AMAP), Global Atmosphere Watch (GAW), and Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS). His research contributes significantly to understanding Arctic climate change and the role of aerosols in polar amplification.

His laboratory and field work spans multiple continents, with research activities in the European Arctic, Himalayan regions, and Central Sweden. Professor Ström's team utilizes advanced instrumentation for measuring aerosol properties, including particle size distributions, chemical composition, and optical characteristics, contributing to our understanding of how atmospheric particles influence climate processes in sensitive regions.