He is studying precipitation and the role of atmospheric aerosols in a changing climate, mainly through climate modelling. Bjørn is a regular newspaper columnist and science commentator. He has previously worked on particle physics, with the ATLAS collaboration at CERN and the BRAHMS collaboration at RHIC. Bjørn has a PhD in Nuclear Physics from the University of Oslo (2006).

Publications

Showing 5 of 703

Understanding the Spread in Climate Feedbacks and Polar Amplification Using Coordinated Multimodel Experiments and CMIP6

Olivia Linke, Julien Lenhardt, Marianne Tronstad Lund et al.

Journal of Climate , 2026

Academic article

Klimastatus 2026

Robbie Andrew, Ragnhild Bieltvedt Skeie, Bjørn Hallvard Samset et al.

2026

Lecture

Multi-Model Impacts of Dust on African Air Quality and Mortality Under Regional and Global Anthropogenic Aerosol Changes

Joe Adabouk Amooli, Ron L. Miller, Kostas Tsigaridis et al.

Journal of Geophysical Research (JGR): Atmospheres , 2026

Academic article

Assessment of Canadian Wildfire Smoke Plume Heights Using EarthCARE Observations and GFAS-driven FLEXPART Simulations

Kerstin Stebel, Sabine Eckhardt, Bjørn Hallvard Samset et al.

2026

Masters thesis

Aerosol-Cloud Interactions: Overcoming a Barrier to Projecting Near-Term Climate Evolution and Risk

Ulas Im, Bjørn Hallvard Samset, Athanasios Nenes et al.

AGU Advances , 2026

Academic article

Show all

Articles

Better knowledge of black carbon and climate change can save lives

Published 16.12.2025

A CICERO-led research project is expected to improve climate mitigation and adaptation in Sub-Saharan Africa and Asia. The key is to understand the role of black carbon in extreme precipitation changes.

Air pollution cuts in East Asia likely accelerated global warming

Published 14.7.2025

Global warming has accelerated since 2010. A new CICERO-led study shows that unmasking of greenhouse-gas-driven warming due to a substantial cleanup in air pollution over East Asia can explain it.

Air pollution | Temperature changes

Extreme weather to strengthen rapidly over next two decades

Published 11.9.2024

70 percent of the global population can expect strong and rapid changes in extreme temperatures and rainfall in the next 20 years unless greenhouse gas emissions are cut dramatically, according to a new study.

2023 record heat came from global warming and weather variations

Published 30.8.2024

Natural variations in the oceans in combination with rapid global warming due to greenhouse gas emissions were behind Earth’s record heat in 2023, according to a new study.

Risk of more fire weather in the North

Published 8.9.2023

There is an increasing risk of large wildfires in high latitude regions, Scandinavia included, concludes a newly published study by researchers from CICERO Center for International Climate Research and the University of Oslo.

Extreme weather | Arctic | Forests

Take climate-changing aerosols seriously

Published 22.11.2022

The dangerous impacts of aerosol changes on vulnerable regions should have been a priority at COP27 after climate policymakers agreed a breakthrough deal to support these parts of the world, scientists have claimed.

Atmospheric particles | Climate risk | Temperature changes | Extreme weather

CICERO researchers contributing to the IPCC’s Sixth Assessment Report

Published 31.3.2022

Researchers from CICERO are contributing to the world's most prominent assessment of climate knowledge in areas such as regional impact, investment and finance, political science, climate scenarios and atmospheric sciences.

IPCC Sixth Assessment Report

Tank ship on a steady course towards the horizon.

Global warming on a steady course

Published 30.3.2022

In a recent study published in Nature Communications, international scientists have taken on a persistent problem in climate science: near-term climate evolution.

Climate impacts internationally | Temperature changes | Climate Models

Projects

Extreme extremes in Norway

What are the worst possible extreme events a given region in Norway is likely to experience, in current or in future climate? In this project we take a deep dive into the governing meteorological conditions behind extreme extreme (XX) events and investigate the consequences of such events at a local level in Norway.

CRiceS - how sea ice and snow affect our climate future

The EU project CRiceS will map the role of polar sea ice and snow in the global climate system.

Arctic | Climate Models

AVIATE: How can aviation contribute to a low-carbon society?

The AVIATE (Aviation in a low-carbon society) project will provide better understanding of the climate impact of aviation, both for Norway and globally, and explore options for reducing that impact.

BorealBlaze

Forest fires have become more intense, more frequent and more extensive in several areas, with global warming as one contributing factor. A new research project, led by CICERO, will examine how forest fires near the Arctic will develop and affect the future climate. The aim is to contribute to improved projections of climate change and risk, for the high latitudes and globally, which is crucial for decision-makers who aim to secure the basis of life for people and nature.

Research groups

Climate System

The Climate System group conducts research to understand the physical changes and evolution of the global and regional climate system, the underlying driving human-induced and natural processes, and the subsequent consequences.