CICERO - Center for International Climate Research
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Methane: a climate blind spot?

Methane is one of the greenhouse gases that contribute most to global warming. Recent research show that its levels are increasing, and the researchers don’t know why.

Der rare sommerværet

Dr. Nikolaos Evangeliou on climate change and wildfires (Oslo, August 2018). Evangeliou works at NILU – Norwegian Institute for Air Research 

Sensible heat has significantly affected the global hydrological cycle over the historical period

Multiple lines of evidence indicate widespread changes to the global water cycle since 1950. Here we show, using a range of climate modelling results, that changes in sensible heat are the dominant contributor to the present global-mean precipitation change since preindustrial time.

How cleaner air changes the climate

Aerosols have a strong influence on the present climate, but this influence will likely be reduced over the coming decades as air pollution measures are implemented around the world, writes Bjørn Hallvard Samset in a commentary in Science.  

Global warming increases rainfall most over oceans

Global warming leads to more rain – but little of the change occurs over land. An international team of researchers, led by Bjørn H. Samset at the Norwegian CICERO Center for Climate Research, used ten global climate models to study how precipitation changes when just one factor in the climate system was allowed to change at a time.

Halfway to doubling of CO2 radiative forcing

The doubling of atmospheric CO2 concentrations has become a standard experiment in climate science, and a convenient way of comparing the sensitivity of different climate models.