CICERO

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.

Rapid Adjustments Cause Weak Surface Temperature Response to Increased Black Carbon Concentrations

Camilla Weum Stjern, Bjørn Hallvard Samset, Gunnar Myhre, Piers M. Forster, Øivind Hodnebrog, Timothy Andrews, Olivier Boucher, Gregory S. Faluvegi, Trond Iversen, Matthew Kasoar, Viatcheslav V. Kharin, Alf Kirkevåg, Jean-Francois Lamarque, Dirk Jan Leo Oliviè, Thomas Benjamin Richardson, Dilshad Shawki, Drew Shindell, Christopher J. Smith, Toshihiko Takemura, Apostolos Voulgarakis

PDRMIP: A precipitation driver and response model intercomparison project-protocol and preliminary results

Gunnar Myhre, Piers M. Forster, Bjørn Hallvard Samset, Øivind Hodnebrog, Jana Sillmann, Siv Gundrosen Aalbergsjø, Timothy Andrews, Olivier Boucher, G. Fulavegi, Dagmar Fläschner, Trond Iversen, Matthew Kasoar, V Kharin, Alf Kirkevåg, Jean-Francois Lamarque, Dirk Jan Leo Oliviè, Thomas Benjamin Richardson, Drew Shindell, Keith P. Shine, Camilla Weum Stjern, Toshihiko Takemura, Apostolos Voulgarakis, Francis W. Zwiers

Declining uncertainty in transient climate response as CO₂ forcing dominates future climate change

Gunnar Myhre, Olivier Boucher, François-Marie Breon, Piers Forster, Drew Shindell

Response of Arctic temperature to changes in emissions of short-lived climate forcers

Maria Sand, Terje K. Berntsen, K. von Salzen, Mark G. Flanner, Joakim Langner, David G. Victor

Quantifying Climate Impacts of Future Forest Management Strategies in Norway

The international community has agreed that the increase in global temperature must be limited to 2°C above the pre-industrial levels. Meeting this ambitious goal requires a large-scale shift away from the fossil economy towards one based on renewable materials and energy like biomass.

SUPER - SUb-daily Precipitation Extremes in highly-populated Regions

The main objective of SUPER is to quantify the influence of anthropogenic activity on sub-daily extreme precipitation in highly populated regions

ICOS-Norge

Integrated Carbon Observation System (ICOS)-Norway and Ocean Thematic Centre (OTC)

Quantifying Impacts of South Asian Aerosols on Regional and Arctic Climate

The main objective of QUISARC is to quantify regional and Arctic climate impacts of South Asian aerosol emissions, by updating present emission inventories and tracing the aerosol impacts through teleconnections, and physical and chemical processes

Bio4Clim

Comparative climate impact assessment of the forest based bio-economies of Norway, Sweden and Finland

HYPRE - HYdropower and PREcipitation trends

Investigating historical and future precipitation trends in regions important for hydropower production

BlackArc (Black carbon and Arctic climate)

How do Black Carbon (BC) aerosols influence Arctic climate change? The outcome of the ‘BlackArc’ project is to reduce the uncertainty in modelling BC and to better constrain the climate impact of BC with an Arctic focus.

NAPEX

Precipitation is arguably the most direct link between the climate and human society. We depend upon existing precipitation patterns for fresh water and food production, and global infrastructure is designed to withstand current precipitation extremes.

The NetBC project

Black carbon: A challenging piece of the climate puzzle

AC/BC

In search of airborne soot, and how it affects the climate

CiXPAG - Interaction of Climate Extremes, Air Pollution and Agro-ecosystems

Future food production, and consequently food security, is very sensitive to both climate change and air pollution. So far, little is known about how climate extremes and ozone pollution interact to affect agriculture or about the relative effectiveness of climate change adaptation and ozone regulation measures for various crops and regions.

ACCRI CIC-MOD

The objective of the ACCRI CIC-MOD project is to investigate how aviation emissions in different regions affect the atmosphere and climate on regional and global scales.

New climate sensitivity estimates higlighted in ESD