Abstract
Reliable estimatesof future climate change in the Alps are relevant for large parts of the European society. At the
sametime,thecomplexAlpineregionposesconsiderablechallengestoclimatemodels,whichtranslatetouncer-
tainties in the climate projections. Against this background, the present study reviews the state-of-knowledge
about 21st century climate change in the Alps based on existing literature and additional analyses. In particular,
it explicitly considers the reliability and uncertainty of climate projections.
Results show that besidesAlpine temperatures, alsoprecipitation, globalradiation,relative humidity,and closely
related impacts like
fl
oods, droughts, snow cover, and natural hazards will be affected by global warming.
Under the A1B emission scenario, about 0.25 °C warming per decade until the mid of the 21st century and accel-
erated 0.36 °C warming per decade in the second half of the century is expected. Warming will probably be
associated with changes in the seasonality of precipitation, global radiation, and relative humidity, and more
intense precipitation extremes and
fl
ooding potential in the colder part of the year. The conditions of currently
record breaking warm or hot winter or summer seasons, respectively, may become normal at the end of the
21st century, and there is indication for droughts to become more severe in the future. Snow cover is expected
to drastically decrease below 1500
–
2000 m and natural hazards related to glacier and permafrost retreat are
expected to become more frequent.
Such changes in climatic parameters and related quantities will have considerable impact on ecosystems and
society and will challenge their adaptive capabilities
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