Global Climate Change: Why and What Happens in the Future?
Prof. Erland Källén
Dept. of Meteorology, Stockholm University
Monday, 6 October 2008, 13:15
Lecture room F
The global climate is warming. The most likely cause behind the warming in
the latter half of the twentieth century is the emission of greenhouse
gases from human activity. If the emissions continue to increase at the
present rate we can expect a warming in this century well beyond what we
have experienced so far. A continued global warming may seriously threaten
human societies as well as the global economy.
The modelling tools used to investigate climate change are based on
physical laws, classical mechanics and thermodynamics as well as modern
quantum physics form the fundamental prerequisites on which climate models
are built. In addition, we need observations of the physical climate
system using advanced techniques such as satellite based remote sensing
and in-situ observing platforms such as aircrafts and balloons.
Observations and theory are combined using mathematical models and
supercomputers. The global climate is described as a dynamical system that
we can use both to understand the past and to make predictions of the