Given particular conditions, it is expected that the sea ice in the North Pole region will completely melt in the summer. Extreme weather events in Europe will increase in frequency and strength.

According to the calculations of scientists at the Max Planck Institute for Meteorology in Hamburg, over the next century the climate will change more quickly than it ever has in the recent history of the earth. These results come from the latest climate model calculations from the German High Performance Computing Centre for Climate and Earth System Research.

The global temperature could rise by up to four degrees by the end of the century. Because of this warming, the sea level could rise on average by as many as 30 centimeters. The scientists expect that under certain conditions, the sea ice in the arctic will completely melt.

In Europe, summers will be drier and warmer, and this will affect agriculture. The winters will become warmer and wetter. Another consequence of the heated atmosphere will be extreme events like heavy precipitation with floods.

"The significant result of these future scenarios is the progressive raising of mean global temperatures and the movement of climate zones in connection with that," says Dr. Erich Roeckner, the project leader of the model calculations in Hamburg. "Almost everywhere on earth, the forestry industry will have to husband different types of trees than it has until now."

In addition to the findings about the complex interplay between atmosphere and ocean, the current climate models from the Max Planck Institute for Meteorology also include new findings about the effects of aerosols and the influence of the earth's carbon cycle. The results confirm speculations over recent years that humans are having a large and unprecedented influence on the climate and are fuelling global warming.

To verify their own climate model calculations, the researchers first simulated the climate of the last century and compared the results with the real climate. "In this way, the theoretical models could be adapted very well to reality," says Professor Jochem Marotzke, the Managing Director of the Max Planck Institute for Meteorology.

The results by the climate researchers from Hamburg will be presented in the report from the IPCC, the Intergovernmental Panel on Climate Change. It is developed every five years, on the commission of the WMO, World Meteorological Organisation, and the UNEP, United Nations Environmental Programme.

The IPCC report is provided to governments as an independent source of information. In total, 1000 scientists worldwide are working on the fourth edition of the progress report, due for release in 2007. The scientists are commissioned by their governments to participate in the comprehensive, independent climate status report.

"The Max Planck Institute for Meteorology is participating in the calculation of the IPCC scenarios with a coupled atmosphere-ocean model that is considered one of the best climate models worldwide," says Dr Guy Brasseur, the Director of the Max Planck Institute for Meteorology, and one of the 15 coordinating main authors of the IPCC Report.

"As scientists, we want to provide politicians with a decision paper that is as understandable as possible, and from which they can decide which measures ought to be politically implemented as urgently as possible."

In the framework of the international workshop "Future Climate Scenarios and their Use for Impact Studies", scientists from the Max Planck Institute for Meteorology presented, on September 29th and 30th, their latest model calculations, and discussed them with colleagues and operators from Germany and abroad.

The data and results will be made available, in particular, to research groups that deal with the effects of climate. Those include regional results and the effects on land and sea ecosystems, hydrology, air quality, and socio-economic systems.

The Max Planck Institute for Meteorology in Hamburg is one of the leading worldwide climate research facilities. In the last two years it has contributed 50 scientists to the research project, and made a financial outlay of almost 10 million euros.

Related Links
Max Planck Institute for Meteorology
German High Performance Computing Centre for Climate and Earth System Research
More information on the model calculations
Simulations of Climate Change for IPCC AR4
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