Three Physicists Share the Nobel Prize for Contributions Toward Understanding Climate Change

by | Oct 6, 2021 | Fact Heroes, Environment

Syukuro Manabe of Princeton University, Klaus Hasselmann from Max Planck Institute for Meteorology, Hamburg, Germany, and Giorgio Parisi from Sapienza University of Rome, Italy

Three Physicists Share the Nobel Prize for Contributions Toward Understanding Climate Change

by | Oct 6, 2021 | Fact Heroes, Environment

Syukuro Manabe of Princeton University, Klaus Hasselmann from Max Planck Institute for Meteorology, Hamburg, Germany, and Giorgio Parisi from Sapienza University of Rome, Italy
Syukuro Manabe, Klaus Hasselmann and Giorgio Parisi have been announced as winners of the 2021 Nobel Prize for Physics. The prize is awarded “for groundbreaking contributions to our understanding of complex physical systems.”

Syukuro Manabe, Klaus Hasselmann and Giorgio Parisi have been announced as winners of the 2021 Nobel Prize for Physics. The prize is awarded “for groundbreaking contributions to our understanding of complex physical systems.”

The prize is worth 10 million Swedish krona ($1.1 million). Manabe and Hasselmann will share one half of the prize and Parisi takes the other half. Because of the COVID-19 pandemic, there will not be an award ceremony in Stockholm in 2021 and laureates will be presented with their Nobel medals in their home countries.

Parisi was awarded his half of the prize “for the discovery of the interplay of disorder and fluctuations in physical systems from atomic to planetary scales.”

Manabe and Hasselmann share their half of the prize equally “for the physical modelling of Earth’s climate, quantifying variability and reliably predicting global warming.”

From the Nobel Release:

Complex systems are characterised by randomness and disorder and are difficult to understand. This year’s Prize recognises new methods for describing them and predicting their long-term behaviour.

One complex system of vital importance to humankind is Earth’s climate. Syukuro Manabe demonstrated how increased levels of carbon dioxide in the atmosphere lead to increased temperatures at the surface of the Earth. In the 1960s, he led the development of physical models of the Earth’s climate and was the first person to explore the interaction between radiation balance and the vertical transport of air masses. His work laid the foundation for the development of current climate models.

About ten years later, Klaus Hasselmann created a model that links together weather and climate, thus answering the question of why climate models can be reliable despite weather being changeable and chaotic. He also developed methods for identifying specific signals, fingerprints, that both natural phenomena and human activities imprint in the climate. His methods have been used to prove that the increased temperature in the atmosphere is due to human emissions of carbon dioxide.

Around 1980, Giorgio Parisi discovered hidden patterns in disordered complex materials. His discoveries are among the most important contributions to the theory of complex systems. They make it possible to understand and describe many different and apparently entirely random materials and phenomena, not only in physics but also in other, very different areas, such as mathematics, biology, neuroscience and machine learning.

“The discoveries being recognised this year demonstrate that our knowledge about the climate rests on a solid scientific foundation, based on a rigorous analysis of observations. This year’s Laureates have all contributed to us gaining deeper insight into the properties and evolution of complex physical systems,” says Thors Hans Hansson, chair of the Nobel Committee for Physics.

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