Klaus Hasselmann
Klaus Hasselmann is a leading German oceanographer and climate modeller. He is probably best known for developing the Hasselmann model of climate variability, where a system with a long memory integrates stochastic forcing, thereby transforming a white-noise signal into a red-noise one, thus explaining the ubiquitous red-noise signals seen in the climate. He was awarded the 2021 Nobel Prize in Physics jointly with Syukuro Manabe and Giorgio Parisi for groundbreaking contributions to the "physical modeling of earth's climate, quantifying variability and reliably predicting global warming" and "understanding of complex systems".