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ESA Director General, Josef Aschbacher, said, “We send our most sincere congratulations to Prof. Dr Hasselmann for his well-deserved Nobel prize. Klaus joined one of ESA’s external expert groups of scientists in the 1970s, and in 1981 became a member of our High-Level Earth Observation Advisory Committee. He provided outstanding scientific support and recommendations to ESA, in particular on the development of the ERS-1 and ERS-2 missions.”

ESA’s first Earth observation mission dedicated to understanding our planet, the European Remote Sensing satellite (ERS-1), was launched on 17 July 1991 – just over 30 years ago. At the time, ERS-1 was one of the most sophisticated satellites ever developed and launched by Europe, paving the way to a new era in satellite technology to study the atmosphere, land, oceans and ice.

The satellite carried a comprehensive payload including an imaging synthetic aperture radar, a radar altimeter and other powerful instruments to measure many aspects of our planet. ERS-1 was then joined by ERS-2 in 1995 which carried an additional sensor for atmospheric ozone research – the Global Ozone Monitoring Experiment.

Both satellites exceeded their design life by far, delivering a 20-year stream of continuous data that formed the basis for countless research papers on how our planet works and how it is changing.

These pioneering missions have provided the basis for the routine remote sensing we have come to rely upon today to unravel the complexities of the way Earth works. The success of the ERS missions has helped Europe to gain clear leadership in several critical technologies and in the scientific use of Earth observation.

Prof. Hasselmann developed the theory underlying synthetic aperture imaging of ocean waves.

By 1978, the European community had been inspired by Seasat. A series of experiments to understand ocean waves followed, and the preparations for ERS-1 resulted in a series of key reports and results. The synthetic aperture imaging theory led to 2D wave spectra from the Active Microwave Instrument on ERS-1, and the use of these wave spectra products in the ocean models.

Safer seas with Sentinel-1
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This legacy extends to the wave mode products from the Copernicus Sentinel-1 radar mission and the use of these products in operational ocean monitoring.

Dr Aschbacher continued, “Without doubt, it is largely thanks to Prof. Hasselmann that we have operational wave monitoring, or ‘wave mode’ from Sentinel-1 today – a source of essential data for ocean forecasting, keeping maritime traffic safe.”

Prof. Hasselmann is the founding Director of the Max Planck Institute for Meteorology. He receives the Nobel Prize in Physics 2021 together with Syukuro Manabe from the USA and Giorgio Parisi from Italy.