How 1970s film reels are predicting the future of our oceans
In short: To understand how Antarctica will melt in the coming decades, scientists are looking backward. By digitizing nearly 1,000 rolls of vintage radar film from the 1960s and 70s, researchers are creating a high-resolution baseline to test if our current climate models can actually predict the future.
The challenge of predicting sea level rise lies in the vast uncertainty of how Antarctic ice sheets will behave as the planet warms. While modern sensors provide real-time data, they lack a long-term historical context. To bridge this gap, geophysicist Dustin Schroeder spearheaded a project to recover data from a rare trove of historical airborne radar measurements. Half a century ago, a group of Danish, British, and American geoscientists gathered these files via a modified C-130 long-range military plane from the USA.
Stanford University and Cambridge University's Scott Polar Research Institute are working together on this initiative. Because the data is stored on 35mm and 8mm film, Schroeder invested a significant portion of his research budget into a state-of-the-art digital film scanner. By applying modern film scanning technology and machine learning to these archives, the team can analyze the form and flow of the ice sheets as they existed forty years ago.
This historical data serves as a critical 'ground truth' for the Intergovernmental Panel on Climate Change (IPCC). By comparing these old records to modern observations, scientists can see how well current models simulate past changes. If a model can accurately replicate what happened in the 1970s, researchers gain significantly more confidence in that model's projections for the next 20, 30, or 50 years. It is a literal bridge between the 'terra incognita' of the past and the climate uncertainties of the future.
The technology used to peer beneath the ice has evolved from World War II-era film to today's miniaturized sensors. However, the underlying principle remains the same: ice-penetrating radar is the primary tool for observing the continent's interior. By combining these two eras of technology, scientists can better understand the melting ice that threatens global coastlines.
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Sources
- Summary by Intellect · source: How we look kilometers below the Antarctic ice sheet | Dustin Schroeder
- Also: Vintage film provides Stanford scientists new insights about Antarctica - Stanford Doerr School of Sustainability
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