Ryan North is a PhD student at the University of Wollongong studying landscape evolution and climate impacts in Antarctica.
Jam packed issues filled with the latest cutting-edge research, technology and theories delivered in an entertaining and visually stunning way, aiming to educate and inspire readers of all ages, we used nearly 1,000 film photographs of Antarctica from the 1960s to reconstruct exactly what five glaciers were like decades before the Larsen B Ice Shelf collapse. This allowed us to precisely calculate their contribution to sea-level rise.
However, an archive of more than 300,000 historical images contains an invaluable record of this area from 1968 and helped us measure the difference between then and now.Ice shelves are thick floating bodies of ice attached to the coastline of Antarctica. The melting of an ice shelf does not directly cause sea-level rise.
Between 1946 and 2000, United States Navy cartographers flew over almost every corner of Antarctica recording 330,000 high-quality, large-format film photographs in an effort to map the continent.We created accurate and real-world scaled 3D models of five glaciers in the Larsen B area using a technique called photogrammetry. Traditional photogrammetry uses two overlapping photos from different angles to create a 3D surface – like how our two eyes can visualise objects in three dimensions.
Identifiable features in the images with known coordinates, like nearby mountain peaks or uniquely shaped boulders, can then be assigned aAfter the collapse, the glaciers lost 35 billion tons of land-based ice. From one large glacier, 28 billion tons was lost: equivalent to around 0.1 mm of global sea-level rise.
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