Overview of Bedmap3
- Bedmap3 is the most comprehensive dataset of Antarctica’s subglacial landscape, extending the previous Bedmap2.
- It incorporates 84 new aero-geophysical surveys from 15 data sources, adding 52 million more data points and 1.9 million line-km of measurements.
- Significant improvements in understanding major mountain ranges, deep interiors of East Antarctica, West Antarctic coastlines, and the Antarctic Peninsula.
Key Discoveries
Thickest Ice in Antarctica
- The thickest ice (4.7 km) is in Wilkes Land (76.052° S, 118.378° E), not Astrolabe Basin as previously thought.
- This thickness is more than half the height of Mount Everest.
- Average Antarctic ice thickness, including ice shelves, is 1.9 km.
Greater Ice Sheet Volume & Vulnerability
- Antarctica has more ice grounded below sea level than previously realized.
- This makes it more susceptible to melting from warm ocean water intrusion.
- Peter Fretwell (British Antarctic Survey) notes that Antarctica is more vulnerable than previously thought.
Climate Change & Sea-Level Rise Implications
- The Antarctic ice sheet significantly impacts global sea levels.
- Bedmap3 helps scientists predict sea-level rise by modeling ice sheet behavior under global warming.
- The study in Scientific Data (March 10) states that the Antarctic ice sheet’s response to climate change is the greatest source of uncertainty in future sea-level rise.
Future Research & Applications
- Better modeling of past and future ice sheet changes.
- Improved understanding of ice-bedrock interactions.
- Supports climate scientists in predicting the impact of global warming on polar ice.
Bedmap3 provides a more detailed and accurate view of Antarctica’s subglacial landscape, revealing increased ice vulnerability and enhancing our understanding of climate change effects on sea-level rise.
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