IdeasLab 2014 - Julian Dowdeswell - Melting Ice and Rising Seas

TL;DR

Climate change is rapidly melting sea ice and glaciers, leading to rising sea levels and significant environmental impacts.

Transcript

sea ice is the frozen sea surface it's just a few meters thick but it covers up to 20 million square kilometers of the polar seas during winter that's about double the size of europe on the other hand the glaciers and the ice sheets that cover large land areas of the earth's surface are up to kilometers in thick in thickness glaciers are a few hund... Read More

Key Insights

• 🤢 Sea ice cover in the polar seas is thin but expansive, while glaciers and ice sheets on land can significantly impact global sea levels.
• 🫠 Accelerating global temperatures are leading to the rapid melting of ice, especially in the Arctic, with profound environmental consequences.
• 🌐 The changing icy world poses challenges for Arctic sovereignty, shipping routes, and environmental stability with implications for the global climate.
• 🌇 Rising sea levels resulting from melting ice present challenges for coastal cities, delta regions, and global infrastructure.
• 🤢 Global models predict continued loss of sea ice, possible sea ice-free Arctic summers, and significant sea level rise by the end of the century.

Questions & Answers

Q: How are rising temperatures accelerating the melting of sea ice in the Arctic?

Rising global temperatures, driven by greenhouse gases, are impacting the Arctic by reducing reflective sea ice, leading to a self-reinforcing process of less sea ice causing more warming, ultimately accelerating the melting process.

Q: What are the implications of less sea ice in the Arctic for global circulation patterns?

Reduced sea ice in the Arctic can alter global circulation patterns, such as the Gulf Stream, which could have far-reaching implications on climate patterns worldwide, affecting shipping routes, climate stability, and ecosystems.

Q: How is the melting of glaciers and ice sheets contributing to rising sea levels?

The melting of glaciers and ice sheets worldwide contributes to rising sea levels by adding more water to the oceans. Fast-flowing outlet glaciers and thinning ice sheets, particularly in Greenland and mountain glaciers, are hastening this process.

Q: What are the key controls on global sea level rise?

The main controls on global sea level rise are the melting of glaciers and ice sheets, the thermal expansion of the oceans due to warming, and changes in water storage on the Earth's surface, all of which contribute to rising sea levels.

Summary & Key Takeaways

• Sea ice is thin but covers vast areas of the polar seas, while glaciers and ice sheets are much thicker and can contribute to sea level rise.

• Rising global temperatures are accelerating the melting of ice, especially in the Arctic, leading to less reflective sea ice and significant impacts on the environment.

• The changing icy world poses challenges for dealing with Arctic sovereignty, shipping routes, sea level rise, and environmental consequences.