Discussion Overview
The discussion centers on the heat absorbed by melting ice, specifically around 500 gigatons (GT) per year from various sources, including Antarctica and Greenland. Participants explore the implications of this heat on the biosphere and the overall energy balance of the Earth, touching on concepts of latent heat, albedo effects, and the potential impacts of ice loss.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant requests a refereed paper on the heat absorbed by melting ice, calculating it to be around 1.67 x 1023 joules per year based on latent heat of fusion.
- Another participant corrects the initial calculation, stating that the heat absorbed should be approximately 1.6 x 1020 joules, indicating a factor of 1000 error in the first post.
- A subsequent post acknowledges the correction regarding the heat calculation.
- One participant argues that the loss of the high-albedo north-polar ice cap will lead to significant increases in energy absorption due to prolonged insolation, suggesting that previous estimates of energy input may be underestimated.
- Another participant notes that the implications of the ice cap loss represent a different question from the original inquiry about heat absorption.
- A later reply emphasizes that calculations regarding phase changes and added energy must consider albedo effects, particularly for sea ice, while also humorously questioning the purpose of umbrellas in drinks.
Areas of Agreement / Disagreement
Participants generally disagree on the implications of heat absorption and the significance of the energy balance, with multiple competing views on the impact of ice loss and the accuracy of calculations presented.
Contextual Notes
Some calculations depend on specific assumptions, such as temperature conditions for phase changes and the role of albedo, which may not be fully addressed in the discussion.