(7) Increasing carbon dioxide will cause sea ice to reduce in spatial coverage. In turn, the reduced sea ice extent is a (a) Positive feedback on surface temperature because it has a greater albedo than ocean (b) Positive feedback on surface temperature because it has a lower albedo than ocean (c) Positive feedback on surface temperature because sea ice has lower heat capacity than ocean (d) Both B and C are true (8) Air over the oceans is colder in summer and warmer in winter compared with air over the continental regions This is because (a) Water is translucent and has a relatively high heat capacity compared to dirt (b) Compared to dirt,a thicker layer of water participates in the seasonal cycle (c) The albedo of water is greater than that of land and thus reflects more solar radiation (d) Both A and B are true

Question

(7) Increasing carbon dioxide will cause sea ice to reduce in spatial coverage. In turn, the reduced sea ice extent is a (a) Positive feedback on surface temperature because it has a greater albedo than ocean (b) Positive feedback on surface temperature because it has a lower albedo than ocean (c) Positive feedback on surface temperature because sea ice has lower heat capacity than ocean (d) Both B and C are true (8) Air over the oceans is colder in summer and warmer in winter compared with air over the continental regions This is because (a) Water is translucent and has a relatively high heat capacity compared to dirt (b) Compared to dirt,a thicker layer of water participates in the seasonal cycle (c) The albedo of water is greater than that of land and thus reflects more solar radiation (d) Both A and B are true

Answer 1

(7) (b) Positive feedback on surface temperature because it has a lower albedo than oceanExplanation: Sea ice has a lower albedo (reflectivity) compared to the ocean, meaning it absorbs more solar radiation and contributes to further warming of the surface temperature. This creates a positive feedback loop, where the reduction in sea ice extent leads to further warming and further reduction in sea ice.(8) (d) Both A and B are trueExplanation: Air over the oceans is colder in summer and warmer in winter compared to air over continental regions because water has a higher heat capacity compared to dirt, meaning it takes longer to heat up and cool down. Additionally, a thicker layer of water participates in the seasonal cycle, leading to a more moderate temperature range compared to land.

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