Which of the following statements are not true regarding the melting of Arctic Sea Ice?

(2 answers are not true)

Question

Which of the following statements are not true regarding the melting of Arctic Sea Ice?

(2 answers are not true)

BlackTom AI · Accepted Answer

Question recap: The prompt asks which statements about Arctic sea ice melting are not true, and it flags that 2 answers are incorrect.
Option 1: 'Sea level will rise 30 cm due to melting of Arctic sea ice.' This is not true because melting sea ice that sits on water does not contribute to sea level rise; only land-based ice (glaciers, ice sheets) raises sea level when it melts and drains into the ocean. Therefore, attributing a 30 cm sea level rise specifically to Arctic sea ice melt is inaccurate.
Option 2: 'Earth albedo (reflectivity) will be reduced causing further increased absorption of solar radiation' This statement is true. As sea ice and snow cover decrease, the surface becomes darker (lower albedo), absorbing more solar radiation and accelerating warming.
Option 3: 'Earth albedo (reflectivity) will be increased causing a reduction in absorption of solar radiation' This is not true. Increased albedo would mean more reflection and less absorption, but in the Arctic context the trend is toward decreased albedo with melting ice, not increased albedo. Thus this claim misstates the directional change in reflectivity.
Option 4: 'Sea level is rising every year due the melting of land-based glaciers.' This statement is true. The ongoing contribution of meltwater from land-based ice is a well-established driver of rising sea levels.
Option 5: 'The Arctic region could be ice-free within 30 years.' This is a forward-looking claim that some models and projections discuss as a possibility under certain warming scenarios; while debated, it is not a definitive falsehood in all scientific contexts. As written, it is not categorically false, so it is not one of the two incorrect statements in this item.

In summary, the two incorrect statements are Option 1 and Option 3 because they incorrectly assert that Arctic sea ice melt directly causes a fixed 30 cm sea level rise, and because they claim that albedo would increase (leading to less absorption), which contradicts the established trend of decreasing albedo with ice melt.

ESS 101 A Examination 2 (Friday December 5th 7:00 - 8:30 PM PST)

Which of the following statements are not true regarding the melting of Arctic Sea Ice? (2 answers are not true)

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