1. Over the glacial-interglacial cycles of the past 800,000 years, temperature i

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Question

Over the glacial-interglacial cycles of the past 800,000 years, temperature increases occurred before CO2 changes, suggesting that CO2 was not the main driver of these climate cycles but a climate feedback.

False

When was the last time atmospheric CO2 was at present-day levels of ~400 ppm?

1000 to 8000 years ago

800,000 years to 1 million years ago

2.5 to 5 million years ago

10 to 20 million years ago

When CO2 was last at 400 ppm, why did the climate then differ from our present climate?

The climate of the Pliocene had large ice sheets that lead to a colder climate despite higher atmospheric CO2

The climate of the Pliocene had no oceans to absorb heat and was therefore much warmer than today

The climate of the Pliocene was still adjusting to the atmospheric greenhouse gas forcing, while our climate is in equilibrium with the increased atmospheric greenhouse gas concentrations

The climate at the Pliocene was in equilibrium with the atmospheric greenhouse gas forcing, while our climate is still adjusting to the increased atmospheric greenhouse gas concentrations

In order to explain the large global temperature oscillations during glacial-interglacial cycles that are seen in the proxy climate record, what kind of feedbacks are required to amplify the small solar forcing from the orbital Milankovitch cycles?

Negative feedbacks

Positive feedbacks

Milankovitch feedbacks

Neutral feedbacks

Which of the following is probably NOT a likely explanation for producing conditions that would result in an ice age on Earth?

Reduced solar illumination in the northern hemisphere summer

Increased organic carbon burial

Reduced methane from reaction with oxygen

Massive biomass burning

Increased weathering of rocks

A True B

False

Explanation / Answer

1.False

2. 2.5-5 million years ago

3.The climate at the Pliocene was in equilibrium with the atmospheric greenhouse gas forcing, while our climate is still adjusting to the increased atmospheric greenhouse gas concentrations

4.Positive feedbacks

5.Massive biomass burning

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1. Over the glacial-interglacial cycles of the past 800,000 years, temperature i

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1. Over the glacial-interglacial cycles of the past 800,000 years, temperature i

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