The Younger Dryas was an abrupt cooling period around 13,000 years ago that was believed to be caused by:

Question

BlackTom AI · Accepted Answer

The question asks about the cause of the Younger Dryas, an abrupt cooling event around 13,000 years ago.
The provided correct answer states: 'a change in the thermohaline circulation of the Atlantic.' This option points to a disruption in the Atlantic Meridional Overturning Circulation (AMOC), which is the large-scale movement of ocean water driven by differences in temperature and salinity. In many scientific reconstructions, substantial freshwater input from melting ice sheets would have reduced the salinity and density of surface waters, inhibiting the formation of deep water and weakening or shutting down the AMOC. With a slower or altered AMOC, heat transport from equatorial regions to the North Atlantic would diminish, leading to regional cooling and supporting the rapid climate shift seen in the Younger Dryas.

Since no other answer choices are provided in the data, it isn’t possible to contrast this option with alternatives. However, in general, other proposed causes for abrupt climate events around that time include external impacts or volcanic activity, and some theories suggest solar or orbital forcing as contributors. The key idea behind the stated option is the oceanic mechanism: a disturbance to the thermohaline circulation altering heat distribution, which aligns with major interpretations of the Younger Dryas signal.

If you had alternate options listed, we would assess each by whether it plausibly explains the rapid cooling and timing, considering evidence from ice cores, marine sediments, and climatic proxies. The emphasis here remains on the AMOC disruption as a coherent mechanism consistent with abrupt Northern Hemisphere cooling during the Younger Dryas period.

The Younger Dryas was an abrupt cooling period around 13,000 years ago that was believed to be caused by:单项选择题

类似问题

What is the age of the base of the “Hockey Stick” where temperatures start to warm significantly?

The location of the current Sahara Desert and Sahel hosted a giant lake called mega Lake Chad. When did very large lake exist and what does that existence tell you of climate at the time.

Which of the following is or are true?

Which of the following statements related to climate variation is true?

A project has a required return of 12.6 percent, an initial cash outflow of $42,100, and cash inflows of $16,500 in Year 1, $11,700 in Year 2, and $10,400 in Year 4. What is the net present value?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单