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有什么证据连接冰盖融化和构造运动的变化?

阅读我的另一个问题,多少钱格陵兰大陆地壳均衡反弹导致长期气候变化?接下来的问题是,如果有的话,影响均衡反弹后冰帽融化会对板块构造运动。类似的情况可以适用于南极冰盖。

一个重要的考虑因素为这个调查质疑是否有任何证据从地质历史链接均衡反弹从冰盖融化到板块构造运动的变化。所以,问题是,

有什么证据连接冰盖融化和构造运动的变化?

回答

大陆移动慢慢地* *。冰期是比较短暂的。说,显然是一个巨大的板块构造和地球是否在冰室或温室条件。地球上很少有若冰地球在温室(又名温室)条件。恐龙在靠近两极。地球的气候是(现在也是)在冰室地球相当凉爽。广泛的冰川作用只发生在冰室地球。注意,我们目前在冰室地球条件下;我们只是碰巧在冰期之间。下列条件导致冰室地球都是由于板块构造:——有一个大陆停在一极。 For example, Antarctica is currently parked over the South Pole. This is not a sufficient condition, however. Antarctica has been parked over the South Pole for 100 million years or so. The Earth has been in icehouse conditions for the last 30 million or so years, and in ice age conditions for about the last 2.3 million years. - Having significant land masses within 45 degrees of a pole. With the possible exception of snowball Earth (icehouse Earth gone wild), icehouse conditions need significant amounts of land near a pole. Having one continent parked over the pole but most of the continents close to the equator doesn't create icehouse conditions. - Having relatively low seafloor spreading at midoceanic ridges. This is crucial, for two reasons. Lots of seafloor spreading means lots of CO<sub>2</sub> being released into the oceans and eventually into the atmosphere, thereby enhancing the greenhouse effect. Lots of seafloor spreading also means more and higher midoceanic ridges. This raises the sea level, which in turn increases the amount of Earth's surface covered by water, which in turn decreases the Earth's albedo. Reduced seafloor spreading means reduced CO<sub>2</sub> levels, reduced sea level, and increased albedo. - Having oceanic currents keep equatorial regions warm, polar regions cool. The opening of the Drake Passage about 41 million years ago and the opening of the Tasmanian Gateway about 35 million years ago enabled the cold circum-Antarctic current to form. This is when Antarctica turned from just cold to < expletive deleted > cold. The closure of the Panama seaway between 13 and 2.6 million years was the last nail in the coffin regarding current ice age (as opposed to mere icehouse) conditions.

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