**每日一题：挑战你的知识极限** 在我们生活的世界中，充满了未知和奥秘。为了不断拓展我们的知识边界，提升自我认知，我们特设“每日一题”栏目。这个栏目旨在通过提出各种有趣且富有挑战性的问题，激发你的思考，拓宽你的知识视野。 **题目**： 请简述全球变暖对极地冰川的影响及其对海平面变化的作用机制。 **题目解析与答案**： 全球变暖是一个全球性的环境问题，对地球的各个角落都产生了深远的影响。特别是对极地冰川的影响更是显著。 1. **影响**： 全球变暖导致极地冰川融化的现象越来越严重。

* 北极地区：北极地区的冰川正在以惊人的速度融化，尤其是夏季的融化速度更快。

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* 南极地区：南极的冰川也在逐渐融化，尤其是在其边缘地区，由于海水温度上升和海冰减少，冰川融化的速度也在加快。 2. **作用机制**： 极地冰川的融化会导致海平面上升。 * 当冰川融化时，大量淡水流入海洋，导致海洋中的水平面上升。这种上升的效应是逐渐累积的，特别是在冰川大量融化的情况下，其影响更加明显。 * 由于海洋的热膨胀效应（随着温度升高，水的体积会增加），这也加剧了海平面的上升。 因此，全球变暖对极地冰川的显著影响直接导致了海平面的变化。海平面的上升给沿海城市带来了极大的威胁，例如导致海岸线侵蚀、洪涝灾害、生态环境的改变等。因此，全球变暖问题不容忽视，需要我们共同努力来减缓其影响。 **英文翻译**： "Challenge Your Knowledge Limit Every Day" In the world we live in, there are countless unknowns and mysteries. To continuously expand our knowledge boundaries and enhance self-awareness, we have established the "Challenge Your Knowledge Limit Every Day" column. This column aims to stimulate your thinking and broaden your knowledge horizons through the presentation of various interesting and challenging questions. **Question**: Please briefly describe the impact of global warming on polar glaciers and its mechanism on sea level changes. **Question Analysis and Answer**: Global warming is a global environmental issue that has far-reaching effects on every corner of the earth. Especially, its impact on polar glaciers is significant.

1. **Impact**: Global warming is leading to increasing melting of polar glaciers.

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* In the Arctic region, ice sheets are melting at an alarming rate, especially during summer. * In the Antarctic region, glaciers are also melting, especially at their edges, due to rising sea temperatures and decreased sea ice. 2. **Mechanism**: The melting of polar glaciers leads to a rise in sea level. * When glaciers melt, large amounts of freshwater flow into the ocean, causing the level of the ocean to rise. This rising effect accumulates over time, especially in cases of significant glacier melting. * The thermal expansion effect of the ocean (as water volume increases with temperature rise) also contributes to sea level rise. Therefore, the significant impact of global warming on polar glaciers directly leads to changes in sea level. The rise in sea level poses a significant threat to coastal cities, such as coastal erosion, flooding, and changes in the ecological environment. Therefore, the issue of global warming cannot be ignored and requires our collective efforts to mitigate its effects.