A Complete Collection of 100000 Whys
Fav十万个为什么
为什么冬天会降临？
1、地球的自转轴倾斜导致太阳直射点的位置变化，使得冬季时北半球（或南半球）远离太阳，接收到的太阳辐射减少。
2、冬季时，地球的轨道运动使其在近日点附近，但这个因素对季节变化的影响较小，主要还是由自转轴倾斜引起。
3、太阳直射点的南移导致北半球的日照时间缩短，白天变短，夜晚变长，从而使得气温下降。
4、冬季时，大气环流模式发生变化，冷空气从极地地区南下，暖空气被阻挡，导致气温进一步降低。
5、冬季时，海洋和陆地的热容量差异导致陆地降温更快，进一步加剧了冬季的寒冷。
总之，冬天降临是由于地球自转轴的倾斜导致太阳直射点位置变化，使得北半球（或南半球）接收到的太阳辐射减少，同时大气环流和地表热容量差异也加剧了气温下降。
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