温暖的北极温度正在美国造成更频繁的寒风爆炸, Warmer Arctic temperatures are causing more frequent cold blasts in the US, surprising as it may seem.

尽管全球变暖,但美国可能更频繁地遭受寒风的冲击。 Despite global warming, the US may experience more frequent cold blasts. 之所以出现这种情况,是因为北极变暖速度比世界其他地区快四倍,致使喷气流发生转变,使被称为极地涡旋的北极冷空气向南移动。 This occurs because the Arctic, warming four times faster than the rest of the world, is causing the jet stream to shift, allowing cold Arctic air, known as the polar vortex, to move further south. 虽然冬季平均比25年前暖和,但寒冷的爆发越来越普遍。 While winters are on average warmer than 25 years ago, these cold outbreaks are becoming more common.