从气温、降水、风速三方面分析南极的气候特征

2025-02-11 22:23:41
推荐回答(1个)
回答1:

南极气候有酷寒、干燥、烈风三大特点,具体表现在:
1.终年酷寒。大部分地区年平均气温在-25°C以下,极端气温达-88°C以下;原因是纬度高获得太阳辐射少;冰雪覆盖,反射强烈;海拔高气温更低;周围海洋的西风带阻隔了低纬热量向高纬的传递。
2.气候干燥。大部分地区年平均降水量为55mm以下,降水量最少的地方不足5mm; 原因是极地高压控制,降水少,但蒸发量更少,为湿润地区。但由于降水以固体形式为主,升华少,空气中水汽含量很少,所以非常干燥。
3.风力强劲。大部分地区的年平均风速17米/秒~18米 /秒,最大风速可达100米/秒。原因是冷气流从高原内部向四周扩散(极地东风),冰雪表面摩擦力小形成狂风。
解释够详细了吧!

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