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“邪恶邪恶邪恶邪恶”-梳理天下新闻

寒潮≠冷空气?邪恶邪恶邪恶邪恶这些“冷知识”了解一下

来源: 北京青年报
2024-11-29 10:45:45

最佳回答

“邪恶邪恶邪恶邪恶”寒潮≠冷空气?邪恶邪恶邪恶邪恶这些“冷知识”了解一下

  今年邪恶邪恶邪恶邪恶下半年的首场寒潮给全国多地带来邪恶邪恶邪恶邪恶雨雪降温和大风天气,什么是寒潮天气?寒潮是如何形成的?我们又该如何防范寒潮影响?

  寒潮是一种大规模的强冷空气活动过程,其主要特点是剧烈的降温和大风,有时还伴有雨、雪、雨凇和霜冻。但并不是每一次冷空气活动都是寒潮,根据《冷空气等级》国家标准的规定,某地冷空气过境后,气温24小时内下降达8 ℃,或48小时内下降达10 ℃,或72小时内下降达12 ℃,并且日最低气温在4 ℃以下,才可称为一次寒潮天气过程。

  寒潮天气一般发生在秋末到来年初春,最早开始于9月下旬,最晚结束于次年5月,以每年春季的3月和秋季10月、11月活动最为频繁。

  寒潮是怎么来的呢?我们知道,地球上不同纬度接收到的太阳辐射量是不同的。地处高纬的北极和西伯利亚地区获得热量非常少,在冬季,北冰洋地区的气温经常在-20℃以下。大量冷空气在这些区域上空聚集,形成势力强大的冷高压气团,在适合的大气环流形势下就会向南入侵,形成寒潮。

  当寒潮来袭,除了及时添衣保暖,避免冻伤之外,还有几点要特别注意:

  老弱病人,特别是心血管疾病、哮喘病人等对气温变化敏感的人群尽量不要外出。

  外出行走和开车要避免冰雪覆盖的道路,当心路滑。

  易受大风影响的室外物品和临时搭建物要做好加固。

  采用煤炉取暖的家庭要注意保持房间通风。

  (央视新闻客户端)

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