继低纬度的北京罕见出现绝美极光后,今日(5月14日)北京天空出现火烧云,吸引全城市民在故宫、颐和园、国贸CBD等地标建筑驻足拍摄。有市民在网络发帖讚今日美景是“世纪晚霞”、“史诗级日落”。
据新京报报道,气象专家尹炤寅介绍,阳光斜射薄云,将发生“瑞利散射”现象,波长较短的紫光、蓝光难以踰越障碍,被迫散开;红光、橙光这些波长较长的光,则可以轻鬆跨越障碍,被保留下来,因而也就出现了霞光。
夏季更容易出现美丽的晚霞。由于天气晴热、阳光充足,地面蒸发强,大气中水汽分子含量高,所以阳光射向地面的过程中,蓝紫光受到的阻碍更多,丢失得更多,留下的红光、橙光也就越发纯粹、豔丽。
今日北京晚霞天空有一处明显的分界线,对此,尹炤寅介绍,分界线处是云体后界,后面没有云了,光线自然也无法散射,形成晚霞。至于为何分界如此“光滑”,这是因为今天的冷空气势力强。
据悉,近日受冷空气影响,北京的大风频频来扰,今天更是有8级阵风。尹炤寅表示,今日出现的大风和冬季的系统性北风成因一样。“蒙古国有一大团冷空气,气压很高,中心气压1027.5hPa;华北南部气温高,形成低气压,中心气压1007.5hPa,空气由高压区流向低压区,就形成了风。北京城区到内蒙古中南部不到500公里的距离,气压差却达到了12.5hPa(一般情况下只有5hPa),于是就产生了大风。”尹炤寅说,这样的现象在冬季强冷空气来袭时很常见,但在现在这样临近夏季的时节很少见。
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