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秋之节气“白露”:天气转凉,昼夜温差可达10℃以上

2017-09-07 16:11:58   

 

白露秋风夜,一夜凉一夜。” 今天迎来了全年昼夜温差最大的一个节气——白露。

白露是一年之中第15个节气。此时,天气转凉,温度降低,在清晨或夜晚,近地面空气里的水汽遇冷,会在花草或石头等物体上凝结成白色的露珠,所以人们把这个节气称为“白露”。

【气候特征】

从这个时候起,人们会明显感到炎热的夏天已过。白露过后,冷空气逐渐南下,天气转凉,昼夜温差可达10摄氏度以上,也是全年昼夜温差最大的一个节气。

为什么温差最大?此时副热带高压退居至西太平洋,加上大陆高压阻挡,南方的水汽很难向北输送,导致天空中的云量减少——少了云层的保温作用,夜间气温就会明显下降。同时,白天的阳光到达地面的“阻力”也有所减少。

“白露秋风夜,一夜凉一夜。”北风起、露渐白、夜更长,如果再来一场秋雨,更是催促人们该添衣了。

【相关诗词】

《蒹葭·诗经》

蒹葭苍苍,白露为霜。所谓伊人,在水一方。溯洄从之,道阻且长。溯游从之,宛在水中央。

蒹葭萋萋,白露未晞。所谓伊人,在水之湄。溯洄从之,道阻且跻。溯游从之,宛在水中坻。

蒹葭采采,白露未已。所谓伊人,在水之涘。溯洄从之,道阻且右。溯游从之,宛在水中沚。

《白露为霜》

唐·颜粲

悲秋将岁晚,繁露已成霜。

遍渚芦先白,沾篱菊自黄。

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