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More often than not, the wind dies down at night after a blustery day.
通常情況下，大風(fēng)刮了一整天后在夜晚會(huì)逐漸平息下來(lái)。
Where does the wind go? Why are nights generally more calm than days?
大風(fēng)去了哪里呢？為什么夜晚一般比白天平靜呢？
The difference between calm nights and windy days is the sun.
平靜的夜晚與多風(fēng)的白天之間的差異源于太陽(yáng)。
During the day, the sun warms the surface of the Earth, which in turn warms the atmosphere above it.
白天，太陽(yáng)照射導(dǎo)致地表溫度升高，進(jìn)而使大氣溫度隨之上升。
But at sunset, the earth’s surface and the layers of the atmosphere directly above it cool faster than higher layers of the atmosphere.
日落時(shí)，地表溫度與大氣溫度比高層大氣下降得更快。
That creates a stable temperature pattern, with dense, cool air on the ground and less dense, warmer air above.
因此形成一種穩(wěn)定的氣溫模式，地面空氣的密度大，溫度較低；而地面上方的空氣較稀薄，溫度較高。
And that’s a little crazy, because normally the atmosphere gets cooler as you go up!
聽(tīng)起來(lái)有些不可思議，因?yàn)橥ǔＧ闆r下，氣溫是隨著高度的增加而遞減的。
譯文為可可英語(yǔ)翻譯，未經(jīng)授權(quán)請(qǐng)勿轉(zhuǎn)載!
