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第八百零一章 驯服骆驼(二)(2 / 2)

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“接下来应该是牵卧驯练,但现在天快黑了,我们应该尽快找个地方度过夜晚,或者顺着原路返回,不过在此之前我需要先帮助它站起来。”

骆驼并不是大象,摔倒了就完全站不起来,只不过会费些力气。

可什么都看不见的它根本不敢动弹,摘下头套又会发狂,为此毕方必须帮助其站立,然后牵引骆驼的行动。

毕方重新找了块布,用其替换下背包,接着用工具制作一个小铲子,开始在骆驼的四周挖沙子。

“我们附近都是沙地,想要让骆驼站起来就是一件非常简单的事情了,只要把它身下的沙土都挖空,它自然而然就站起来了。”

一蓬蓬的沙土被扬起,推积在四周,骆驼的倾斜角也一点点的发生改变。

从完全平躺,再带三十度,四十度......

等到毕方拽着缰绳,将其从六十度的斜坡上拉起时,天已经彻底黑下来了。

光是抓到这头骆驼,居然就花了足足一整天的时间。

空气中泛起了一丝凉意。

“撒哈拉沙漠的昼夜温差平均值可以达到42c,也就是白天四十度,晚上可能只有零下二度,现在我已经能感觉到寒意了,我怀疑现在的气温可能只有七八度,并且还在继续下降。”

天才刚黑,气温居然下降的这么快。

很多观众都感到有些不可思议。

真的是“急剧”下降。

“很多人都以为沙漠昼夜温差大的原因是因为沙子比热容低。”

“白天,光和热被顶层的沙粒迅速吸收,然后释放回空气中,使空气过热,温度飙升。到了晚上,沙子中的大部分热量又会迅速散去,从而使周围环境变冷。”

“不过,这种现象其实不足以解释为什么沙漠夜间温度会急剧下降,或者只是其中一个原因,但如果你亲身经历过就知道,这降温真的快到不可思议。”

被蒙住眼睛的骆驼乖乖的顺着牵引行走。

毕方特意将缰绳加长,将距离拉长到三米,防止骆驼突然暴起。

“其实沙漠温度急剧变化的主要原因是沙漠的空气非常干燥,降水量少,且云层稀少,无法吸收太阳的热辐射,所以,沙漠白天的温度很高。例如智利的阿塔卡马沙漠的湿度几乎为零。”

“空气中的水蒸气像一块巨大的、看不见的毯子一样,将热量裹在地面上,并阻止其散发到大气中。”

“高湿度的空气也需要更多的能量来加热,也意味着,热量的消散和周围环境的冷却也需要更多时间。”

“这才是沙漠中温度昼夜变化如此之大的底层原因。”

“而且也正是温度下降速度过快,很多时候人都反应不过来,导致出现身体失温状态,如果不做升温措施,很快就会危及生命,这也是为什么沙漠的寒冷明明没有高纬度地区那么夸张,却依旧致命的原因。”

“如果是正常穿越,这个时候我可能会选择尽快找个地方休息,但是为了防止意外,还有尽早驯服骆驼,今天还是连夜赶路吧。”

星空下,毕方牵引着蒙住双眼的骆驼,朝着沙漠外走去。

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