为什么一边山脉是郁郁葱葱的——地球科学栈交流江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 04 - 05 - t19:08:13z //www.hoelymoley.com/feeds/question/6760 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/6760 15 为什么一边郁郁葱葱的山脉 user153582 //www.hoelymoley.com/users/4674 2015 - 10 - 22 - t00:20:52z 2017 - 03 - 25 - t12:21:11z < p >我的新网站,当然也不会有任何真正的大气科学背景,所以请原谅我如果这个问题有点蠢。< / p > < p >我记得在高中时了解山脉经常被干和郁郁葱葱的另一侧。对此的解释是,当云接近的山郁郁葱葱的一面,所以它可以释放任何下雨上升范围。这似乎总是像一个愚蠢的对我解释,因为在这样的措辞,这似乎意味着认识到云。也,这就意味着云只能(大部分)方法从郁郁葱葱的山边,这可能是也可能不是真的,但是我不知道为什么。我相信有一个更好的解释为什么发生这种情况,但我希望有人可以解释。< / p > < p > < / p >感谢 //www.hoelymoley.com/questions/6760/-/6761 # 6761 24 haresfur为什么一边回答的山脉是郁郁葱葱的 haresfur //www.hoelymoley.com/users/1242 2015 - 10 - 22 - t00:52:32z 2015 - 10 - 22 - t04:59:21z < p >喀斯喀特山脉在美国西北太平洋地区是一个很好的例子来解释这一点。主导风向是来自西方的-在太平洋上空。海洋的空气增加水分蒸发。后通过海岸,山上空气上升的原因。所以它冷却。寒冷的空气可以容纳水蒸气不如温暖的空气,空气变得饱和水和它凝结到云。有足够的缩合得到雨,很多西部的山区。所以你把它向后,雨不允许空气上升,上升使得它下雨。云主要方法从郁郁葱葱的因为这是流行的风向,但最好是说它是郁郁葱葱的一面,因为云主要方法。当风来自另一个方向是在土地旅行所以它包含更少的水和冷却通常不足以引起降雨。< / p > < p >一旦空气穿过山脉的另一边它温暖,成为欠饱和水。 Clouds often disappear and even if they remain you aren't getting further condensation to produce a lot of rain. So those areas are much drier.

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 //www.hoelymoley.com/questions/6760/-/6762 # 6762 9 凯西为什么一边回答的山脉是郁郁葱葱的 凯西 //www.hoelymoley.com/users/64 2015 - 10 - 22 - t02:01:28z 2017 - 03 - 25 - t12:21:11z < p >我会增加其他回答一个例子。考虑一个理论面向南北的山脉,海拔上升2000米,两侧土地的范围是在海平面。山以西的一个小方法是海洋。位置是中纬度和从西方盛行的风。< / p > < p >空气沿表面传播,加快水分。让我们假设一个表面温度28°C和23°C一旦空气的露点达到山西侧的基础。这个包裹现在上升2000米的垂直高度。在500包裹已经冷却到饱和,现在有一个22°C和露点温度22°C。这个高度也将云层形成的高度。500米以上山上将会多云。包裹将继续上升的另一个1500米的山顶,海拔2000米,温度已经冷却到约16.5°C。

As the temperature dropped from 22 °C to 16.5 °C water condensed to contribute to cloud water and rain. In total, for every kg of air flowing up the mountain in this state, 3 g of liquid water is produced via condensation. This windward side of the mountain with the moist upslope flow is going to be lush from frequent and abundant rain showers.

Once the parcel tops the mountain and begins to flow down the lee slope it will begin to warm and relative humidity will drop. Any cloud blown over the mountain top will evaporate as it moves downslope. By the time the parcel reaches the ground at sea level east of the mountain it has a temperature of 36 C and a dewpoint of 19.5 °C - hot and dry. The less slope and the region to the east will be arid. Regions like this are referred to as being in the "rain shadow" of a mountain.

These numbers are ballpark back-of-the-envelope estimates from a Skew-T diagram and while not exact they are representative.
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