为什么当地表温度升高时,结霜深度会增加?-地江南体育网页版球科学堆栈交换江南电子竞技平台 最近30个来自www.hoelymoley.com 2023 - 04 - 11 - t21:44:14z //www.hoelymoley.com/feeds/question/16513 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/16513 14 为什么当地表温度升高时,结霜深度会增加? ShemSeger //www.hoelymoley.com/users/702 2019 - 03 - 19 - t17:34:52z 2022 - 12 - 19 - t15:56:01z 今年我们经历了一个不同寻常的冬天,一股晚来的寒流导致人们的地下水管结冰。现在天气暖和了一些,更多的人的鱼线被冻住了,因为上面正在融化的地面把霜压得更深了。是什么导致了这个现象?为什么霜变暖后不简单地从上到下融化呢?为什么它会继续深入?< / p > //www.hoelymoley.com/questions/16513/-/16515#16515 26 为什么当地表温度变暖时,霜的深度会增加? 卡米洛·Rada //www.hoelymoley.com/users/11908 2019 - 03 - 19 - t17:57:41z 2019 - 03 - 20 - t21:02:58z 这是由于热量缓慢地扩散到地面。与液体不同,土壤不能移动,因此,在没有液态水的情况下,热量只能通过传导传递,这个过程符合扩散方程,而且非常缓慢。这意味着,如果有热浪或寒流,它们的影响会延迟到达土壤深处,越深,延迟越长,波到达时就会受到更大的影响。< / p >

This figure shows a heat wave in the soil

enter image description here

(figure from Soil Temperature at ScienceDirect)

As you can see, the plot shows that there was a peak in temperature of about 27°C at the surface (0m) at time t=6h, but that peak in temperature slowly diffused downwards, such that at a depth of 0.2 m, the peak happened at time t=8h reaching only about 23°C, and at a depth of 0.4 m it arrived even later, at about t=18h and reached only 21°C.

In you case, what is happening that the cold snap is still "traveling" down the ground.

An alternative way to understand this, is that the cold snap cooled the ground so that a layer below the surface can be now at, let's say -5°C, and it is on top of a deeper layer at +1°C, where the water pipe is located. What that deeper layer feels is not what happens in the surface, that is nice and warm, it feels the temperature of the layer right on top of it, that is still very cold. So that deeper layer will cool down and eventually freeze. Freezing as well the water line with it.

That said, and to address some great comments. The current freezing of underground water lines responds to a past forcing. Therefore, it have nothing to do with current weather and is not the thawing ground what pushes the frost down. It is just the normal curse of events in the propagation of a cold/hot wave down into the ground.

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