昼夜温度波动与预期相反的辐射模式(晚上白天变暖、冷却)通常是由于空气来自其他地方。天气(大规模)方面可以带来如此快速的变化,但往往更倾向于大幅(而不是渐进的)和一个方向(如前面通过)。然而偶尔会有有趣的振荡附近更多的固定方面,诸如此类的事件从俄克拉何马在2018年2月:[![在这里输入图像描述][1]][1]更频繁,更小的夜间和更多的中尺度波动(本地)特性。酷不同区域不同,造成的压力差产生的密度差异移动周围的空气……两个常见的原因这样的变化可以发行量在海洋或其他大型水体(你可能不相关!)和terrain-induced发行量(可能更切中要害的!)。晚上的可能是最有效的下行风,造成比周围的空气快速冷却在山上,和downvalley风,造成足够的空气从下坡的建立。这节课从(Stephan De Wekker)[2]给出了一些更多的细节在其中的一些特性和其他地形流动。通常轻微大规模风向的变化和不同的温度在不同程度的山脉和山谷可以导致相当复杂的设定的温度的上升和下降。也不是不可能,有一些问题与你的站,我最初关心的几件事情:——尤其是风似乎奇怪——由于北整个时间总是可疑的,不到1英里一整个晚上和清晨,虽然不是不可能,使它更可疑是否显著的温度平流可能发生。多也很少看到温度和露点变化几乎100%长时间步的变化——水分改变慢得多,除了在尖锐的领域(和在夜晚时温度会推动降低空气饱和(T = T_d美元))。 But a look at observations across the region for the time period: [![enter image description here][3]][3] does show perhaps your data isn't impossible. The meteograms from Libby [KS59] and Missoula [KMSO] below do show very weak/calm winds and fairly similar temperature/dewpoints movement. [![enter image description here][4]][4] Still, there's no north winds (except when calm, which is a placeholder when there is no wind), and a slight bit more fluctuation between temperature and dewpoint, so it wouldn't hurt to check whether the station is properly observing. I believe typically flows down a local mountain tend to be cooling at night, as the densest air (coldest) collects along the river. Other features driven by forced air movement can bring warm air to valleys, like [foehns][5] and large-scale downsloping, but those tend to bring drier air in. So assuming it's a valid feature, it appears to be something complex. It can take years of observations to really understand the flows around complex topographic areas. But I would posit a guess that maybe a slight wind shift gradually pushed the pooled dense valley air away from you far enough to get you into slightly warmer air away from the river valley bottom. Or maybe winds become enough to mix down warmer air above. Differences in snowcover/[melting effects][6] or clouds/precipitation might also play a part in what you experienced. But in that part of the world, I'd expect you'll see many more peculiar local temperature fluctuations over your time observing! [1]: https://i.stack.imgur.com/sC0e4.png [2]: https://climate.evsc.virginia.edu/EVSC1300/PowerPoint/EVSC1300_guest_lecture_2017.pdf [3]: https://i.stack.imgur.com/tWI86.gif [4]: https://i.stack.imgur.com/MvSqR.png [5]: https://en.wikipedia.org/wiki/Foehn_wind [6]: https://boston.cbslocal.com/2015/03/25/ask-eric-why-does-humid-air-melt-snow-faster/