STEM与日常科技·英语30篇（6）

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独立成篇2026-D050为何用边界层热力学解释雾的形成

Fog forms not just from cooling air, but from complex interactions between ground radiation and shallow atmospheric layers.
Article 2026-D050 introduces the concept of the nocturnal boundary layer, where heat loss concentrates within the lowest 10–30 meters.
It explains why radiation fog appears most often on calm, clear nights when surface temperatures drop faster than air above.
The article uses simplified Navier-Stokes approximations to show how vertical mixing stops once the layer becomes stably stratified.
Real-world examples include valley fog persistence due to cold-air drainage enhancing surface cooling further.
Unlike textbook explanations, it links fog onset timing directly to dew-point depression rates measured by weather balloons.
Diagrams illustrate how dew-point curves intersect with boundary-layer temperature profiles during critical cooling windows.
It clarifies why fog rarely forms over large lakes despite cold surfaces—their heat capacity prevents rapid radiative loss.
Educators praise its balance between mathematical insight and observable phenomena accessible to middle-school learners.
This independent piece stands alone yet deepens understanding of earlier chapters about dew and lake ice formation.