FYKOS Year 36 Series 6 Problem 1 — canoeing mystery · FYKOS 36 #36.6.1
Physics · thermodynamics · optics
Problem
In sunny summer weather, we observe interesting wind behavior on the river
during the day. It is cold in the morning at sunrise, and sometimes there is
even morning fog. The fog then quickly dissipates, and the air temperature
rises. A light wind then blows up the river. In the evening, the situation
calms down, and the wind direction turns downstream as the sun lowers toward
the horizon. What causes this phenomenon? Explain the ongoing processes
in these two cases.