In winter the ground cools, and the lower layers of the atmosphere also become cold.
On a cloudless night, the ground cools by radiating heat into space without heating the air adjacent to the ground.
The fog currently hanging over the UK is known as radiation fog - when the ground cools overnight, the air above it does too.
A large thermal gradient makes for stable air, which is why the wind often dies down at night, when the ground cools.
Passive cooling strategies of evaporative cooling, natural ventilation, ground cooling and radiant cooling were discussed by Santamouris (2007).
Because clouds reflect solar radiation, they keep the ground cooler during the day.
Figure 14c is the desiccant dehumidifier with an evaporative ground cooling system [40].
After the air dehumidification, the air could be cooled either evaporative cooling or such as ground cooling method.
Ground cooling utilization is possible due to the lower temperature of subsurface and ground in Philippines at around 19.4 °C [46].
A long-term declining trend is observed in the geothermal energy potential due to ground cooling.
