This leads to drop in air temperature, an increase in relative humidity and a possible reduction in photosynthetic active radiation (Briffa et al., 1998b; Battipaglia et al., 2007; D'Arrigo et al., 2013).
A sudden drop in air temperature frequently occurred over the sea at nighttime and was caused by precipitation cooling.
The spouting pressure drop, outlet air temperature, and relative humidity were measured over time under different conditions.
Therefore, the rapid drop in air temperature over the sea at nighttime can be attributed to precipitation cooling of the lower atmosphere.
From Fig. 5, it can be seen that a sudden drop in air temperature occurred from the late afternoon to nighttime prior to the local active phase of the MJO, accompanied by the occurrence of precipitation at the observation site.
Their results suggest that the evaporative cooling from convection associated with rain, which frequently occurs in the afternoon on the island, causes a rapid drop in air temperature in the lower atmosphere in the evening.
Sudden drops in surface air temperature occurred frequently on the island in the late afternoon and over the sea at nighttime, accompanied by precipitation.
In addition, with the same vegetation coverage, the effectiveness of air temperature dropping of the whole region differed according to the arrangement position.
Also, for increasing the reactivation air inlet temperature from 70 °C to 110 °C, supply air temperature dropped from 15.9 °C to 10.9 °C, supply air relative humidity dropped from 82.7% to 71.8%, and thermal COP dropped from 4.5 to 1.7.
If the drop in air temperatures was caused by radiative cooling of the sea surface, the decrease in air temperatures should have continued until the following morning, because radiative cooling would continue throughout the nighttime.
