Which of the following is NOT an effect of decreased atmospheric pressure at high elevations?

Decreased atmospheric pressure at high elevations is primarily associated with changes in air density and the behavior of various environmental factors. Among the choices provided, stating that an increased temperature is not a direct effect of decreased atmospheric pressure is accurate.

As altitude increases, air density decreases due to the thinning of the atmosphere. This lower air density leads to fewer air molecules available for heat retention, which typically results in cooler temperatures at higher elevations, especially in the absence of other heat sources. Although temperature can vary with different weather patterns and conditions, a general increase in temperature as a direct response to lower pressure is not typical.

The lower air density does enhance aspects like solar irradiance, as fewer air molecules allow solar energy to penetrate more effectively to the surface. This might lead to increased solar energy availability for solar panels, making them more efficient. Additionally, the idea that current from solar power systems can increase is also plausible, as more available sunlight coupled with efficient equipment can produce more electrical current.

Therefore, while decreased atmospheric pressure affects several parameters such as air density and enhances solar irradiance, it does not inherently result in increased temperatures at high elevations, making it the distinct choice in this context.