When fire risk is high, Arizonans are familiar with the main warning signs: high temperatures, low humidity, and strong winds. But a new study suggests that the most reliable measure of fire risk might come from the subsurface. Indeed, research conducted in Arizona has shown that subsurface meteorological conditions could be a more precise indicator of fire risk than surface conditions.
Subsurface Meteorological Conditions
Subsurface meteorological conditions refer to the temperatures, humidity, and winds that occur below the soil surface. These conditions can have a significant impact on fire risk because they can influence the amount of oxygen available for fires and the speed at which fires can spread. Researchers found that subsurface meteorological conditions in Arizona were particularly conducive to fires, with high temperatures and low humidity favoring combustion.
It is important to understand the scientific mechanisms that govern subsurface meteorological conditions. Indeed, the subsurface is a complex environment where temperatures, humidity, and winds interact in complex ways. Subsurface temperatures are influenced by soil thermal conductivity, which varies depending on soil composition and structure. Subsurface humidity is also influenced by the presence of aquifers and groundwater tables, which can feed fires. Subsurface winds, on the other hand, are influenced by terrain topography and the presence of faults and fractures.