Convective potential and fuel availability complement near-surface weather in regulating global wildfire activity.

Area of Science:

• Environmental Science
• Atmospheric Science
• Ecology

Background:

• Wildfire activity is traditionally linked to meteorological conditions like heat, dryness, wind, and lack of rain.
• Current wildfire forecasting models often underrepresent the critical roles of ignition sources and fuel availability.
• Near-surface weather conditions provide only a partial understanding of wildfire dynamics.

Purpose of the Study:

• To investigate the influence of atmospheric convection and fuel abundance on wildfire occurrence and intensity.
• To determine if these factors offer complementary insights beyond near-surface weather in wildfire prediction.
• To enhance the accuracy of daily to seasonal wildfire forecasts and predictions.

Main Methods:

• Analysis of satellite measurements.
• Utilizing atmospheric reanalysis data.
• Comparing meteorological data with wildfire ignition, spread, and fuel load data.

Main Results:

• Near-surface weather alone partially explains wildfire occurrence and intensity.
• Enhanced atmospheric convection was observed during ignition and spreading in over 40% of low-human-impact regions and 61% of global burnable areas.
• Increased fuel load in shrublands (56%) and grasslands (54%) correlated with actual fire occurrences.

Conclusions:

• Atmospheric convection and fuel abundance are significant, complementary factors in regulating wildfire processes.
• Incorporating convection and fuel data can significantly improve wildfire forecast and prediction models.
• Future wildfire prediction strategies must consider the interplay between atmospheric changes and terrestrial factors like fuel availability.