Natural Hazards and Earth System Sciences
Natural Hazards and Earth System Sciences
NHESS
Articles | Volume 26, issue 3
Articles | Volume 26, issue 3
https://doi.org/10.5194/nhess-26-1479-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-26-1479-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 3
Research article
 | 
24 Mar 2026
Research article |  | 24 Mar 2026

What controls fire size in the South American Gran Chaco? Exploring atmospheric and landscape drivers through Remote Sensing

Rodrigo San Martín, Catherine Ottlé, Anna Sorenssön, Pradeebane Vaittinada Ayar, Florent Mouillot, and Marielle Malfante

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Short summary
We studied wildfires in the Gran Chaco, one of the world’s largest dry forests, to understand why some fires become much larger than others. By analyzing thousands of fires together with environmental and landscape data, we found that fire size is mainly shaped by topography and vegetation structure, which determine how continuous fuels are across the landscape. Weather and human factors play a secondary role in explaining final fire size.
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