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Overwintering fires in boreal forests.

Rebecca C Scholten¹, Randi Jandt², Eric A Miller³

¹Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands. r.c.scholten@vu.nl.

|May 20, 2021

Summary

This summary is machine-generated.

Some forest fires smolder through winter and re-ignite in spring. Overwintering fires in boreal forests are linked to hot summers and deep organic soil burning, becoming more frequent.

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Area of Science:

Forest Ecology
Fire Science
Climate Change Impacts

Background:

Forest fires are typically analyzed within a single fire season.
Some fires exhibit overwintering behavior, smoldering through non-fire seasons and reigniting in spring.
Boreal forests, with deep organic soils and accelerating climate warming, may favor overwintering fires.

Purpose of the Study:

To investigate the extent and influencing factors of overwintering fires in boreal forests.
To understand the relationship between overwintering fires, climate conditions, and soil characteristics.

Main Methods:

Developed and applied an algorithm to detect overwintering fires in Alaska and the Northwest Territories.
Utilized field data and remote sensing datasets for fire detection and analysis.
Analyzed fire data from 2002 to 2018.

Main Results:

Overwintering fires are associated with hot summers, large fire years, and deep burning into organic soils.
These conditions, conducive to overwintering, have increased in frequency in recent decades.
While accounting for 0.8% of total burned area (2002-2018), overwintering fires reached 38% in one year.

Conclusions:

Overwintering fires are a significant phenomenon in boreal forests, linked to climate warming and specific fire conditions.
The spatiotemporal predictability of these fires can aid early detection by management agencies.
Early detection of overwintering fires can potentially reduce carbon emissions and firefighting costs.