Fires can overwinter underground, which can result in descendant embers known as 'zombie fires' popping up months later
the sky, the northern stretches of Siberia in early May were a splodgy white, their thinning winter snow cover interrupted by the brown veins of meandering rivers. Nestled within some of these curves, though, satellites picked up patches of soil warmer than the ground around them. The patches grew and multiplied as the month went on. Before it was over, some were visibly ablaze.
Last year’s inferno makes this year’s early-season hotspots and blazes particularly interesting. Fires can overwinter underground, particularly if they find their way to pockets of peat which offer the fire just enough oxygen for slow smouldering beneath the snow. After a wildfire singes a network of submerged layers of peat its descendant embers can pop up months later: though purists frown on the term, they have become known as “zombie fires”.
If the fires did overwinter, that is not in itself a bad omen; the Dutch study did not find that overwintering fires make a new year particularly fire-prone. Exceptional fire seasons are normally preceded by hot, dry early summers, as last year’s was. Happily, the ground around the Arctic Ocean currently appears wetter than average, except in the north-eastern-most reaches of Siberia.
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