Peatlands – which make up around three-percent of the Earth’s land surface and store approximately 25-percent of the world’s soil carbon – are deposits of plant material and organic matter mixed with soil that is too wet to support high levels of decomposition. Peatlands are found on all seven continents. Already the largest fires on Earth in terms of their carbon footprint, these smoldering fires burn through thick layers of peat, built up over thousands of years, which blanket the ground in ecosystems ranging from the tropics to the arctic.
"When people picture a forest fire, they probably think of flames licking up into tree tops, and animals trying to escape,” said the study’s lead author Merritt Turetsky, a professor of Integrative Biology at University of Guelph in Ontario, Canada. “But peat fires tend to be creeping ground fires. They can burn for days and weeks, even under relatively wet conditions. They lack the drama of flames, but they produce a lot of smoke.”
That smoke contains large amounts of carbon and makes peat fires dangerous to human health. It can worsen air quality and even trigger asthma and other respiratory problems. “In addition to the amount of carbon released, the types of emissions also can make smoldering fires of greater concern than fires where most of the combustion takes place in flames,” said Watts, who is studying the emissions from burning peat and many other types of organic fuels with his DRI colleagues to determine their potential effects in the atmosphere and on our global climate.
“Peat fires are an example of wildfires having effects far beyond the areas where they occur, and these effects can last for a very long time,” he added....