Russia’s 2013 summer wildfire season has been a very active one, and may challenge the record-breaking 2012 wildfire season, which was most severe season Russia had faced in a decade. An unusual heat wave fueled the surge of fire activity in northern Siberia in July.
A persistent high-pressure weather pattern in the Russian Arctic—a blocking high—contributed to the heat wave, which saw temperatures reach 32° Celsius (90° Fahrenheit) in the northern city of Norilsk. For comparison, daily July highs in Norilsk average 16° Celsius (61° Fahrenheit). Blocking highs are so named because they block the jet stream from moving rain-bearing weather systems along their normal west-to-east path; this leads to “stuck” weather patterns with long periods of stable air and exceptional heat.
The map above shows land surface temperature anomalies for July 20–27, 2013. Rather than depicting absolute temperatures, the map shows how much the temperatures for that week differed from the long-term average for the area. The measurements were collected by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. Shades of red indicate temperatures that were warmer than average; blues are below average. Oceans, lakes, and areas with insufficient data (usually because of persistent clouds) appear in gray.
High temperatures play an important role in promoting wildfires. Warm fuels burn more readily than cooler fuels because less energy is required to raise their temperature to the point of ignition. With temperatures soaring in northern Russia, it was easier for previously active fires to continue burning and for lightning to spark new ones.
Not only are there a lot of fires in Russia this year, but many of the fires are burning in an unusual area. Most summer wildfires in Siberia occur south of the 57° North latitude line, along the southern edge of the taiga. The July 2013 fires are significantly north of that, raging in woodlands near the 65° North line.
This summer’s heat wave, like all extreme weather events, had its direct cause in a complex set of atmospheric conditions that produce short-term weather. However, weather occurs within the broader context of the climate, and there’s a high level of agreement among scientists that global warming has made it more likely that heat waves and wildfires of this magnitude will occur.
While temperatures are increasing globally, the warming in Russia since the mid-1970s has been more rapid than most areas—about .51°C per decade compared to about .17°C globally—according to a study by Anatoly Shvidenko of the International Institute for Applied Systems Analysis. Researchers expect a doubling in the number of forest fires in Russia’s taiga forests by the end of the century, as well as increases in the intensity of those fires.