1 August 2015, Climate Network News, Wildfire threat spreads across warming world. As climate change warms the world vegetation dries, rainfall patterns waver and the threat of wildfire spreads. Wildfire – nature’s way of turning fallen vegetation into the next season’s nutrients – is a growing hazard. In the last 35 years, the wildfire season has grown longer by a fifth, and wildfire is now a threat to one fourth of all the plant-covered land on the planet. US researchers report in Nature Communications that since 1970 the number of days without rain has increased by well over one day every decade. William Jolly of the US Forest Service in Missoula, Montana and colleagues say they examined the fire season worldwide for the study period, taking into consideration all the factors that are used to calculate fire hazard: wind, humidity and temperature, as well as rainfall levels. They found that the combined changes in the surface weather have meant that the fire season has increased so far by 18.7%. Worldwide, wildfires sear, scorch or incinerate about 350 million hectares of ground cover every year. Changes in the rainfall patterns were a factor, with the number of rain-free days increasing by 1.31 days per decade. The season of smoke and cinders and smouldering stumps had been extended almost everywhere. Read More here
Tag Archives: Bushfire
20 July 2015, Science Daily, Changing climate lengthens forest fire season: Over a 35-year period, the length of forest fire seasons worldwide increased by 18.7 percent due to more rain-free days and hotter temperatures, according to research. The study examined weather data from 1979 through 2013 to determine how a changing climate impacts forest ecosystems. Over a 35-year period, the length of forest fire seasons worldwide increased by 18.7 percent due to more rain-free days and hotter temperatures, according to South Dakota State University professor Mark Cochrane, a senior scientist at the Geospatial Sciences Center of Excellence. The wildfire expert is part of a team of researchers led by W. Matt Jolly of the U.S. Forest Service Fire Science Laboratory that examined weather data from 1979 through 2013 to determine how a changing climate impacts forest ecosystems. “For things to burn, they have to have the proper conditions,” he explained. Four independent environmental factors increase the likelihood of wildfires — hotter temperatures, decreased relative humidity, more rain-free days and higher wind speeds. The researchers combined fire danger indexes from the United States, Canada and Australia with three global climate databases to create what Cochrane calls “an ensemble model.” They looked at the length of time and areas where conditions were conducive to fires. Their findings are published in Nature Communications. “Ecosystems are designed to withstand the normal climate situation, but we suspect that things aren’t normal anymore,” Cochrane said. On all the forested continents, except Australia, the fire seasons are getting longer, Cochrane explained. South America had the largest increase — 33 days in 35 years. In addition, the area affected by the longer fire season has doubled. Read More here
26 June 2015, CBS, California drought fueling wildfire flames: California firefighters are battling a new wildfire. The Sterling fire broke out Thursday in the San Bernardino Mountains, where firefighters have been battling flames for over a week. It has already burned at least 100 acres. It’s one of the more than 2,500 fires that have broken out in California so far this year, and gusty winds and drought conditions are fueling the flames. New data show the drought is designated as “extreme” or “exceptional” in more than 70 percent of California. That gives firefighters a new obstacle this year: searching for water.
Flying over the parched hills of Southern California, it’s clear how four years of drought has taken its toll, reports CBS News correspondent John Blackstone. “Normally at this time of year, we’d be seeing green and wildflowers as far as we can see. But because of the drought, we’re seeing brown, dry fuel that has no moisture in it at all,” Orange County fire Capt. Dave Lopez said. Lopez pointed to hills where a small fire could quickly grow into an inferno. The landscape is so dry, fires burn hotter and spread faster, making early attack from the air essential. But just as the drought has made the landscape flammable, it’s also dried up many of the water sources firefighters depend on to do their job. Read More here
3 May 2015, Climate News Network: US braces itself for even worse wildfire season. Years of drought and higher temperatures mean the chance of devastating wildfires in the southwest US is higher than ever − particularly in southern California. The firefighters are primed, hoses at the ready. May and June are often the peak months for forest fires in the southwest of the US, and the outlook for this year is grim. “I wish I could have some hope,” says Dr Wally Covington, director of the Ecological Restoration Institute at North Arizona University. “It’s just a terrible situation in southern California.” Read More here