Tag Archives: Bushfire

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12 September 2016, Climate News Network, Western US faces wildfires explosion. Wildfires used to hit California only in the latter part of the year, but changing climate and persistent drought mean they are now a constant threat. The blackened tree stumps stand out against a clear blue sky. The land is burned, and there is a smell of charcoal and ash in the air. People in this area are used to wildfires, but as California and much of the western US endures its fifth year of severe drought, residents are wondering when there will be any respite from the flames and smoke. Mike Mohler, a battalion chief with the state’s Department of Forestry and Fire Protection, says that although there was substantial rainfall in northern California earlier this year, those five drought years mean there is no moisture in the vegetation. “When we get these fires now, we are seeing what we call explosive fire growth,” Mohler told the NPR radio network. “And now the explosive fire growth statewide is unfortunately the new normal. We’re seeing fire conditions that are unprecedented. In my 22 years [in the fire service], I haven’t seen fire move like I have this year.” Read More here

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5 September 2016, DESMOG, Climate Impacts: Melting Glaciers, Shifting Biomes and Dying Trees in US National Parks. Trees are dying across Yosemite and Yellowstone national parks. Glaciers are melting in Glacier Bay National Park and Preserve in Alaska. Corals are bleaching in Virgin Islands National Park. Published field research conducted in U.S. national parks has detected these changes and shown that human climate change – carbon pollution from our power plants, cars and other human activities – is the cause. As principal climate change scientist of the U.S. National Park Service, I conduct research on how climate change has already altered the national parks and could further change them in the future. I also analyze how ecosystems in the national parks can naturally reduce climate change by storing carbon. I then help national park staff to use the scientific results to adjust management actions for potential future conditions. Research in U.S. national parks contributes in important ways to global scientific understanding of climate change. National parks are unique places where it is easier to tell if human climate change is the main cause of changes that we observe in the field, because many parks have been protected from urbanization, timber harvesting, grazing and other non climate factors. The results of this research highlight how urgently we need to reduce carbon pollution to protect the future of the national parks. Melting Glaciers, Dying Trees Human-caused climate change has altered landscapes, water, plants and animals in our national parks. Research in the parks has used two scientific procedures to show that this is occurring: detection and attribution. Detection is the finding of statistically significant changes over time. Attribution is the analysis of the different causes of the changes. Around the world and in U.S. national parks, snow and ice are melting. Glaciers in numerous national parks have contributed to the global database of 168 000 glaciers that the Intergovernmental Panel on Climate Change (IPCC) has used to show that human climate change is melting glaciers. Field measurements and repeat photography show that Muir Glacier in Glacier Bay National Park and Preserve in Alaska lost 640 meters to melting from 1948 to 2000. Read More here

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22 August 2016, The Conversation, New modelling on bushfires shows how they really burn through an area. Bushfires in Australia can have a devastating impact on an environment and destroy homes and lives, so any effort to prevent them is a welcome move. But the way that we have traditionally understood bushfires and forest flammability in Australia is not up to the challenges of our changing climate. Thankfully, a new approach is making sense of the confusion by looking at the plants themselves. Unfortunately though, time is running out. Years ago I could stand on a ridge in the mountains as winter gales roared through the Alpine Ash forests on the slopes below me. There’d be black cockatoos on the wind and the first hard snow flakes rattling on my coat. It was a wildness that stung the eyes with raw beauty. Sadly those forests are dying. They are being burnt so often that they may be gone by the end of the century. Like the tallest hardwoods in the world and the thousand year old King Billy pines of Tasmania, they are places we have no room for in our fossil fuel economy. It’s not that fire is bad; our forests need it. But it’s coming so hard and fast in this changing climate. We fight the fires and we manage the fuels as best we can, but our best efforts are only as good as the science they are built on, and there are some hard questions to be asked about that science. Read More here

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2 June 2016, The guardian, Spike in Alaska wildfires is worsening global warming, US says Report from US Geological Survey says northern wildfires must now be seen as significant driver of climate change, not just a side-effect. The devastating rise in Alaska’s wildfires is making global warming even worse than scientists expected, US government researchers said on Wednesday. The sharp spike in Alaska’s wildfires, where more than 5 million acres burned last year, are destroying a main buffer against climate change: the carbon-rich boreal forests, tundra and permafrost that have served as an enormous carbon sink. Northern wildfires must now be recognised as a significant driver of climate change – and not just a side-effect, according to the report from the US Geological Survey. “This is one of the surprises that we haven’t talked about much,” said Virginia Burkett, chief climate scientist at the USGS. “It has tremendous implications for the carbon that is locked up in Alaska soils and vegetation.” A record wildfire year – such as 2015 which was the worst in Alaska for a decade – had a measurable effect on the release of carbon dioxide and methane, which are the main drivers of climate change. “Our scientists found that the balance of carbon storage versus release in Alaska was strongly linked with wildfires,” Burkett said. “In years where there was high wildfire activity the net carbon balance declined dramatically, and then it would rebuild in the absence of fire.” Alaska is a far bigger storehouse for carbon than the lower 48 states, according to the USGS. The state’s boreal forests, peat-rich tundra, and permafrost hold about 53% of US carbon. Alaska accounts for about 18% of US land mass. Alaska currently absorbs about 3.7m tonnes of carbon a year, the USGS assessment found. But that vast storehouse of carbon has been breached by warming temperatures, thawing permafrost – and wildfire. Read More here