Climate Change: Annual Wildfire Weather Season Has Increased by 14 Days

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    Climate Change: Annual Wildfire Weather Season Has Increased by 14 Days

    In a new study highlight how the risk of wildfire is rising globally due to climate change. The average length of the annual fire weather season has increased by 14 days per year between 1979 and 2019. The researchers say that virtually all world regions will experience unprecedented fire weather.

    Fire weather – the hot dry conditions conducive to wildfires – is increasing with climate change, raising the risk of large wildfires by making landscapes more susceptible to burn more often and more severely. The impacts of climate change on fire risk are predicted to escalate in future, with each added degree bringing enhanced wildfire risk.

    The study, conducted by an international team of researchers across institutions and led by the University of East Anglia in the UK, shows that anthropogenic climate change is a ‘push’ factor that enhances the risk of wildfires globally.

    Climate models suggest that in some world regions, for example the Mediterranean and Amazonia, the frequency of fire weather conditions in the modern period is unprecedented compared with the recent historic climate, due to human induced global warming of around 1.1°C.

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    More importantly, this will be the case in virtually all world regions if global temperatures reach 2-3°C of warming as per the current trajectory.

    Climate models have also shown that the likelihood of some of the most recent and catastrophic wildfires in the western US, Australia and Canada has been significantly greater due to historical climate change.

    The article, published on Thursday in the journal Reviews of Geophysics, involved scientists from UEA, Swansea University, the University of Exeter and Met Office in the UK, CSIRO Climate Science Centre in Australia, together with colleagues from the US, Germany, Spain and the Netherlands.

    Escalating fire risks

    The study explores the relationship between fire trends – past, present and future – and a range of controls on fire activity, including climate but also human activity, land use and changing vegetation productivity, which have with important impacts on the ignition of wildfires and their spread across landscapes.

    Lead author Dr Matthew Jones, of the Tyndall Centre for Climate Change Research at UEA, said: “Wildfires can have massive detrimental impacts on society, the economy, human health and livelihoods, biodiversity and carbon storage. These impacts are generally magnified in the case of forest wildfires.

    “Clarifying the link between forest wildfire trends and climate change is critical to understanding wildfire threats in future climates. Societies can either push with or pull against the rising risks of fire under of climate change, and regional actions and policies can certainly be important for preventing wildfires or reducing their severity.

    “Ultimately, though, we will be fighting the tide of escalating fire risks as the world warms further. Doubling down on efforts to cut greenhouse gas emissions and limiting warming to below 2°C is the most effective thing we can do to avoid the worst risks of wildfire on the global scale.”

    The authors highlight that humans have important regional effects on wildfire activity in a warming world. For example, they have increased fire ignitions and reduced the natural resilience of some ecosystems to fire, most notably in major tropical deforestation zones of Amazonia and Indonesia.

    Policies can help

    In contrast, humans have also reduced the spread of wildfire through naturally fire-prone landscapes by converting land to agriculture and fragmenting the natural vegetation, as seen in savannah grasslands in Africa, Brazil and Northern Australia during recent decades.

    They can also reduce unwanted ignitions or use firefighting to suppress wildfires, as historically done in forests of the US, Australia and Mediterranean Europe. However, the authors say this can have unintended consequences in regions where fire is a natural component of the functioning of ecosystems.

    For example, policies that aggressively excluded fire from the western US landscape during the 20th Century resulted in forests that are now overburdened with vegetation fuels, contributing to more severe wildfires during recent droughts. The use of low-intensity fires at times with safe weather conditions is increasingly viewed as an important tool for keeping fuels in check while also facilitating natural ecosystem functions.

    Key findings

    The length of the annual fire weather season has increased by 14 days per year (27%) during 1979-2019 on average globally and the frequency of days with extreme fire weather has increased by 10 days per year (54%) during 1979-2019 on average globally.

    Fire weather has also risen significantly in most world regions since the 1980s. Increases have been particularly pronounced in western North America, Amazonia and the Mediterranean. Fire weather has already emerged beyond its natural variability in the Mediterranean and Amazonia due to historical warming.

    At 2°C this will also be the case in the boreal forests of Siberia, Canada and Alaska and the temperate forests of the western US. At 3°C, virtually all world regions will experience unprecedented fire weather.

    Globally, the area burned by fires has decreased by around one-quarter – or 1.1 million square km –during 2001-2019. Much of the decrease – 590,000 km2 – has been in African savannahs, where 60-70% of the area burned by fire occurs annually. Local/regional human impacts have reduced the area burned by fire in tropical savannahs, in combination with lower grassland productivity during (increasingly drier) wet seasons.

    Large increases in burned area have been observed elsewhere, and especially in temperate and boreal forests. For example, the area burned by fire has increased by 21,400 km2 (93%) in east Siberian forests and by 3,400 km2 (54%) in the forests of western North America (Pacific Canada and US combined).

    Human factor

    Co-author Dr Cristina Santín, from Swansea University and the Spanish National Research Council, added: “Despite the fact that weather conditions promoting wildfire have already increased in nearly in every region the globe and will continue to do so, human factors still mediate or override the climatic ones in many regions.

    “We hope this research helps to resolve the entrenched and conflicting views on climate change versus land management being the root cause of these catastrophic fires.”

    The study assessed 500 previous research papers and carries out a re-analysis of state-of-the-art datasets from satellite observations and models. It includes analyses of trends in fire weather and burned area for world regions covering all countries, continental-scale macroregions, and key regional ecosystems for fire activity or impact.

    For these same regions, future changes in fire weather are examined at policy-relevant warming increments of 1.5°C, 2°C, 3°C and 4°C, providing insight into how the success or failure of climate policies correspond to the risks of wildfire we will need to live with in future.

    “Overall, climate change is exerting a pervasive upwards pressure on fire globally by increasing the frequency and intensity of fire weather, and this upwards pressure will escalate with each increment of global warming,” the researchers say in their paper. “Improvements to fire models and a better understanding of the interactions between climate, climate extremes, humans and fire are required to predict future fire activity and to mitigate against its consequences.”

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