Assessing the role played by meteorological conditions on the interannual variability of fire activity in four subregions of Iberia

• Main Author: Nunes, Sílvia A.
• Publication Date: 2023
• Other Authors: DaCamara, Carlos C., Pereira, José M. C., Trigo, Ricardo M.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10400.5/29331
• topic: fire activity; Fire Radiative Power (FRP); Fire Weather Index (FWI); Iberian Peninsula; meteorological conditions; Moderate Resolution Imaging Spectroradiometer (MODIS); two generalised Pareto tail lognormal body distribution; wildfires

The Iberian Peninsula is recurrently affected by severe wildfires resulting from an interplay of human activities, landscape features and atmospheric conditions. Aims. The role played by atmospheric conditions on wildfire activity in 2001–2020 is assessed in four pyror- egions of the Iberian Peninsula. Methods. Wildfire activity is characterised by Fire Radiative Power (FRP) and meteorological danger is rated by the Fire Weather Index (FWI). The distribution of log 10 FRP in each pyroregion consists of a truncated lognormal central body with Generalised Pareto distributions as tails, and the model is improved using FWI as covariate. Synthetic time series of total annual FRP are generated using the models with and without FWI as covariate, and compared against observed FRP. Key results. Pyroregions NW, N, SW and E present increases of 1, 5, 6 and 7% in interannual explained variance of FRP when progressing from the model without to that with FWI as covariate. Conclusions. The models developed characterise the role of meteorological conditions on fire activity in the Iberian Peninsula, and are especially valuable when comparing expected impacts for different scenarios of climate change. Implications. The largest effects of atmospheric conditions on fire activity are in regions of the IP where the strongest impact of climate change is expected