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Hazards Earth Syst. Sci."],"abstract":"<jats:p>Abstract. Fire weather indices are used to assess the effect of weather on wildfire behaviour and to support fire management. Previous studies identified the high daily severity rating percentile (DSRp) as being strongly related to the total burnt area (BA) in Portugal, but it is still poorly understood how this knowledge can support fire management at a smaller spatial scale. The aims of this study were to (1)\u00a0assess whether the 90th DSRp (DSR90p) threshold is adequate for estimating most of the BA in mainland Portugal; (2)\u00a0analyse the spatial variability of the DSRp threshold that explains a large part of BA, at higher resolution; and, (3)\u00a0analyse whether vegetation cover can justify the DSRp spatial variability. We used weather reanalysis data from ERA5-Land, wildfire and land use data from Portuguese land management departments for an extended summer period (15\u00a0May to 31\u00a0October) from 2001 to 2019. We computed and related DSRp to large wildfires (BA\u2009&gt;\u2009100\u2009ha) and land use to clarify the effectiveness of the DSRp for estimating BA in Portugal and assess how vegetation influences it. Results revealed that the DSR90p is an adequate indicator of extreme fire weather days and BA in Portugal. In addition, the spatial pattern of the DSRp associated with most of the total BA shows variability at the municipality scale. Municipalities where large wildfires occur with more extreme weather conditions have most of the BAs in forests and are in coastal areas. By contrast, municipalities where large wildfires occur with less extreme weather conditions are predominantly covered by shrublands and are situated in eastern and inland regions. These findings are a novelty for fire science in Portugal and should be considered by fire managers and fire risk assessors.<\/jats:p>","DOI":"10.5194\/nhess-22-4019-2022","type":"journal-article","created":{"date-parts":[[2022,12,19]],"date-time":"2022-12-19T00:49:26Z","timestamp":1671410966000},"page":"4019-4037","source":"Crossref","is-referenced-by-count":18,"title":["Drivers of extreme burnt area in Portugal: fire weather and vegetation"],"prefix":"10.5194","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8240-3502","authenticated-orcid":false,"given":"Tom\u00e1s","family":"Calheiros","sequence":"first","affiliation":[]},{"given":"Akli","family":"Benali","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6603-7453","authenticated-orcid":false,"given":"M\u00e1rio","family":"Pereira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5201-9836","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Silva","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0164-249X","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Nunes","sequence":"additional","affiliation":[]}],"member":"3145","published-online":{"date-parts":[[2022,12,19]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Alberg, A. 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