Climate change projected fire weather sensitivity: California Santa Ana wind occurrence

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Oceanography: Physical: Nearshore Processes, Paleoceanography: Atmospheric Transport And Circulation, Paleoceanography: Global Climate Models (1626, 3337), Paleoceanography: Greenhouse Gases, Planetary Sciences: Solid Surface Planets: Meteorology (3346)

Scientific paper

A new method based on global climate model pressure gradients was developed for identifying coastal high-wind fire weather conditions, such as the Santa Ana Occurrence (SAO). Application of this method for determining southern California Santa Ana wind occurrence resulted in a good correlation between derived large-scale SAOs and observed offshore winds during periods of low humidity. The projected change in the number of SAOs was analyzed using two global climate models, one a low temperature sensitivity and the other a middle-temperature sensitivity, both forced with low and high emission scenarios, for three future time periods. This initial analysis shows consistent shifts in SAO events from earlier (September-October) to later (November-December) in the season, suggesting that SAOs may significantly increase the extent of California coastal areas burned by wildfires, loss of life, and property.

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