文章基本信息

标题：Santa Ana Winds of Southern California Impact PM 2.5 With and Without Smoke From Wildfires
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作者：Rosana Aguilera ; Alexander Gershunov ; Sindana D. Ilango 等
期刊名称：GeoHealth
印刷版ISSN：2471-1403
电子版ISSN：2471-1403
出版年度：2020
卷号：4
期号：1
页码：1-9
DOI：10.1029/2019GH000225
语种：English
出版社：John Wiley & Sons, Ltd
摘要：Key PointsSanta Ana winds have a predominant ventilation effect as background PM2.5is transported offshore from highly polluted areasA polluting effect occurs when SAWs spread smoke PM2.5from wildfires inland toward the coastal regionStatistical approaches that relate surface wind and PM2.5over space and time can help in identifying wildfire PM2.5AbstractFine particulate matter (PM2.5) raises human health concerns since it can deeply penetrate the respiratory system and enter the bloodstream, thus potentially impacting vital organs. Strong winds transport and disperse PM2.5, which can travel over long distances. Smoke from wildfires is a major episodic and seasonal hazard in Southern California (SoCal), where the onset of Santa Ana winds (SAWs) in early fall before the first rains of winter is associated with the region's most damaging wildfires. However, SAWs also tend to improve visibility as they sweep haze particles from highly polluted areas far out to sea. Previous studies characterizing PM2.5in the region are limited in time span and spatial extent, and have either addressed only a single event in time or short time series at a limited set of sites. Here we study the space‐time relationship between daily levels of PM2.5in SoCal and SAWs spanning 1999–2012 and also further identify the impact of wildfire smoke on this relationship. We used a rolling correlation approach to characterize the spatial‐temporal variability of daily SAW and PM2.5. SAWs tend to lower PM2.5levels, particularly along the coast and in urban areas, in the absence of wildfires upwind. On the other hand, SAWs markedly increase PM2.5in zip codes downwind of wildfires. These empirical relationships can be used to identify windows of vulnerability for public health and orient preventive measures.
关键词：PM2.5air qualitySanta Ana windswildfire smokeSouthern California