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Characteristics of urban lightning hazards for Atlanta, Georgia

机译:佐治亚州亚特兰大市雷电危害特征

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Weather-related hazards are the result of interactions between the physical environment and the demographics of the community that experience them. Numerous studies have documented urban heat island (UHI) modification of cloud-to-ground lightning flash densities, but none have linked flashes to the underlying demographics. In this study, I compared flash and housing densities for 25 counties encompassing Atlanta, Georgia, using ordination and cartographic visualization. Over the interval 1992-2000, two densely populated suburban counties downwind from Atlanta (Gwinnett and Dekalb) exhibited the highest cloud-to-ground flash densities. By contrast, high population density counties located upwind ( Cobb) and encircling the central city (Fulton) had relatively lower flash densities. Based on the interactions among demographics, flash density, and geographic position for a subset of counties, I outline four types of urban lightning hazards: emergent, UHI-augmented, UHI-suppressed, and non-interactive. For urban lightning hazards, the often invoked idea of 'more people equals more hazards' is to an extent simplistic. Urban areas have a large range of lightning hazards as heating nodes emerge, intensify, and shift in response to historically contingent patterns of growth. [References: 38]
机译:与天气相关的危害是物理环境与经历这些危害的社区人口之间相互作用的结果。大量研究表明,城市热岛(UHI)可以修改云对地闪电的密度,但是没有一个将闪电与潜在的人口统计联系起来。在这项研究中,我使用排序和制图可视化功能比较了佐治亚州亚特兰大市等25个县的闪光和房屋密度。在1992年至2000年期间,亚特兰大顺风的两个郊区县(格温内特和迪卡尔布)展现出最高的云对地面闪光密度。相比之下,位于上风(科布)和环绕中心城市(富尔顿)的高人口密度县的闪光密度相对较低。根据人口统计数据,闪光强度和部分县的地理位置之间的相互作用,我概述了四种类型的城市雷电危害:紧急,UHI增强,UHI抑制和非交互。对于城市雷电危害,通常被称为“更多的人等于更多的危害”的想法在某种程度上是简单的。随着加热节点的出现,加剧和移动以响应历史上偶然的增长方式,城市地区会产生广泛的雷电危害。 [参考:38]

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