Much of our understanding of atmospheric nitrogen deposition (AD) is based on important monitoring networks, such as the National Atmospheric Deposition Program (NADP) in the United States (US). However, it is likely that rural-based monitoring data are unrepresentative of reactive nitrogen concentrations found in urban areas. In this study, event-based precipitation was collected over one-year in Providence, RI - a mid-sized city situated at the head of Narragansett Bay, the largest estuary in the northeastern US Significant concentration enhancements in inorganic nitrogen (i.e., ammonium and nitrate) were found for wet deposition in the urban area compared to nearby NADP rural and non-urban coastal monitoring sites. Moreover, the annual ratio of ammonium to nitrate was highest in urban precipitation (>1.0). From 164 precipitation events, the mean volume-weighted ammonium and nitrate concentrations were 32.9 μ mol l −1 and 28.4 μ mol l −1 , res...

中文翻译：

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美国城市沿海地区的高浓度大气无机氮沉积

我们对大气氮沉积（AD）的大部分理解是基于重要的监测网络，例如美国（US）的国家大气沉积计划（NADP）。但是，基于农村的监测数据可能无法代表城市地区的活性氮浓度。在这项研究中，基于事件的降水是在RI普罗维登斯（Providence）收集的，该普罗维登斯是位于美国东北部最大的河口Narragansett湾顶部的中型城市，无机氮（例如铵盐和与附近的NADP农村和非城市沿海监测点相比，在市区发现了湿沉降。此外，城市降水中铵与硝酸盐的年比例最高（> 1.0）。根据164次降水事件，