Urban and rural measurements of atmospheric potential gradient
Urban and rural measurements of atmospheric potential gradient
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DOI：
10.1016/j.elstat.2018.11.006
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发表时间：
2019-01-01
影响因子：
1.8
通讯作者：
Shallcross, D. E.
中科院分区：
文献类型：
--
作者：
Matthews, J. C.;Wright, M. D.;Shallcross, D. E.
2016年5月19日至6月24日，在英国布里斯托尔地区的三个站点测量了大气势梯度。两个地点位于布里斯托尔市的屋顶上，彼此相距800米，而第三个地点位于南部17公里的农村地区。两个屋顶城市站点的电位梯度测量值显示出很大的时间相似性，这意味着可以假设屋顶测量值代表当地的城市区域。频域分析表明，在城市站点存在半天的周期，而在农村站点没有观察到，这与显示交通气溶胶对潜在梯度测量影响的其他研究相一致。两个城市站点之间的相关性不受气溶胶浓度增加的影响。删除降雨期间以及雨前和雨后一小时的数据，删除了一些典型扰动天气的较大的势梯度变化。然而，势梯度的大变化仍然存在，表明不应仅依靠降雨作为非公平天气势梯度的指标。
Atmospheric potential gradient was measured at three sites within the Bristol area of the UK between 19th May and 24th June 2016. Two sites were on rooftops within the city of Bristol, 800 m apart from each other, while the third was in a rural location 17 km to the south. Potential gradient measurements at the two rooftop urban sites showed great temporal similarity, implying that a rooftop measurement may be assumed to represent the local urban area. Frequency domain analysis indicated a half-day cycle in the urban sites that was not observed in the rural site, consistent with other studies showing the effect of traffic aerosol on potential gradient measurements. The correlation between the two urban sites was not affected by an increase in aerosol concentration. Removal of data during rainfall, as well as one hour before and after rain, removed some of the larger changes in potential gradient typical of disturbed weather. However, large changes of potential gradient still existed, showing that rainfall alone should not be relied upon as an indicator of a non-fair weather potential gradient.