Corrigendum: Saharan dust plume charging observed over the UK 2018 ( Environ. Res. Lett. 13 054018)
Corrigendum: Saharan dust plume charging observed over the UK 2018 ( Environ. Res. Lett. 13 054018)
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勘误表：2018 年在英国观察到的撒哈拉尘羽带电（Environ. Res. Lett. 13 054018）
DOI：
10.1088/1748-9326/aae591
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发表时间：
2018
影响因子：
6.7
通讯作者：
Harrison R
中科院分区：
文献类型：
--
作者：
Harrison R
2017年10月16日，一股撒哈拉尘埃和伊比利亚烟尘横扫英国南部，卷进了一个大西洋气旋，该气旋最初是飓风奥菲莉亚。人们普遍注意到了高空的尘埃，因为它的密度足以使太阳的视觉外观变红。雷丁和奇尔博顿天花板的后向散射时间序列显示有两个羽状物：一个向上带到2.5公里，另一个在800米以下进入边界层，中间有一个明显的狭缝。S−1约50厘米处粒子的稳定下降持续了整个上午，粗模粒子到达了表面。含有尘埃的羽流经常被观察到带有强烈的电荷，通常是通过摩擦效应。这股烟羽越过了布里斯托尔、奇尔博顿和雷丁的大气电场传感器。这三个地点的持续测量显示羽流电荷为负值。羽流的下缘电荷密度为(−8.0±3.3)nc m−2，比典型的层状水云的电荷密度高出数倍，表明存在湍流摩擦带电等活跃的就地电荷产生机制。世界协调时14点12分，一台测量温度和湿度的气象无线电探空仪被发射到烟柱中，专门配备了电荷和湍流传感器。在边界层和上部烟羽区域探测到了这种电荷，并在大气层最低的4公里处观察到了强烈的湍流混合。与模型值相比，粒子通过的透明狭缝区域异常干燥，下方的空气中断断续续地形成了水云。尘埃的电学方面应包括在数值模型中，特别是与电荷有关的对云微物理性质的影响，以准确地表示粒子的行为和传输。
A plume of Saharan dust and Iberian smoke was carried across the southern UK on 16th October 2017, entrained into an Atlantic cyclone which had originated as Hurricane Ophelia. The dust plume aloft was widely noticed as it was sufficiently dense to redden the visual appearance of the sun. Time series of backscatter from ceilometers at Reading and Chilbolton show two plumes: one carried upwards to 2.5 km, and another below 800 m into the boundary layer, with a clear slot between. Steady descent of particles at about 50 cm s− 1 continued throughout the morning, and coarse mode particles reached the surface. Plumes containing dust are frequently observed to be strongly charged, often through frictional effects. This plume passed over atmospheric electric field sensors at Bristol, Chilbolton and Reading. Consistent measurements at these three sites indicated negative plume charge. The lower edge plume charge density was (− 8.0±3.3) nC m− 2, which is several times greater than that typical for stratiform water clouds, implying an active in situ charge generation mechanism such as turbulent triboelectrification. A meteorological radiosonde measuring temperature and humidity was launched into the plume at 1412 UTC, specially instrumented with charge and turbulence sensors. This detected charge in the boundary layer and in the upper plume region, and strong turbulent mixing was observed throughout the atmosphere's lowest 4 km. The clear slot region, through which particles sedimented, was anomalously dry compared with modelled values, with water clouds forming intermittently in the air beneath. Electrical aspects of dust should be included in numerical models, particularly the charge-related effects on cloud microphysical properties, to accurately represent particle behaviour and transport.