Electrical sensing of the dynamical structure of the planetary boundary layer
Electrical sensing of the dynamical structure of the planetary boundary layer
复制标题
行星边界层动力学结构的电传感
DOI：
10.1016/j.atmosres.2017.11.009
复制
发表时间：
2018
影响因子：
5.5
通讯作者：
Nicoll K
中科院分区：
文献类型：
--
作者：
Nicoll K
行星边界层内的湍流和对流过程是湿气、动量和颗粒物质输送的原因，但在确定低层大气的电荷输送方面也很重要。本文介绍了第一个高分辨率的垂直电荷廓线在晴朗的天气条件下，在2014年夏天在葡萄牙Alqueva的仪器无线电探空气球获得。气球飞行之间的短间隔（4小时）使边界层内电荷垂直分布的日变化得以详细研究，在稳定的夜间观察到的电荷（高达20 pC m− 3）比白天小得多。日出后，电荷分布的演变是复杂的，证明带电的超细气溶胶，白天对流上升。这产生了高达92 pC m− 3的电荷，距离地表500米。日变化的综合柱以上的网站跟踪密切与日变化的近表面电荷来自附近的电场传感器，确认表面电荷产生过程和高空之间的联系的重要性。当地气溶胶垂直廓线估计使用后向散射测量从并置云高计。这些被用于一个简单的模型，以计算由于垂直传导电流通过气溶胶层在全球电路中流动的预期电荷。这里提出的分析表明，电荷可以提供有关边界层传输的详细信息，特别是在超细气溶胶结构方面，传统的热力学和云高计测量不。
Turbulent and convective processes within the planetary boundary layer are responsible for the transport of moisture, momentum and particulate matter, but are also important in determining the electrical charge transport of the lower atmosphere. This paper presents the first high resolution vertical charge profiles during fair weather conditions, obtained with instrumented radiosonde balloons over Alqueva, Portugal during the summer of 2014. The short intervals (4 h) between balloon flights enabled the diurnal variation in the vertical profile of charge within the boundary layer to be examined in detail, with much smaller charges (up to 20 pC m− 3) observed during stable night time periods than during the day. Following sunrise, the evolution of the charge profile was complex, demonstrating charged ultrafine aerosol, lofted upwards by daytime convection. This produced charge up to 92 pC m− 3up to 500 m above the surface. The diurnal variation in the integrated column of charge above the site tracked closely with the diurnal variation in near surface charge as derived from a nearby electric field sensor, confirming the importance of the link between surface charge generation processes and aloft. The local aerosol vertical profiles were estimated using backscatter measurements from a collocated ceilometer. These were utilised in a simple model to calculate the charge expected due to vertical conduction current flow in the global electric circuit through aerosol layers. The analysis presented here demonstrates that charge can provide detailed information about boundary layer transport, particularly in regard to the ultrafine aerosol structure, that conventional thermodynamic and ceilometer measurements do not.
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注意：用于从气球平台测量大气电荷的自校准静电计。
DOI：
10.1063/1.4821500
发表时间：
2013
期刊：
The Review of scientific instruments
影响因子：
--
作者：
Keri A. Nicoll
通讯作者：
Keri A. Nicoll
影响因子：
5.2
作者：
HOPPEL, WA;FRICK, GM
通讯作者：
FRICK, GM
根据大气电测量确定涡流扩散系数
DOI：
--
发表时间：
1971
期刊：
影响因子：
--
作者：
W. Hoppel;S. Gathman
通讯作者：
S. Gathman
宇宙射线电离层云边缘充电的实验测定
影响因子：
5.2
作者：
Nicoll K
通讯作者：
Nicoll K
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
J. Cuxart;P. Bougeault;J. Redelsperger
通讯作者：
J. Redelsperger