Electrical signature in polar night cloud base variations
Electrical signature in polar night cloud base variations
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DOI：
10.1088/1748-9326/8/1/015027
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发表时间：
2013-03
影响因子：
6.7
通讯作者：
R. Harrison;M. Ambaum
中科院分区：
文献类型：
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作者：
R. Harrison;M. Ambaum
云层覆盖全球。它们的下边缘被垂直流过它们的晴天大气电流带负电荷。使用极地冬季表面气象数据从Sodankylä（芬兰）和哈雷（南极洲），我们发现，当气象日变化很弱，一个明显的日周期，平均而言，持续在云底高度，使用激光云高计检测。从这两个网站的昼夜云底高度更密切相关的卡内基曲线的全球大气电比当地气象测量。云底的敏感性在北方和南半球之间没有区别，晴天电流密度每变化1%，云底的敏感性平均升高（4.0 ± 0.5）m。这表明，受空间天气、宇宙射线和厄尔尼诺南方涛动影响的全球晴天气流与云层特性有关。
Layer clouds are globally extensive. Their lower edges are charged negatively by the fair weather atmospheric electricity current flowing vertically through them. Using polar winter surface meteorological data from Sodankylä (Finland) and Halley (Antarctica), we find that when meteorological diurnal variations are weak, an appreciable diurnal cycle, on average, persists in the cloud base heights, detected using a laser ceilometer. The diurnal cloud base heights from both sites correlate more closely with the Carnegie curve of global atmospheric electricity than with local meteorological measurements. The cloud base sensitivities are indistinguishable between the northern and southern hemispheres, averaging a (4.0 ± 0.5) m rise for a 1% change in the fair weather electric current density. This suggests that the global fair weather current, which is affected by space weather, cosmic rays and the El Niño Southern Oscillation, is linked with layer cloud properties.