Seasonal variation of the global electrical circuit
Seasonal variation of the global electrical circuit
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DOI：
10.1029/96jd01547
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发表时间：
1996-12-27
影响因子：
4.4
通讯作者：
Williams, ER
中科院分区：
文献类型：
--
作者：
Adlerman, EJ;Williams, ER
考虑了边界层气溶胶粒子对直流整体电路电场测量的影响。艾特肯(凝聚)核浓度被发现具有系统的局部季节变化，这掩盖了直流电路的全球行为。这些局部变化似乎是几个季节性因素的结果，包括大气混合层高度的变化，人为气溶胶产生率的变化，以及地面风速的变化。W.Cobb在毛纳罗亚(1977-1983年)进行的大气-地球传导电流测量似乎相对没有气溶胶粒子效应，毛纳罗亚是一个远离污染源的地点，大部分位于边界层以上。检查了莫纳罗亚的数据，发现气-地气流在北半球夏季达到峰值，与同一季节全球雷暴活动的峰值一致。对整个卡内基和莫德海洋数据集的重新分析以及正在进行的舒曼共振结果支持这一发现。然而，普遍缺乏明确的半年信号的问题仍未得到解决。
The effects of boundary layer aerosol particles on the electric field measurement of the DC global circuit are considered. Aitken (condensation) nuclei concentrations are found to have systematic local seasonal variations which obscure the global behavior of the DC circuit. These local variations appear to be the result of several seasonal factors, including variations in atmospheric mixed layer heights, variations in the productions rates of anthropogenic aerosols, and variations in surface wind speed. Air-Earth conduction current measurements made by W. Cobb at Mauna Loa (1977-1983), a site remote from sources of pollution and mostly above the boundary layer, appear to be relatively free of aerosol particle effects. The Mauna Loa data are examined and the air-Earth current is found to peak in the northern hemisphere summer, consistent with the peak of the global thunderstorm activity in the same season. A reanalysis of the entire Carnegie and Maud ocean data set as well as ongoing Schumann resonance results support this finding. However, the general absence of a distinct semiannual signal remains unresolved.