A 3-year study of cloud-to-ground lightning flash characteristics of Mesoscale convective systems over the Western Mediterranean Sea
A 3-year study of cloud-to-ground lightning flash characteristics of Mesoscale convective systems over the Western Mediterranean Sea
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DOI：
10.1016/j.atmosres.2005.05.002
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发表时间：
2006-02
影响因子：
5.5
通讯作者：
J. F. Correoso;E. Hernández;R. Garcia-Herrera;D. Barriopedro;D. Paredes
中科院分区：
文献类型：
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作者：
J. F. Correoso;E. Hernández;R. Garcia-Herrera;D. Barriopedro;D. Paredes
本文分析了西地中海地区33个中尺度对流系统的地闪特征。正CG比率的平均值为22%，正（负）CG多重性的平均值为1.1（2.4），正（负）CG闪光的峰值电流为17 kA（22.6 kA），平均闪光速率约为13 min− 1。阳性CG的百分比和阴性CG的多样性更高，而平均峰值电流低于以往的研究MCS。更详细的案例分析表明，不同类型的MCS的CG特征存在很大差异。文中还分析了与MCS有关的地闪的生命周期。MCS的生长阶段的特点是高CG闪电活动。正CG闪光速率通常在负CG闪光速率之前达到最大值。在这两种情况下，在MCS显示最大面积之前或之时记录峰值。最大闪光率和密度与MCS显示最低云顶温度的区域一致，因此显示最高的垂直发展。
In this paper cloud-to-ground (CG) lightning flashes of 33 Mesoscale Convective Systems (MCSs) over the Western Mediterranean area are analyzed. Mean values of 22% for the positive CG ratio, 1.1 (2.4) for positive (negative) CG multiplicity, 17 kA (22.6 kA) of peak current for the positive (negative) CG flashes and a mean flash rate of around 13 min−1are obtained. The percentage of positive CGs and the multiplicity of negative CG are higher, while the mean peak currents are lower than in previous studies on MCSs. A more detailed case analysis reveals that there are great differences among the CG characteristics of MCSs. The life cycle of CG lightning associated with MCSs is also analyzed. The growing stages of MCSs are characterised by high CG lightning activity. The positive CG flash rate generally reaches a maximum before the negative CG flash rate does. In both cases the peak is recorded before or when MCSs show the largest area. Maximum flash rate and densities coincide with the area where the MCS shows the minimum cloud-top temperatures and therefore shows highest vertical development.