The Relation of Environmental Conditions With Charge Structure in Central Argentina Thunderstorms
The Relation of Environmental Conditions With Charge Structure in Central Argentina Thunderstorms
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DOI：
10.1029/2021ea002193
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发表时间：
2022-04
影响因子：
3.1
通讯作者：
Bruno L. Medina;L. Carey;P. Bitzer;T. Lang;W. Deierling
中科院分区：
文献类型：
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作者：
Bruno L. Medina;L. Carey;P. Bitzer;T. Lang;W. Deierling
在这项研究中，我们探索了在Relampago-Cacti(利用自适应地面观测-云、气溶胶、复杂地形相互作用的电气化、闪电和中/微尺度过程的遥感)野外活动期间，在阿根廷科尔多瓦省雷暴中诱导主要电荷结构的环境条件。假设的环境条件与小的暖云停留时间和暖雨增长抑制有关，这导致混合相区云中液态水含量较高，从而有助于正电荷和异常电荷结构风暴的形成。利用无线电探空仪、云凝结核(CCN)地面仪器和再分析的数据，描述了具有异常和正常电荷结构的风暴的近距离流入空气的特征。与最初的假设一致，异常风暴具有较小的暖云深度，这是由于干燥的低层湿度和低0°C高度造成的。异常风暴与CCN浓度低于正常风暴有关，这与最初的预期相反。高开普率不是阿根廷异常风暴发展的重要条件，因为在为上升气流代理计算的不同参数中找不到与初始假设一致的明确模式。
In this study we explored the environmental conditions hypothesized to induce a dominant charge structure in thunderstorms in the province of Cordoba, Argentina, during the RELAMPAGO‐CACTI (Remote sensing of Electrification, Lightning, And Mesoscale/microscale Processes with Adaptive Ground Observations‐Clouds, Aerosols, Complex Terrain Interactions) field campaigns. Hypothesized environmental conditions are thought to be related to small warm cloud residence time and warm rain growth suppression, which lead to high cloud liquid water contents in the mixed‐phase zone, contributing to positive charging of graupel and anomalous charge structure storms. Data from radiosondes, a cloud condensation nuclei (CCN) ground‐based instrument and reanalysis were used to characterize the proximity inflow air of storms with anomalous and normal charge structures. Consistent with the initial hypothesis, anomalous storms had small warm cloud depth caused by dry low‐level humidity and low 0°C height. Anomalous storms were associated with lower CCN concentrations than normal storms, an opposite result to the initial expectation. High CAPE is not an important condition for the development of anomalous storms in Argentina, as no clear pattern could be found among the different parameters calculated for updraft proxy that would be consistent with the initial hypothesis.