The electric influences from convective systems observed by the Multi-Radar Multi-Sensor (MRMS) system are studied using two years of vertical surface measured electric field (Ez) data collected at Texas A&M University–Corpus Christi from 2017 to 2019. A relationship between convective events and their effect on the local vertical electric field are established and confirm the importance of mixed phased precipitation processes and mixed phase ice mass in convective electrification.
The electric field data are collected from a Campbell Scientific CS-110 electric field mill located on campus at a sample rate of 1 Hz. The MRMS radar data are used to quantify the properties of convective systems, such as radar reflectivity derived ice mass, 18 and 30 dBZ echo top heights, as well as reflectivity at 0, –5, –10, –15, and –20 °C. These properties are correlated to the changing electric field after applying an inverse squared distance relationship.
In total 12 different case studies have shown the strongest correlation (r > 0.7) between the Ez and reflectivity at –20 °C, 30 dBZ echo top heights, and volume of –10 °C to –20 °C mixed phase region after weighting by the inverse distance squared. Though in general, a strong local electric field response to ice mass in mixed phase regions is found, the relationship varies from case to case due to neutralization of the electric field by lightning strikes and multiple cell interactions. The results of these case studies enhance our understanding of the influence of single and multi-cell convective events on the local vertical electric field, and their contribution to the atmospheric global electric circuit.
|Commitee:||Shinoda, Toshiaki, Xie, Feiqin|
|School:||Texas A&M University - Corpus Christi|
|School Location:||United States -- Texas|
|Source:||MAI 82/7(E), Masters Abstracts International|
|Keywords:||Convection, Electric field, Electrification, Ice, Radar, Storm|
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