DOI: 10.1029/2018JD029006
Scopus记录号: 2-s2.0-85052810942
论文题名: Variations of Thunderstorm Charge Structures in West Texas on 4 June 2012
作者: Chmielewski V.C. ; Bruning E.C. ; Ancell B.C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 17 起始页码: 9502
结束页码: 9523
语种: 英语
英文关键词: electrification
; entrainment
; thunderstorm
英文摘要: This study documents an environment for which small changes therein significantly impacted electrification and for which current theories of electrification lacked the ability to discriminate storm polarity. Thirty single-cell and multicell storms from 1900 to 2200 UTC on 4 June 2012 over a 150- by 100-km West Texas region were examined. Some of these storms had anomalous charge structures (primarily positive charge in the midlevels at −10 °C to −30 °C or 6.3 to 8.8 km above MSL locally) and some normal (primarily negative at midlevels), even though they existed concurrently and did not statistically differ in overall flash sizes, flash rates, radar volume, or echo top height. Overall, the normal storms ingested lower equivalent potential temperature surface air and were estimated to experience lower convective available potential energy than the anomalous storms, as observed in other studies. They were, however, estimated to have smaller warm cloud depth and surface dew point temperatures, contrary to expectations. Significant overlap between the storm environments suggested that lower instability may have contributed to some storms becoming normally electrified, but it was not a sufficient condition. Additionally, there had been previous convection in the region dominated by normal-polarity storms. A Weather Research and Forecasting ensemble suggested that the previous convection moistened the midlevels of the atmosphere near cloud base. We propose that future studies investigate dry-air entrainment as an additional, intertwined environmental factor that could decrease droplet sizes and effective warm rain processes, promoting positive graupel charging in the midlevels and anomalous charge structures. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113194
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geosciences, Texas Tech University, Lubbock, TX, United States
Recommended Citation:
Chmielewski V.C.,Bruning E.C.,Ancell B.C.. Variations of Thunderstorm Charge Structures in West Texas on 4 June 2012[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(17)