DOI: 10.1029/2017JD027540
Scopus记录号: 2-s2.0-85048995528
论文题名: Microphysical and Kinematic Processes Associated With Anomalous Charge Structures in Isolated Convection
作者: Fuchs B.R. ; Rutledge S.A. ; Dolan B. ; Carey L.D. ; Schultz C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 12 起始页码: 6505
结束页码: 6528
语种: 英语
英文关键词: charge structure
; convective processes
; lightning
; storm dynamics
; storm electrification
; storm microphysics
Scopus关键词: anomaly
; atmospheric convection
; cloud
; cloud microphysics
; Doppler effect
; electrification
; entrainment
; kinematics
; lightning
; probability
; storm
; Alabama
; Colorado
; United States
英文摘要: Microphysical and kinematic characteristics of two storm populations, based on their macroscale charge structures, are investigated in an effort to increase our understanding of the processes that lead to anomalous (or inverted charge) structures. Nine normal polarity cases (midlevel negative charge) with dual-Doppler and polarimetric coverage that occurred in northern Alabama and six anomalous polarity cases (midlevel positive charge) that occurred in northeastern Colorado are included in this study. The results show that even though anomalous polarity storms formed in environments with similar instability, they had significantly larger and stronger updrafts. Moreover, the anomalous polarity storms evidently have more robust mixed-phase microphysics, based on a variety of metrics. We infer positively charged graupel, and therefore high supercooled water contents, in the midlevels of the anomalous storms based on the relationship between colocations of graupel and inferred positive charge from Lightning Mapping Array data. Anomalous polarity storms in Colorado have much higher cloud base heights and shallower warm cloud depths in this study, leading us to hypothesize that anomalous polarity storms have lower amounts of dilution and entrainment. Using representative updraft speeds and warm cloud depths, the time required for a parcel to traverse from cloud base to the freezing level was estimated for each storm observation. We suggest that this metric is the key discriminator between the two storm populations and leads us to hypothesize that it strongly influences the amount of supercooled water and the probability of positive charge in the midlevels, leading to an anomalous charge structure. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113676
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Department of Atmospheric Science, University of Alabama in Huntsville, Huntsville, AL, United States; National Aeronautics and Space Administration George C. Marshall Space Flight Center, Huntsville, AL, United States
Recommended Citation:
Fuchs B.R.,Rutledge S.A.,Dolan B.,et al. Microphysical and Kinematic Processes Associated With Anomalous Charge Structures in Isolated Convection[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(12)