@Article{MattosMaWiGoBlBa:2017:ElLiCy,
author = "Mattos, Enrique Vieira and Machado, Luiz Augusto Toledo and
Williams, Earle R. and Goodman, Steven J. and Blakeslee, Richard
J. and Bailey, Jeffrey C.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Massachusetts
Institute of Technology} and {NOAA/NESDIS/GOES-RProgram Office}
and {NASA Marshall Space Flight Center} and {University of Alabama
in Huntsville}",
title = "Electri\fication life cycle of incipient thunderstorms",
journal = "Journal of Geophysical Research: Atmospheres",
year = "2017",
volume = "122",
number = "8",
pages = "4670--4697",
month = "Apr.",
keywords = "dual-polarization radar, first cloud-to-ground lightning flash,
first radar echo, graupel, Lightning Localization System,
supercooled raindrops.",
abstract = "This work evaluates how clouds evolve to thunderstorms in terms of
microphysical characteristics to produce the first intracloud (IC)
and cloud-to-ground (CG) lightning flashes. Observations of 46
compact isolated thunderstorms during the 2011/2012 spring-summer
in Southeast Brazil with an X-band polarimetric radar and two- and
three-dimensional Lightning Location Systems demonstrated key
parameters in a cloud's vertical structure that produce the
initial electrification and lightning activity. The majority (98%)
of the first CG flashes were preceded (by approximately 6 min) by
intracloud (IC) lightning. The most important aspect of the
observations going into this paper, which came originally from the
visual examination of a large number of thunderstorms, is that an
initial positive differential reflectivity (ZDR) (associated with
supercooled raindrops) evolved to reduced ZDR (and even negative
values) in the cloud layer between 0° and to \−15°C before
and during the time of the initial lightning, suggesting evolution
from supercooled raindrops to frozen particles promoting the
formation of conical graupel. An enhanced negative specific
differential phase (KDP) (down to \−0.5° km\−1) in
the glaciated layer (above \−40°C) was predominantly
observed at the time of the first CG flash, indicating that ice
crystals, such as plates and columns, were being vertically
aligned by a strong electric field. These results demonstrate that
the observations of ZDR evolution in the mixed layer and negative
KDP in the upper levels of convective cores may provide useful
information on thunderstorm vigor and lightning nowcasting.",
doi = "10.1002/2016JD025772",
url = "http://dx.doi.org/10.1002/2016JD025772",
issn = "2169-8996 and 2169-897X",
language = "en",
targetfile = "mattos_electrification.pdf",
urlaccessdate = "27 abr. 2024"
}