@InProceedings{TavaresRPTBSTCHP:2007:IRTeCh,
author = "Tavares, Fernanda de S{\~a}o Sabbas and Rampinelli, T. and
Pautet, P. and Taylor, M. and Bailey, M. and Solorzano, N. N. and
Thomas, J. N. and Cummer, S. A. and Holzworth, R. H. and Pinto,
Osmar",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and {}
and {Utah State University} and {Utah State University} and
{Digipen Institute of Technology} and {} and {Duke University} and
{University of Washington} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "IR Temperature Characteristics of a Prolific TLE Producing Storm
in South America Observed During a Sprite Campaign in Brazil",
year = "2007",
organization = "2007. Fall Meeting",
address = "AGU",
keywords = "Lightning, Paleoclimatology, Ionization processes.",
abstract = "A total of 445 Transient Luminous Events, TLEs, were observed
above a Mesoscale Convective System, MCS, over Argentina on the
night of 22-23 February, 2006, during the third sprite campaign
ever conduced in Brazil. We investigated the temporal-spatial
evolution of the cloudtop temperature of the MCS based on
satellite infrared imagery and their relationship with
cloud-to-ground lightning and TLE activity. We used the same
methodology S{\~a}o Sabbas and Sentman [2003] applied to a US
sprite producing MCS and compared the results. The Argentinean
thunderstorm was a mesoscale system with very different
characteristics than regular TLE producing MCSs. It originated
from the merge of several convective storms that remained as
collection of {"}isolated{"} convective regions (Tc < -52o C)
under a common cloud cover (Tc < - 32o C) throughout its lifetime.
We started to record TLEs at least 3 hr before the system could be
classified as an MCS and the temperature of the cloud cover, ~
-52o C, was at ~15 o C higher than of the US MCS. Most of the
lightning tended to occur at the borders of the convective cores
instead of occurring at the cores themselves. Another difference
was that while the US MCS produced sprites only in the back
region, the Argentina system produced sprites/TLEs both in the
back and front regions. The sprites occurred above regions with ~
-40o C in the beginning of the observations and with ~ -58o C at
the end. This also differs from the US case study, in which all
sprites happened above regions with ~ -70o C and ~ -64o C. The
main similarity was that in the growth phase the lightning
occurrence rate increased in association with regions with
decreasing cloudtop temperatures (~ -50o C to ~ -58o C ), until a
maximum rate was reached in association with minimum temperatures,
however in the US MCS the temperatures involved were lower (~ -64o
C to ~ -70o C). Another interesting similarly between the US and
Argentina MCSs is that both moved towards Northeast at ~85 km/h
and ~45 km/h, respectively. The overall development of this system
was very.",
conference-location = "San Francisco, CA",
conference-year = "10-14 Dec.",
language = "en",
organisation = "AGU",
urlaccessdate = "15 jun. 2024"
}