@InProceedings{SalioCenNesVidVil:2019:EnCoAs,
author = "Salio, Paola Veronica and Cencelada, Maite and Nesbitt, Stephen W.
and Vidal, Luciano and Vila, Daniel Alejandro",
affiliation = "{Centro de Investigaciones del Mar y la Atmosfera} and {Centro de
Investigaciones del Mar y la Atmosfera} and {University of
Illinois at Urbana Champaign} and {Servicio Meteorologico
Nacional} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Environmental conditions associated to convective initiation of
extreme convective systems over Southeastern South America",
year = "2019",
organization = "AGU Fall Meeting",
abstract = "Many thunderstorms in Southeastern South America (SESA) stand out
in satellite observations as being among the strong on Earth in
terms of satellite-based convective proxies, such as lightning
flash rate per storm, the prevalence for extremely tall, wide
convective cores and broad stratiform regions. Knowing when and
where strong convection is initiated presenting a great interest
because of the close relationship between convective storms and
severe weather phenomena. This paper generates a novel methodology
to determine convective initiation areas associated with extreme
convective systems. Due to the lack of long records of
ground-based radars in the area, Rain Precipitation Features
(RPFs) from Global Precipitation Measurement and Tropical Rainfall
Measurement Mission are considered to determine extreme convective
events, as well as overshooting tops from GOES16 over
RELAMPAGO-CACTI field campaign. These different extreme convective
events generate a large sample allowing to determine convective
initiation areas over SESA during multiple years. All events are
tracked backward using an adaptive threshold area-overlapping
technique with thermal infrared (IR) channel. It was necessary to
consider multiple IR temperature thresholds in order to identify
areas of deep convection embedded within larger cloud clusters.
Convective initiation diurnal cycle is analyzed near principal
mountain barriers (Sierras de C{\'o}rdoba, central and
Northwestern Argentinean Andes), denoting a strong relationship
during the afternoon and early evening hours with convergence at
mountain ridges. It is also possible to detect convective
initiation areas over flat terrain, revealing with a strong
initiation signal on nocturnal times. Key features associated with
mesoscale and synoptic scale pre-environmental conditions are
analyzed over different samples considering initiation times and
mountain versus the surrounding plains regions.",
conference-location = "San Francisco, CA",
conference-year = "09-13 dec.",
language = "en",
targetfile = "salio_environmental.pdf",
urlaccessdate = "17 abr. 2024"
}