@Article{CanceladaSalVilNesVid:2020:MeDeEx,
author = "Cancelada, Maite and Salio, Paola and Vila, Daniel Alejandro and
Nesbitt, Stephen W. and Vidal, Luciano",
affiliation = "{Universidad de Buenos Aires} and {Universidad de Buenos Aires}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{University of Illinois at Urbana-Champaign} and Servicio
Meteorol{\'o}gico Nacional, Buenos Aires",
title = "Backward Adaptive Brightness Temperature Threshold Technique
(BAB3T): a methodology to determine extreme convective initiation
regions using satellite infrared imagery",
journal = "Remote Sensing",
year = "2020",
volume = "12",
number = "2",
pages = "e337",
month = "jan.",
keywords = "convective initiation, satellite observations, algorithms, severe
weather.",
abstract = "Thunderstorms in southeastern South America (SESA) stand out in
satellite observations as being among the strongest 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. Accurately
quantifying when and where strong convection is initiated presents
great interest in operational forecasting and convective system
process studies due to the relationship between convective storms
and severe weather phenomena. This paper generates a novel
methodology to determine convective initiation (CI) signatures
associated with extreme convective systems, including extreme
events. Based on the well-established area-overlapping technique,
an adaptive brightness temperature threshold for identification
and backward tracking with infrared data is introduced in order to
better identify areas of deep convection associated with and
embedded within larger cloud clusters. This is particularly
important over SESA because ground-based weather radar
observations are currently limited to particular areas. Extreme
rain precipitation features (ERPFs) from Tropical Rainfall
Measurement Mission are examined to quantify the full
satellite-observed life cycle of extreme convective events,
although this technique allows examination of other intense
convection proxies such as the identification of overshooting
tops. CI annual and diurnal cycles are analyzed and distinctive
behaviors are observed for different regions over SESA. It is
found that near principal mountain barriers, a bimodal diurnal CI
distribution is observed denoting the existence of multiple CI
triggers, while convective initiation over flat terrain has a
maximum frequency in the afternoon.",
doi = "10.3390/rs12020337",
url = "http://dx.doi.org/10.3390/rs12020337",
issn = "2072-4292",
language = "en",
targetfile = "remotesensing-12-00337.pdf",
urlaccessdate = "21 maio 2024"
}