Abstract:
The split characteristics of the tropical Mesoscale Convective System (MCS)
of April 9, 2018, in northern Ghana were studied using infrasound data
measured by the mobile array (I68CI) which was deployed by Côte d’Ivoire
National Data Center (NDC) in collaboration with the Comprehensive Nuclear-
Test-Ban Treaty (CTBT). These infrasound measurements were made
during a measurement campaign from January 1st, 2018 to December 31,
2018, in northeast Cote d’Ivoire, precisely in Comoe National Park. Graphic
Progressive Multi-Channel Correlation (GPMCC) method based on a progressive
study of the correlation functions was used to analyze and visualize
data. The infrasound detection from this MCS shows clearly a division of the
MCS structure into 2 distinct subsystems under the effect of internal and external
constraints not well known but related to convection; a smaller subsystem
in the north, associated with an area of intense rainfall of about 30
mm/hour and located at 9.5˚N - 2˚E with an azimuth of 70˚ and, a large subsystem
in the south, associated with a zone of high rainfall of about 96
mm/hour and located at 8.8˚N - 1.4˚E with an azimuth of 90˚. These two
subsystems were located 200 km and 260 km from the I68CI station with
frequencies of 2.3 Hz and 1 Hz respectively. The mesoscale convective systems
in this region are moving from East to West and including several storm
cells.
