TITLE:
Effects of On-Site Weather Conditions on the Detection Capability of the Infrasound Station of Madagascar I33MG
AUTHORS:
Andry Harifidy Ramanantsoa, Elisabeth Blanc, Gérard Rambolamanana, Andriniaina Tahina Rakotoarisoa, Fanomezana Randrianarinosy, Jean Bernardo Andrianaivoarisoa
KEYWORDS:
Temperature, Wind Speed, Noise Power, Detection, Infrasound
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.12 No.2,
March
22,
2022
ABSTRACT: Noise due
to surface wind and temperature is a problem in infrasound. Efficiency of IMS
network concerns scientists. It is obvious to find the causes of deficiencies
of detection of infrasound station by studying background noise power with
respect to the surface wind and the temperature. Data measured by MB2000
microbarometer of infrasound station I33MG are used for the study. Infrasound
records are separated into 4 frequency bands centered respectively at: 1 Hz, 0.25 Hz, 0.0625 Hz and
0.0156 Hz. Effects of surface wind and temperature are studied by plotting the
variations of the background noise power with respect to the temperature or
wind speed in the four considered frequency bands and compared with the median
of background noise power. The influence of temperature is manifested by a
reduction in the number of low-frequency detection. The surface wind reduces
the number of detection at a high frequency. An exponential function is proposed to predict the
variations of the noise power in different observation frequencies and
temperature and wind conditions. The views expressed herein are those of the authors and do not
necessarily reflect the views of the CTBTO Preparatory Commission.