Using the International Monitoring System infrasound network to study large-scale atmospheric waves / Julien Marty and Francis Dalaudier.

Vienna, Austria: CTBTO Preparatory Commission , 2011.

eng

The majority of the operational IMS infrasound stations use absolute pressure sensors that measure pressure fluctuations with frequencies ranging from DC to tens of Hertz. This frequency range encompasses the entire domain of infrasounds as well as that of gravity waves and meteorological processes. A recent study, which has demonstrated the accuracy of the IMS pressure measurements up to 24 hour period, has opened the way to the study of gravity waves from IMS pressure measurements. Among gravity waves, atmospheric tides are waves with periods corresponding to integral fractions of a solar day (primarily diurnal and semidiurnal). They are produced by the atmospheric solar heating combined with upward eddy conduction of heat from the ground. Their importance is high as they regularly cause oscillations in atmospheric wind, temperature and pressure fields. The seasonal variations of the diurnal (S1) and semidiurnal (S2) pressure oscillations are studied from IMS pressure measurements. The results are in good agreement with previous modelling and observations. However, strong variations in S1's amplitude - not predicted by global modelling – are also observed during short time-period on continental stations. These variations are not only detected by IMS infrasound sensors but also by the absolute pressure sensors part of IMS meteorological stations. The study of these phenomena is of high importance since it can modify atmospheric wind profiles and influence the propagation of infrasonic waves.

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1. The Earth as a Complex System: T1-P32 (2011)

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Electronic resource - Conference Proceedings - Poster Presentation