Infrasound has a long history of monitoring sudden stratospheric warmings. Several pioneering studies have focused on the various effects of a major warming on the propagation of infrasound. A clear transition has been made from observing anomalous signatures towards the use of these signals to study anomalies in upper atmospheric conditions. Typically, the infrasonic signature of a major warming corresponds to summer-like infrasound characteristics observed in midwinter. More subtile changes occur during a minor warming, recognisable by the presence of a bidirectional stratospheric duct or propagation through a warm stratosphere leading to small shadow zones. A combined analysis of all signal characteristics unravels the general stratospheric structure throughout the life cycle of the warming. A new methodology to evaluate the state of the atmosphere as represented by various weather and climate models is demonstrated. A case study comparing regional volcano infrasound with simulations using various forecast steps indicates significant differences in stratospheric forecast skill, associated with a data assimilation issue during the warming.
Original languageEnglish
Title of host publicationInfrasound Monitoring for Atmospheric Studies
EditorsA. Le Pichon, E. Blanc, A. Hauchecorne
Place of PublicationCham
Number of pages33
ISBN (Electronic)978-3-319-75140-5
ISBN (Print)978-3-319-75138-2
Publication statusPublished - 2019

ID: 57080296