Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach
This study investigates the use of a vespagram-based approach as a tool for multi-directional comparison between simulated microbarom soundscapes and infrasound data recorded at ground-based array stations. Data recorded at the IS37 station in northern Norway during 2014–2019 have been processed to...
Published in: | Annales Geophysicae |
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Online Access: | https://doi.org/10.5194/angeo-39-515-2021 https://angeo.copernicus.org/articles/39/515/2021/ |
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ftcopernicus:oai:publications.copernicus.org:angeo91250 2023-05-15T17:43:28+02:00 Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach Vorobeva, Ekaterina Carlo, Marine Pichon, Alexis Espy, Patrick Joseph Näsholm, Sven Peter 2021-06-11 application/pdf https://doi.org/10.5194/angeo-39-515-2021 https://angeo.copernicus.org/articles/39/515/2021/ eng eng doi:10.5194/angeo-39-515-2021 https://angeo.copernicus.org/articles/39/515/2021/ eISSN: 1432-0576 Text 2021 ftcopernicus https://doi.org/10.5194/angeo-39-515-2021 2021-06-14T16:22:13Z This study investigates the use of a vespagram-based approach as a tool for multi-directional comparison between simulated microbarom soundscapes and infrasound data recorded at ground-based array stations. Data recorded at the IS37 station in northern Norway during 2014–2019 have been processed to generate vespagrams (velocity spectral analysis) for five frequency bands between 0.1 and 0.6 Hz . The back azimuth resolution between the vespagram and the microbarom model is harmonized by smoothing the modeled soundscapes along the back azimuth axis with a kernel corresponding to the frequency-dependent array resolution. An estimate of similarity between the output of the microbarom radiation and propagation model and infrasound observations is then generated based on the image-processing approach of the mean square difference. The analysis reveals that vespagrams can monitor seasonal variations in the microbarom azimuthal distribution, amplitude, and frequency, as well as changes during sudden stratospheric warming events. The vespagram-based approach is computationally inexpensive, can uncover microbarom source variability, and has the potential for near-real-time stratospheric diagnostics and atmospheric model assessment. Text Northern Norway Copernicus Publications: E-Journals Norway Annales Geophysicae 39 3 515 531 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
This study investigates the use of a vespagram-based approach as a tool for multi-directional comparison between simulated microbarom soundscapes and infrasound data recorded at ground-based array stations. Data recorded at the IS37 station in northern Norway during 2014–2019 have been processed to generate vespagrams (velocity spectral analysis) for five frequency bands between 0.1 and 0.6 Hz . The back azimuth resolution between the vespagram and the microbarom model is harmonized by smoothing the modeled soundscapes along the back azimuth axis with a kernel corresponding to the frequency-dependent array resolution. An estimate of similarity between the output of the microbarom radiation and propagation model and infrasound observations is then generated based on the image-processing approach of the mean square difference. The analysis reveals that vespagrams can monitor seasonal variations in the microbarom azimuthal distribution, amplitude, and frequency, as well as changes during sudden stratospheric warming events. The vespagram-based approach is computationally inexpensive, can uncover microbarom source variability, and has the potential for near-real-time stratospheric diagnostics and atmospheric model assessment. |
format |
Text |
author |
Vorobeva, Ekaterina Carlo, Marine Pichon, Alexis Espy, Patrick Joseph Näsholm, Sven Peter |
spellingShingle |
Vorobeva, Ekaterina Carlo, Marine Pichon, Alexis Espy, Patrick Joseph Näsholm, Sven Peter Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
author_facet |
Vorobeva, Ekaterina Carlo, Marine Pichon, Alexis Espy, Patrick Joseph Näsholm, Sven Peter |
author_sort |
Vorobeva, Ekaterina |
title |
Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
title_short |
Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
title_full |
Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
title_fullStr |
Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
title_full_unstemmed |
Benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
title_sort |
benchmarking microbarom radiation and propagation model against infrasound recordings: a vespagram-based approach |
publishDate |
2021 |
url |
https://doi.org/10.5194/angeo-39-515-2021 https://angeo.copernicus.org/articles/39/515/2021/ |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-39-515-2021 https://angeo.copernicus.org/articles/39/515/2021/ |
op_doi |
https://doi.org/10.5194/angeo-39-515-2021 |
container_title |
Annales Geophysicae |
container_volume |
39 |
container_issue |
3 |
container_start_page |
515 |
op_container_end_page |
531 |
_version_ |
1766145558729195520 |