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Signature of intraseasonal oscillations during Hunga Tonga volcanic eruption.

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Title: Signature of intraseasonal oscillations during Hunga Tonga volcanic eruption.
Authors: Chaurasia, A.1,2 (AUTHOR) ankitac@prl.res.in, Guharay, A.1 (AUTHOR) guharay@prl.res.in
Source: Advances in Space Research. Mar2026, Vol. 77 Issue 5, p5546-5557. 12p.
Subjects: Hunga Tonga-Hunga Ha'apai Eruption & Tsunami, 2022, Atmospheric waves, Atmospheric tides, Atmospheric radiation, Humidity, Madden-Julian oscillation, Precipitation variability, Wavelets (Mathematics)
Abstract: The Hunga Tonga–Hunga Ha'apai (HTHH) volcanic (20.536°S, 175.382°W) eruption, took place on 15 January 2022, is one of the most powerful events ever recorded, generating a broad spectrum of atmospheric disturbances. The present study investigates the eruption impact on the Intraseasonal Oscillations (ISO) using satellite and reanalysis data. Wavelet analysis of Outgoing Longwave Radiation (OLR), Precipitation amount (RF), and Specific Humidity (SH) at the volcano location reveals enhanced intraseasonal variability in the period range 20–40 days. Estimated phase speeds obtained from the filtered profiles are found to be 3.6 m/s (OLR), 2.8 m/s (RF), and 3.7 m/s (SH) with eastward propagation direction. Despite strong ISO signature in OLR, RF, and SH, the zonal wind (U) shows no evident response to the event, indicating a possible decoupling of convection and wind. Investigation of the Solar F10.7 flux around the eruption time suggests no clear impact of the solar variability on the observed 20–40 day oscillations. An appreciable signature of the intra-seasonal period is observed in the DE3 (eastward-propagating diurnal tide with zonal wavenumber 3) amplitude in the lower stratosphere, indicating that the event influenced local convective activity and associated wave. Our present findings provide a novel perspective on how extreme volcanic events can impact the atmospheric wave dynamics of varying periods, offering valuable insights into atmospheric response to such powerful event. [ABSTRACT FROM AUTHOR]
Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Signature of intraseasonal oscillations during Hunga Tonga volcanic eruption.
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  Data: <searchLink fieldCode="DE" term="%22Hunga+Tonga-Hunga+Ha'apai+Eruption+%26+Tsunami%2C+2022%22">Hunga Tonga-Hunga Ha'apai Eruption & Tsunami, 2022</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+waves%22">Atmospheric waves</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+tides%22">Atmospheric tides</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+radiation%22">Atmospheric radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Humidity%22">Humidity</searchLink><br /><searchLink fieldCode="DE" term="%22Madden-Julian+oscillation%22">Madden-Julian oscillation</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+variability%22">Precipitation variability</searchLink><br /><searchLink fieldCode="DE" term="%22Wavelets+%28Mathematics%29%22">Wavelets (Mathematics)</searchLink>
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  Data: The Hunga Tonga–Hunga Ha'apai (HTHH) volcanic (20.536°S, 175.382°W) eruption, took place on 15 January 2022, is one of the most powerful events ever recorded, generating a broad spectrum of atmospheric disturbances. The present study investigates the eruption impact on the Intraseasonal Oscillations (ISO) using satellite and reanalysis data. Wavelet analysis of Outgoing Longwave Radiation (OLR), Precipitation amount (RF), and Specific Humidity (SH) at the volcano location reveals enhanced intraseasonal variability in the period range 20–40 days. Estimated phase speeds obtained from the filtered profiles are found to be 3.6 m/s (OLR), 2.8 m/s (RF), and 3.7 m/s (SH) with eastward propagation direction. Despite strong ISO signature in OLR, RF, and SH, the zonal wind (U) shows no evident response to the event, indicating a possible decoupling of convection and wind. Investigation of the Solar F10.7 flux around the eruption time suggests no clear impact of the solar variability on the observed 20–40 day oscillations. An appreciable signature of the intra-seasonal period is observed in the DE3 (eastward-propagating diurnal tide with zonal wavenumber 3) amplitude in the lower stratosphere, indicating that the event influenced local convective activity and associated wave. Our present findings provide a novel perspective on how extreme volcanic events can impact the atmospheric wave dynamics of varying periods, offering valuable insights into atmospheric response to such powerful event. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.asr.2025.12.072
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 5546
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      – SubjectFull: Hunga Tonga-Hunga Ha'apai Eruption & Tsunami, 2022
        Type: general
      – SubjectFull: Atmospheric waves
        Type: general
      – SubjectFull: Atmospheric tides
        Type: general
      – SubjectFull: Atmospheric radiation
        Type: general
      – SubjectFull: Humidity
        Type: general
      – SubjectFull: Madden-Julian oscillation
        Type: general
      – SubjectFull: Precipitation variability
        Type: general
      – SubjectFull: Wavelets (Mathematics)
        Type: general
    Titles:
      – TitleFull: Signature of intraseasonal oscillations during Hunga Tonga volcanic eruption.
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            NameFull: Chaurasia, A.
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            NameFull: Guharay, A.
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            – D: 01
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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