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    WMO: The pressure wave generated by the volcanic eruption in Tonga

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    • Gkikas LGPZ
      Gkikas LGPZ Moderator last edited by Gkikas LGPZ


      https://www3.nhk.or.jp/nhkworld/en/news/20220116_36/
      "... These facts are reminders that we all share the same atmosphere, all around the globe.".

      Pressure change in my hometown because of the shock wave
      in the atmosphere!

      ab23171a-9a97-4acb-a377-9a2acb27bf3d-εικόνα.png

      idefix37 1 Reply Last reply Reply Quote 7
      • idefix37
        idefix37 Sailor Moderator @Gkikas LGPZ last edited by idefix37

        @gkikas-lgpz
        Very impressive ! It has been noted in my country too in several wx stations. I was not aware this phenomena would be possible at the opposite position on the globe of the volcanic eruption.

        Gkikas LGPZ 1 Reply Last reply Reply Quote 2
        • Gkikas LGPZ
          Gkikas LGPZ Moderator @idefix37 last edited by Gkikas LGPZ

          @idefix37
          If "the flap of a butterfly’s wings in Brazil set off a tornado in Texas"
          we must expect low predictability by wx. models into next days :)
          We'll see!

          Gkikas LGPZ 1 Reply Last reply Reply Quote 1
          • Gkikas LGPZ
            Gkikas LGPZ Moderator @Gkikas LGPZ last edited by Gkikas LGPZ

            @gkikas-lgpz
            The Volcanic eruption has brought a lot of sulfur dioxide into the atmosphere.
            fc6cccb4-a664-4b12-8849-c90c97f15ee0-εικόνα.png

            idefix37 1 Reply Last reply Reply Quote 3
            • idefix37
              idefix37 Sailor Moderator @Gkikas LGPZ last edited by idefix37

              @gkikas-lgpz

              The very rapid change in pressure probably propagated through the atmosphere like a wave.
              But it is strange to see on your SO2 map wave circles like those that appear when you throw a pebble in the water.

              Gkikas LGPZ 1 Reply Last reply Reply Quote 0
              • Gkikas LGPZ
                Gkikas LGPZ Moderator @idefix37 last edited by

                @idefix37
                A pebble in the water, produces transverse waves,
                with the surface going up and down.
                Pressure waves from the volcanic eruption are longitudinal waves
                (like those of sound) and are consisting of alternating compressions and rarefactions in a medium (air).
                Seems that compressions correspond to high SO2 density.

                idefix37 1 Reply Last reply Reply Quote 1
                • idefix37
                  idefix37 Sailor Moderator @Gkikas LGPZ last edited by idefix37

                  @gkikas-lgpz
                  You are absolutely right. I used the image of a pebble in the water, just to evoke the possible vibratory cause of the typical drawing shown in the SO2 map.

                  1 Reply Last reply Reply Quote 0
                  • idefix37
                    idefix37 Sailor Moderator last edited by idefix37

                    @Gkikas-LGPZ
                    Beautiful imagery gathered on the Eumetsat website, specially that showing the shockwaves
                    https://www.eumetsat.int/hunga-tonga-hunga-haapai_2022
                    And here a very interesting article:
                    https://eos.org/articles/the-surprising-reach-of-tongas-giant-atmospheric-waves

                    Yves70 1 Reply Last reply Reply Quote 4
                    • Yves70
                      Yves70 Meteorologist @idefix37 | Premium last edited by

                      @idefix37
                      Thanks for sharing this info with us !

                      1 Reply Last reply Reply Quote 0
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