Greifswald 2024 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 1: Atmospheric Trace Gases and Aerosols

UP 1.5: Vortrag

Montag, 26. Februar 2024, 12:15–12:30, ELP 6: HS 4

Tracing the Hunga Tonga - Hunga Ha’apai H₂O anomaly through the mesosphere — •Sandra Wallis and Christian von Savigny — University of Greifswald, Germany

The 2022 Hunga Tonga - Hunga Ha’apai eruption emitted an exceptionally large amount of approximately 150 Tg H₂O into the middle atmosphere (10 - 100 km). After an immediate subsidence, the volcanic H₂O anomaly began to rise in the tropics and crossed the stratopause (1 hPa) by the end of March 2023. We use MLS H₂O mixing ratios to trace its subsequent transport through the mesosphere (50 - 100 km altitude). This research is especially relevant to the noctilucent cloud community, because upon reaching the summer mesopause region (approximately 90 km) the H₂O anomaly could potentially have an impact on the properties of noctilucent clouds such as occurrence frequency or brightness.

Keywords: Hunga Tonga; water vapor; mesosphere