SPARC workshop on the impact of the Hunga Tonga eruption

8:30 - 10:00 (1h30)

Effect on stratospheric cooling, dynamics and transport

Room Jean Jaurès

› Hunga eruption induced changes to the stratospheric mid-latitude and tropical circulation - Lawrence Coy, NASA Goddard Space Flight Center 08:30-08:45 (15min)

› Observed Impacts of the Hunga Eruption on Stratospheric Temperature - Matthias Stocker, Wegener Center for Climate and Global Change 08:45-09:00 (15min)

› Stratospheric impacts of the Hunga H2O and aerosol perturbations and QBO - Eric Fleming, NASA Goddard Space Flight Center, Science Systems and Applications, Inc. [Lanham] 09:00-09:15 (15min)

› Hunga Tonga impacts on atmospheric circulation and transport, and their links with ozone and surface climate - HTHH-MOC preliminary insights - Ewa Bednarz, Cooperative Institute for Research in Environmental Sciences, NOAA Chemical Sciences Laboratory 09:15-09:30 (15min)

› Disturbing the Middle Stratospheric Balance: The Enduring Impact of Hunga Tonga-Hunga Ha'apai volcanic eruption - Ghouse Basha, National Atmospheric Research Laboratory [Tirupati] 09:30-09:45 (15min)

› Long-term temperature impacts of Hunga in the stratosphere and above - William Randel, National Center for Atmospheric Research 09:45-10:00 (15min)

10:00 - 10:30 (30min)

Coffee break

10:30 - 12:00 (1h30)

Effects on ozone, OH, and stratospheric chemistry

Room Jean Jaurès

› Stratospheric chlorine processing after the unprecedented Hunga Tonga eruption - Jun Zhang, NSF National Center for Atmospheric Research - Peidong Wang, Massachusetts Institute of Technology 10:30-10:45 (15min)

› Effects ot the Hunga Tonga eruption on stratospheric chemistry in 2022 and 2023 as simulated by EMAC - Christoph Bruehl, MPI for Chemistry, Mainz 10:45-11:00 (15min)

› The Influence of Stratospheric Hydration from the Hunga Eruption on Chemical Processing in the Stratospheric Winter Polar Vortices - Michelle Santee, Jet Propulsion Laboratory 11:00-11:15 (15min)

› Impact of Hunga Tonga-Hunga Ha'apai water vapour on polar vortex dehydration and ozone depletion: Antarctic 2023 and Arctic 2024 - Xin Zhou, School of Atmospheric Sciences, Chengdu University of Information Technology, School of Earth and Environment, University of Leeds 11:15-11:30 (15min)

› Impact of the Hunga Tong-Hunga Ha'apai eruption on the Polar Stratospheric Clouds observed by the lidar observatory at Concordia station - Marcellinus Snels, Institute of Atmospheric Sciences and Climate 11:30-11:45 (15min)

› Observing and Projecting the Lasting Fate of the Hunga Eruption on Atmospheric Water Vapor and Hydroxyl Radical - Luke Oman, NASA Goddard Space Flight Center 11:45-12:00 (15min)

12:00 - 13:30 (1h30)

Lunch

13:30 - 14:00 (30min)

Effect on upper stratosphere to thermosphere and upper BDC branch

› Transport of the Hunga Tonga - Hunga Ha'apai H2O anomaly through the mesosphere – comparing observation with modeling - Sandra Wallis, University of Greifswald 13:30-13:45 (15min)

› Potential Impact of the HTHH Volcanic Eruption on Future PMCs - Wandi Yu, Lawrence Livermore National Laboratory 13:45-14:00 (15min)

14:00 - 15:00 (1h)

Radiative effects, surface cooling & fate of the stratospheric water vapour

› What is the instantaneous and adjusted radiative forcing of the Hunga eruption, and why is the Hunga eruption more effective in producing stratospheric aerosol optical depth than the volcanic injections just over the tropopause layer? - Georgiy Stenchikov, King Abdullah University of Science and Technology [Saudi Arabia] 14:00-14:15 (15min)

› Evolution of the Climate Forcing During the Two Years after the Hunga Tonga-Hunga Ha'apai Eruption - Mark Schoeberl, STC 14:15-14:30 (15min)

› The radiative impact of the 2022 Hunga Tonga-Hunga Ha'apai stratospheric eruption: a 2-year perspective - Pasquale Sellitto, Laboratoire Interuniversitaire des Systèmes Météorologiques (LISA) - IPSL 14:30-14:45 (15min)

› Radiative effect of the increase in stratospheric water vapour from the Honga-Tonga eruption - Gunnar Myhre, CICERO 14:45-15:00 (15min)

15:00 - 15:30 (30min)

Coffee break

15:30 - 17:00 (1h30)

Posters and modelling meeting

Room Jean Jaurès

19:00 - 22:00 (3h)

Dinner