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001     911849
005     20240712100847.0
024 7 _ |a 10.5194/acp-22-14957-2022
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037 _ _ |a FZJ-2022-05097
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100 1 _ |a Legras, Bernard
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245 _ _ |a The evolution and dynamics of the Hunga Tonga–Hunga Ha'apai sulfate aerosol plume in the stratosphere
260 _ _ |a Katlenburg-Lindau
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520 _ _ |a We use a combination of spaceborne instruments to study the unprecedented stratospheric plume after the Tonga eruption of 15 January 2022. The aerosol plume was initially formed of two clouds at 30 and 28 km, mostly composed of submicron-sized sulfate particles, without ash, which is washed out within the first day following the eruption. The large amount of injected water vapour led to a fast conversion of SO2 to sulfate aerosols and induced a descent of the plume to 24–26 km over the first 3 weeks by radiative cooling. Whereas SO2 returned to background levels by the end of January, volcanic sulfates and water still persisted after 6 months, mainly confined between 35∘ S and 20∘ N until June due to the zonal symmetry of the summer stratospheric circulation at 22–26 km. Sulfate particles, undergoing hygroscopic growth and coagulation, sediment and gradually separate from the moisture anomaly entrained in the ascending branch Brewer–Dobson circulation. Sulfate aerosol optical depths derived from the IASI (Infrared Atmospheric Sounding Interferometer) infrared sounder show that during the first 2 months, the aerosol plume was not simply diluted and dispersed passively but rather organized in concentrated patches. Space-borne lidar winds suggest that those structures, generated by shear-induced instabilities, are associated with vorticity anomalies that may have enhanced the duration and impact of the plume.
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700 1 _ |a Duchamp, Clair
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700 1 _ |a Sellitto, Pasquale
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700 1 _ |a Podglajen, Aurélien
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700 1 _ |a Carboni, Elisa
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700 1 _ |a Siddans, Richard
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700 1 _ |a Grooß, Jens-Uwe
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700 1 _ |a Khaykin, Sergey
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700 1 _ |a Ploeger, Felix
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773 _ _ |a 10.5194/acp-22-14957-2022
|g Vol. 22, no. 22, p. 14957 - 14970
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|t Atmospheric chemistry and physics
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856 4 _ |u https://juser.fz-juelich.de/record/911849/files/acp-22-14957-2022.pdf
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