caa a22 4500 469076828 CHVBK 20180323132937.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF02511749 doi (NATIONALLICENCE)springer-10.1007/BF02511749 Pitari G. Dipartimento di Fisica dell'Università, 67010 Coppito, L'Aquila, Italia aut On the possible perturbation of stratospheric dynamics due to Pinatubo aerosols [Elektronische Daten] [G. Pitari] Summary: The injection of a large amount of SO2 in the tropical lower stratosphere following the eruption of Mt. Pinatubo (15.1oN, 120.4oE; June 15, 1991) can produce a not negligible perturbation in the stratospheric dynamics. Sulfate aerosols formed by nucleation of H2SO4 vapour, which is in turn produced from the SO2 plume, are responsible for a net heating of the order of 0.15K/day in the equatorial stratosphere, located where the thickest portion of the aerosol cloud is found. As shown by recent satellite data, this diabatic perturbation is responsible for a temperature increase of the order of (2÷3) K at 30m bar during the summer and fall of 1991, that is similar to what found for the 1982 eruption of El Chichón. In this work we use a stratospheric three-dimensional model to investigate the dynamical response of the middle atmosphere to this diabatic forcing. Few months after the eruption, change in the diabatic circulation larger than 10% is found in the lower stratosphere, along with a stronger planetary wave activity during the 1991/92 winter season. This supports some conclusions of a recent investigation by Dunkerton and Delisi on the effects of the 1982 eruption of El Chichón and is shown to have a substantial effect on trace species transport, comparable to that associated to the Quasi-Biennal Oscillation (QBO). Società Italiana di Fisica, 1992 Meteorology nationallicence Il Nuovo Cimento C Kluwer Academic Publishers 15/4(1992-07-01), 485-489 0390-5551 15:4<485 1992 15 11543 https://doi.org/10.1007/BF02511749 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02511749 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Pitari G. Dipartimento di Fisica dell'Università, 67010 Coppito, L'Aquila, Italia aut NATIONALLICENCE 773 0- Il Nuovo Cimento C Kluwer Academic Publishers 15/4(1992-07-01), 485-489 0390-5551 15:4<485 1992 15 11543 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer