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Modifications of the quasi‐biennial oscillation by a geoengineering perturbation of the stratospheric aerosol layer
Author(s) -
Aquila V.,
Garfinkel C. I.,
Newman P.A.,
Oman L.D.,
Waugh D.W.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2013gl058818
Subject(s) - stratosphere , quasi biennial oscillation , aerosol , sulfate aerosol , atmospheric sciences , equator , environmental science , climatology , longitude , geoengineering , perturbation (astronomy) , latitude , meteorology , physics , climate change , geology , geodesy , oceanography , quantum mechanics
This paper examines the impact of geoengineering via stratospheric sulfate aerosol on the quasi‐biennial oscillation (QBO) using the NASA Goddard Earth Observing System version 5 Chemistry Climate Model. We performed four 30 year simulations with a continuous injection of sulfur dioxide on the equator at 0° longitude. The four simulations differ by the amount of sulfur dioxide injected (5 Tg/yr and 2.5 Tg/yr) and the altitude of the injection (16 km–25 km and 22 km–25 km). We find that such an injection dramatically alters the quasi‐biennial oscillation, prolonging the phase of easterly shear with respect to the control simulation. This is caused by the increased aerosol heating and associated warming in the tropical lower stratosphere and higher residual vertical velocity. In the case of maximum perturbation, i.e., highest stratospheric aerosol burden, the lower tropical stratosphere is locked into a permanent westerly QBO phase.