Auxiliary material for this article contains additional information (text and two figures) on the method used for reconstructing the Quasi Biennial Oscillation.

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grl23719-sup-0001-readme.txtplain text document1Kreadme.txt
grl23719-sup-0002-txts01.txtplain text document3KText S1. Step-by-step description of the reconstruction method.
grl23719-sup-0003-fs01.epsPS document4331KFigure S1. Schematic depiction of the QBO reconstruction from ERA-40 data, historical pilot balloon data, and sea-level pressure data from Djakarta and the validation using historical total ozone data.
grl23719-sup-0004-fs02.epsPS document1288KFigure S2. Mean values, maxima, and minima of all QBO half-cycles in ERA-40 after stretching to a common length.

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