Articles | Volume 18, issue 9
Research article
14 May 2018
Research article |  | 14 May 2018

A new index for the wintertime southern hemispheric split jet

Stella Babian, Jens Grieger, and Ulrich Cubasch


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Short summary
One of the most prominent asymmetric features of the southern hemispheric (SH) circulation is the split jet over Australia and New Zealand in austral winter. We propose a new, hemispherical index that is based on the principal components (PCs) of the zonal wind field for the SH winter. The new PC-based index (PSI) suggests that the SH split jet is strongly associated with the AAO. Furthermore, both flavors of ENSO and the PSA-1 pattern produce favorable conditions for a SH split event.
Final-revised paper