Articles | Volume 18, issue 9
Atmos. Chem. Phys., 18, 6749–6760, 2018
https://doi.org/10.5194/acp-18-6749-2018
Atmos. Chem. Phys., 18, 6749–6760, 2018
https://doi.org/10.5194/acp-18-6749-2018

Research article 14 May 2018

Research article | 14 May 2018

A new index for the wintertime southern hemispheric split jet

Stella Babian et al.

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Anna Wenzel on behalf of the Authors (26 Jan 2018)  Author's response
ED: Referee Nomination & Report Request started (04 Feb 2018) by Peter Haynes
RR by Anonymous Referee #2 (08 Feb 2018)
RR by Anonymous Referee #1 (19 Feb 2018)
ED: Publish subject to technical corrections (14 Mar 2018) by Peter Haynes
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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.
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