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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Cited articles

Babian, S., Rust, H. W., Grieger, J., and Cubasch, U.: Representation of the Antarctic Oscillation and related precipitation in the MPI Earth System Model, Meteorol. Z., 17, 12635, https://doi.org/10.1127/metz/2016/0661, 2016. a
Bals-Elsholz, T. M., Atallah, E. H., Bosart, L. F., Wasula, T. A., Cempa, M. J., and Lupo, A. R.: The wintertime southern hemisphere split jet: Structure, variability, and evolution, J. Climate, 14, 4191–4215, https://doi.org/10.1175/1520-0442(2001)014<4191:TWSHSJ>2.0.CO;2, 2001. a, b, c, d, e, f, g, h, i, j, k, l, m, n, o
Bracegirdle, T. J. and Marshall, G. J.: The reliability of antarctic tropospheric pressure and temperature in the latest global reanalyses, J. Climate, 25, 7138–7146, https://doi.org/10.1175/JCLI-D-11-00685.1, 2012. a
Carvalho, L., Jones, C., and Ambrizzi, T.: Opposite phases of the Antarctic Oscillation and relationships with intraseasonal to interannual activity in the tropics during the austral summer, J. Climate, 18, 702–718, 2005. a
Chen, B., Smith, S. R., and Bromwich, D. H.: Evolution of the Tropospheric Split Jet over the South Pacific Ocean during the 1986–89 ENSO Cycle, Mon. Weather Rev., 124, 1711–1731, https://doi.org/10.1175/1520-0493(1996)124<1711:EOTTSJ>2.0.CO;2, 1996. a, b, c
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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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