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by zopeadm — last modified Jan 05, 2011 02:02 PM

Dominant propagating signals in sea level anomalies in the Southern Ocean,

Pottier C., Céron J-P., Sudre J., Dadou I., Belamari, and Garçon V.,

Geophysical Research Letters, 31, L11305, doi: 10.1029/2004GL019565.



We examine the time evolution over an 11 yr time series of the dominant modes of variability in sea level anomalies (SLA) from TOPEX/Poseidon and ERS-1/2 in the Southern Ocean (35-60°S). We use Hayashi's classical space-time spectral analysis and a newly developed method combining a Gabor analysis with Hayashi's method. Zonal wavenumbers 3 and 2 emerge unambiguously with null corresponding meridional wavenumber meaning that both associated modes have no meridional propagation. Their power spectrum density (PSD) is maximum within 50-55°S. The 3/0 mode displays a clear westward propagation associated with a 1.04 yr period. The 2/0 pair is characterized by a ~4.4 yr period and exhibits a clear eastward propagation with a maximal PSD just after the 1998 El Niño peak. Zonal wavenumber-2 mode is then probably part of the Antarctic Circumpolar Wave.



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