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GEOPHYSICAL RESEARCH LETTERS, VOL. 29, NO. 20, 1950, doi:10.1029/2002GL015733, 2002

Coherent sea level response to the Antarctic Oscillation

Shigeru Aoki

Center for Antarctic Environment Monitoring, National Institute of Polar Research, Tokyo, Japan


Abstract

Large-scale sea level variations around Antarctica were studied and their relationship with atmospheric variations was investigated. Tide gauge data at five coastal stations were used. Coherent sea level variations were clearly detected for all stations on intraseasonal time scales. The coherent variations had significant negative correlations with an index of the atmospheric annular mode variation (Antarctic Oscillation). Coherence was significant for periods from 10 to 100 days with negligible time lag. The negative correlation is consistent with the mechanism that a high (low) westerly anomaly leads to a stronger (weaker) northward Ekman drift and causes divergence (convergence) around Antarctica.

Published 17 October 2002.

Index Terms: 4556 Oceanography: Physical: Sea level variations; 4207 Oceanography: General: Arctic and Antarctic oceanography; 4504 Oceanography: Physical: Air/sea interactions (0312); 4279 Oceanography: General: Upwelling and convergences.

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Citation: Aoki, S. (2002), Coherent sea level response to the Antarctic Oscillation, Geophys. Res. Lett., 29(20), 1950, doi:10.1029/2002GL015733.