Coherence of Antarctic sea levels, Southern Hemisphere Annular Mode, and flow through Drake Passage

Details Coherence of Antarctic sea levels, Southern Hemisphere Annular Mode, and flow through Drake Passage Coherence of Antarctic sea levels, Southern Hemisphere Annular Mode, and flow through Drake Passage

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30i..17h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 9, pp. 17-1, CiteID 1464, DOI 10.1029/2003GL017240

Physics

26

Oceanography: Physical: Sea Level Variations, Oceanography: Physical: Air/Sea Interactions (0312), Oceanography: General: Arctic And Antarctic Oceanography, Global Change: Climate Dynamics (3309), Oceanography: General: Numerical Modeling

Scientific paper

It is known from small sets of tide gauges that sub-surface pressure (sea level corrected for the inverse barometer effect) around Antarctica varies coherently around about half of the continent, and that this coherent signal is related to atmospheric forcing in the form of the Antarctic Oscillation, or Southern Hemisphere Annular Mode. We here confirm that this coherence extends to a more extensive network of tide gauges, and to parts of the continental shelf far from the shore, as measured by bottom pressure gauges. We use time series from an eddy-permitting ocean model with realistic forcing to relate the coherent mode to fluctuations in transport through Drake Passage, and confirm, using a 1° resolution barotropic model, that the fluctuations are predominantly due to barotropic dynamics, although baroclinic dynamics are expected to play an increasing role at interannual timescales.

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