Abstract
In order to investigate how the Antarctic Circumpolar Current (ACC) responds to changes in wind forcing, cross coherences are calculated between Southern Ocean winds and bottom pressure measurements from either side of Drake Passage. Wind stress and wind-stress curl are derived from the European Research Satellites (ERS) scatterometers, from the Special Sensor Microwave Imager (SSMI), and from the European Centre for Medium-Range Weather Forecasts (ECMWF) forecast model. Winds and bottom pressure measurements both show substantial variability on all resolved time scales. Statistically significant coherences occur over the full range of resolved frequencies for both wind stress and wind-stress curl. The largest number of statistically coherent frequencies occur between the bottom pressure at the south side of Drake Passage and wind stress. Phases are consistent with wind slightly leading bottom pressure, and strong winds driving strong transport.
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