Circumpolar response of Southern Ocean eddy activity to a change in the Southern Annular Mode

Details Circumpolar response of Southern Ocean eddy activity to a change in the Southern Annular Mode Circumpolar response of Southern Ocean eddy activity to a change in the Southern Annular Mode

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316608m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 16, CiteID L16608

Physics

40

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Oceanography: General: Arctic And Antarctic Oceanography (9310, 9315), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: Physical: Eddies And Mesoscale Processes, Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504)

Scientific paper

Analysis of satellite altimeter data reveals anomalously high Eddy Kinetic Energy (EKE) in the Antarctic Circumpolar Current (ACC) during the period 2000-2002. Around 2-3 years earlier (1998), the circumpolar eastward wind stress (as quantified by the Southern Annular Mode; SAM) showed a significant positive peak, and we have shown previously that the ACC peaked around 1998 in response. An eddy-resolving ocean model is used to investigate the delay between wind forcing and the eddy response, and demonstrates that the lag is due to the time taken to influence the deep circulation of the ACC. Winds over the Southern Ocean have shown a strong climatic increase over the past few decades. If this increase in winds is also reflected as an increase in eddy activity (as our analysis suggests it might), then the increased poleward heat flux may have played a significant role in the observed warming of the Southern Ocean.

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