circumpolar current

[kurious]

How fast does the circumpolar current move and how much has its speed changed over the ages? Also, how deep is the current?

[Andre]

You mean the Antarctic circumpolar current? (http://oceancurrents.rsmas.miami.edu/southern/antarctic-cp.html)

The ACC extends from the sea surface to depths of 2000-4000 m and can be as wide as 2000 km

We know that all ocean currents were severely disrupted during the "Last Glacial Maximum" (LGM) somewhere between 24,000 and 15,000 years ago, including the ACC (http://www.awi-bremerhaven.de/Publications/Mac2000a_abstract.html), however the explanation for that may be surprising.