Ask the Times

By TIMES WIRES
Published July 19, 2007

---

What is the Antarctica Convergence? Is it a specific geographic point?

The convergence is an oceanic zone about 20 to 30 miles wide that encircles Antarctica, between the 48th and 61st parallels of the Southern Hemisphere. The location is determined by the sudden change in surface temperature of the water, which averages 5 to 10 degrees Fahrenheit, according to the U.S. Geological Survey Geographic Name Information System. When the cold, northward-flowing waters sink beneath warmer waters, the upwelling of warmer water brings nutrients to the surface and creates an environment rich in marine life.

Compiled from Times staff and wires. To submit a question, e-mail answers@tampabay.com or call 727 893-8179, toll-free 1-800-333-7505, ext. 8179.