An oceanic frontal zone that separates the subtropical and subpolar gyres, which is both a temperature and salinity front. In the North Atlantic, where it is also known as the cold wall or North Wall, it lies between the warm and saline Gulf Stream and North Atlantic currents, and the cold, relatively fresh, Labrador Current. In the North Pacific, it is in two portions, divided by the islands of Japan. The larger frontal zone lies between the warm, saline Kuro Shio and the cold, fresh Oyashio current.
Subjects: Meteorology and Climatology.