Answer:
The Antarctic Convergence, also known as the Antarctic Polar Front , is a marine belt that encircles Antarctica where cold, northward-flowing Antarctic waters meet the relatively warmer waters of the subantarctic. This boundary line is a natural boundary that separates two hydrological regions, distinctive marine life, and climates. The convergence is approximately 30-50 kilometers wide, and it completely encircles the southern continent roughly at a latitude of 55 degrees south , but its latitude can vary seasonally and in different longitudes across the Atlantic, Pacific, and Indian oceans between the 48th and 61st parallels of south latitude.
Within the Antarctic Convergence, Antarctic waters predominantly sink beneath the warmer subantarctic waters, while associated zones of mixing and upwelling create a zone very high in marine productivity, especially for krill. North of the convergence at approximately 60°S latitude, there are subantarctic islands, such as Amsterdam and Crozet Islands, and south of the convergence, there are Antarctic Treaty System islands, including Balleny Islands and South Shetland Islands. The convergence represents an important climatic boundary between air and water masses and is also an approximate boundary for the Southern Ocean . The Arctic has no similar boundary because of the large bodies of land contiguous with the northern polar region. The Antarctic Convergence was first crossed by Anthony de la Roché in 1675 and described by Edmond Halley in 1700.
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