Subantarctic climate
A cool, windy maritime climate found on islands near the Antarctic Convergence, with small annual temperature ranges and frequent precipitation.
Antarctic Convergence: A circumpolar ocean boundary where cold Antarctic waters meet warmer subantarctic waters. Its shifting position helps define the oceanic setting of subantarctic islands.
South Georgia: A mountainous island in the South Atlantic, east of the southern tip of South America. Its glaciers, heavy precipitation, and exposed coasts exemplify subantarctic conditions.
Subantarctic tundra: A treeless ecosystem of cold, wet subantarctic islands, dominated by grasses, herbs, mosses, and peatlands. It is the characteristic land ecosystem produced by cool, windy island conditions.
Subpolar oceanic climate: A cool oceanic climate with mild winters, cool summers, and frequent precipitation at high latitudes. It overlaps with subantarctic conditions but also occurs in northern high-latitude regions.
Southern Hemisphere westerlies: Persistent midlatitude winds that blow from west to east across the Southern Hemisphere. They bring frequent storms and strong winds to exposed subantarctic islands.
Kerguelen Islands: A remote French archipelago in the southern Indian Ocean. Their cool, wet, windy weather is a classic expression of the subantarctic climate.
Peatland: A wetland where waterlogged conditions slow decomposition and allow organic matter to accumulate as peat. Cool, persistently wet conditions favor peat formation on many subantarctic islands.
Polar climate: A climate with persistently low temperatures, including tundra and ice-cap regimes. Subantarctic islands are generally milder than the ice-covered environments of the polar climate.
Southern Ocean: The ocean surrounding Antarctica, linked to the Atlantic, Indian, and Pacific oceans by the Antarctic Circumpolar Current. Its cold waters moderate temperatures and supply moisture to surrounding islands.
Crozet Islands: A French archipelago in the southern Indian Ocean between Madagascar and Antarctica. Frequent westerly storms make the islands a particularly exposed subantarctic case.