ISS018-E-18110 Click the photo number to access all resolutions available and the database record.
Weather conditions on the Kerguélen Islands are typical for the latitude; at 49 degrees South, the islands sit at the crossroads of the latitude zones referred to as the “roaring forties” and the “furious fifties.” This astronaut photograph was captured on January 6, 2009—early summer in the Southern Hemisphere. That day, the mean daily temperature was 4.5 degrees Celsius (40.1 degrees Fahrenheit), with mean westerly winds of 9 meters per second (about 20 miles per hour).
The coastlines of many sub-Antarctic islands, like the Kerguélen Islands, are occupied by highly productive giant kelp beds (Macrocystis pyrifera). One of the largest marine macroalgaes (seaweeds), the species can grow to lengths of 50 meters (164 feet), forming undersea forests in hard-bottom, subtidal areas (nearshore areas that remain underwater at low tide). Fronds can spread out to form a canopy that totally covers the water surface; we interpret the black patches surrounding coastal areas in this astronaut photograph as offshore kelp beds. These kelp forests are habitat for marine animals, and due to their large biomass and relatively long survival, they are an efficient sink (storage location) for atmospheric carbon dioxide.
The surface wave pattern that travels southeastward along the gray-blue ocean surface and through the kelp beds is visible due to sunglint, the mirror-like reflection of sunlight off the water. The sunglint also improves the identification of the kelp beds by creating a different water texture (and therefore a contrast) between the dark vegetation and the reflective ocean surface.
Kerguélen Archipelago hosts thousands of marine birds (penguins, albatrosses, and petrels among others) and seals (elephant and Antarctic fur species). Whales (humpback) and dolphins (killer whales and Commerson’s dolphin) are very common in the area. Fishing boats also frequent the Archipelago—including unlicensed, so-called “pirate,” fishing vessels.
