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  Image: Geographic Location Direction Photo #: ISS018-E-18110 Date: Jan. 2009
Geographic Region: KERGUELEN ILES
Feature: S. HOWE I., RHODES B., I., PEN.

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  Kerguelen Kelp Beds, Southern Indian Ocean

Mac Murdo and Howe Islands are 2 of the 300 islands of the remote Kerguélen Archipelago, located in the southern Indian Ocean. The islands are part of a larger island group called the French Southern and Antarctic Lands. The Kerguelen Archipelago is also called the “Desolation Islands.” The coastal regions of the islands support low-growing vegetation (mainly the genus Acaena), while elevations above 50 meters are bare rock. There are no permanent (human) residents on the islands, but a permanent settlement (Port aux Français) hosts visiting biologists, oceanographers, and other Earth scientists. In addition, the settlement maintains a weather station and a satellite/rocket tracking station.

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.
 
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Images: All Available Images Low-Resolution 263k
Mission: ISS018  
Roll - Frame: E - 18110
Geographical Name: KERGUELEN ILES  
Features: S. HOWE I., RHODES B., I., PEN.  
Center Lat x Lon: 48.9S x 69.4E
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
 
Camera: N2
 
Camera Tilt: 19   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 800  
 
Nadir to Photo Center Direction: NE   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number: 2049  
 
Date: 20090106   YYYYMMDD
Time: 083056   GMT HHMMSS
Nadir Lat: 49.4S  
Latitude of suborbital point of spacecraft
Nadir Lon: 68.4E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 331   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 193   nautical miles
Sun Elevation: 61   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views:  
Water Views: OCEAN, SUNGLINT, WAVE  
Atmosphere Views:  
Man Made Views: PORT  
City Views:  
Photo is not associated with any sequences


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