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Datei:ISS-30 Lake Fitri, Chad.jpg

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Beschreibung

Beschreibung
English: Lake Fitri, Chad is featured in this image photographed by an Expedition 30 crew member on the International Space Station.
  • Lake Fitri is an endorheic, or terminal lake in a desert basin in the southern Sahara Desert. Muddy yellow-brown water marks the center of the depression (center), with a ring of dark brown muds and burnt vegetation on the exposed lake floor to the north. The lake shoreline supports a thin line of reed and floating grass vegetation which appears as dark green in the image. Deserts have so little rainfall that many rivers cannot reach the sea, but end at local low points where they form lakes. Here the usually dry Wadi Batha empties into Lake Fitri. Over time, water flow in Wadi Batha has created a large delta, which occupies the entire top left third of the image—a sense of scale is given by the 23--kilometer length of the lake. The lake has been designated under the Ramsar Convention as a wetland of international importance.
  • Other features visible in the image reveal evidence of significant climate change. The dry part of the present lake shows that the lake has been larger in the last several decades. But, as NASA scientists point out, the lake was once many times larger than its present surface area, as shown by numerous sweeping curves of ancient beaches which are now situated many kilometers from the present shoreline, at higher altitudes (upper right). Inland lakes are highly sensitive to the exact equilibrium between the amount of inflow from contributing rivers like Wadi Batha and evaporation. Each beach ridge therefore shows a different lake level and thus a different balance in the lake-river-climate system.
  • A smaller river enters from the south (top right) and cuts through the beach reaches on its way to the lake. The irregular, elongated, tan patches to the west of the lake are linear dunes aligned parallel to the dominant winds which blow from the northeast. The dunes have all formed on the downwind side (southwest) side of the lake since the lake bed and delta provide the sands which have built the dunes. The dunes indicate that during past climatic phases the lake has been almost or completely dry on repeated occasions—often enough for these great dunes, many kilometers long and several meters high, to form even in the lowest parts of the lake.
  • The islands visible in the center of the lake are likewise remnants of dunes. These dunes are smaller than those on the lake margin, presumably because waves from the lake have eroded them. Villages occupy the points of some major dunes, and some islands, where fishermen can gain easy access to the lake.
Datum
Quelle http://spaceflight.nasa.gov/gallery/images/station/crew-30/html/iss030e059398.html
Urheber NASA
Diese Mediendatei wurde vom Johnson Space Center der US-amerikanischen National Aeronautics and Space Administration (NASA) unter der Datei-ID ISS030-E-059398 kategorisiert.

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Diese Datei ist gemeinfrei (public domain), da sie vom Image Science & Analysis Laboratory der NASA erstellt worden ist. Die NASA-Urheberrechtsrichtlinie besagt, dass „NASA-Material nicht durch Urheberrecht geschützt ist, wenn es nicht anders angegeben ist“ (NASA-Urheberrechtsrichtlinien-Seite oder Nutzungsbedingungen für Fotos von Astronauten). Die Aufnahme ist Teil der Reihe The Gateway to Astronaut Photography of Earth. Bildquelle: ISS030-E-59398.

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aktuell22:00, 20. Apr. 2016Vorschaubild der Version vom 22:00, 20. Apr. 20164.288 × 2.848 (6,37 MB)Ras67new rendered in high quality from NASA's raw image data
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19:59, 21. Feb. 2012Vorschaubild der Version vom 19:59, 21. Feb. 20124.288 × 2.848 (1,76 MB)Ras67{{Information |Description ={{en|1=Lake Fitri, Chad is featured in this image photographed by an Expedition 30 crew member on the International Space Station. Lake Fitri is an endorheic, or terminal lake in a desert basin in the southern Sahara Desert.

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