Lêer:Namibia AMO 2005221 lrg.jpg
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Afrikaans: Die sigbare manifestasie van fitoplankton en waterstofsulfied aflandig van die Namibiese kuslyn – briljante groen kleure in die koue waters van die Suid-Atlantiese Oseaan getuig van 'n welige opbloei van seeplante en 'n waterstofsulfieduitbarsting. Soos neontekens teen 'n swart naghemel, vorm dit briljante groen strepe aan die seeoppervlak. Alhoewel die twee kleurspatsels deur verskillende dinge veroorsaak word, het hulle tog 'n gemeensame oorsaak.
Aan die linkerkant word die groen wolk deur miljoene mikroskopiese plante gevorm wat aan die seeoppervlak gedy. In hierdie deel van die Suid-Atlantiese Oseaan wel diep, koue seewater teen die kus van Afrika op. Die koue water bring voedingstowwe uit die seedieptes na die oppervlak, wat sodoende die voedingsbron van 'n florerende mariene ekosisteem word. Onder die lewe wat hierdeur gevoed word tel fitoplankton, die mikroskopiese seeplante wat die waters aan die linkerkant van die beeld verkleur. Die voedingstowwe is genoegsaam ryk dat digte opbloeisels van fitoplankton met reëlmaat langs die suidwestelike kus van Afrika vorm. Namate die plante afsterwe, sink hulle na die seebodem. Daar verteer bakterieë die plante en verbruik al die suurstof in die water. Anaërobiese bakterieë wat nie suurstof benodig nie, neem die afbreekproses oor en stel waterstofsulfiedgas vry namate hulle die dooie fitoplankton verteer. Die opbouende gas bars eindelik aan die oppervlak uit. Op pad boontoe tree dit in wisselwerking met suurstof in die boonste lae van die see en stel suiwer swael vry, 'n poeieragtige geel vastestof. Die geel swael gee aan die kuswaters 'n kenmerkende groen tint. Die uitbarstings gaan met 'n sterk swaelreuk soos verrottende eiers gepaard, en maak vis dood. Die sg. MODIS of Matige Resolusie Afbeelding-spektroradiometer aan boord van NASA se Aqua-satelliet, het hierdie beeld op 9 Augustus 2005 vasgevang.English: Phytoplankton and Hydrogen Sulfide off the Coast of Namibia: Brilliant green colors in the waters of the South Atlantic off the coast of Namibia mark out a large bloom of ocean plants and a hydrogen sulfide eruption.
Like neon signs against a black night sky, phytoplankton and hydrogen sulfide form brilliant green streaks in the ocean water off the coast of Namibia in southern Africa. Though the two splashes of color are caused by different things, they are connected. On the left, the cloud of green is formed by millions of microscopic plants growing on the surface of the ocean. In this part of the South Atlantic, deep, cold ocean water hits the coast of Africa and pushes to the surface. The cold water brings nutrients up from the ocean’s depths, and this feeds a thriving marine ecosystem. Among the life nourished here is phytoplankton, the microscopic ocean plants that color the water on the left side of this image. Nutrients are so rich that dense blooms of phytoplankton often form off the southwest coast of Africa. As the plants die, they sink to the ocean floor. There, bacteria consume the plants, using up all of the oxygen in the water. Anaerobic bacteria that don’t require oxygen take over the decay process, releasing hydrogen sulfide gas as they work on the phytoplankton. The gas accumulates until it erupts to the surface. On its way up, it interacts with oxygen in the upper layers of the ocean and releases pure sulfur, a powdery yellow solid. The yellow sulfur gives the water near the shore its distinctive green tint. The eruptions are accompanied by a strong smell—sulfur smells like rotting eggs—and fish kills. The Moderate Resolution Imaging Spectroradiometer (MODIS) flying on NASA’s Aqua satellite captured this image on August 9, 2005. |
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| Bron | http://visibleearth.nasa.gov/view_rec.php?id=20164 |
| Outeur | Credit NASA image courtesy Jeff Schmaltz, MODIS Land Rapid Response Team at NASA GSFC |
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NASA Terms of Use For all non-private uses, NASA's Terms Of Use are as follows: The imagery is free of licensing fees NASA requires that they be provided a credit as the owners of the imagery Visible Earth Addendum Beyond the NASA Terms, the Visible Earth team requests, but does not require: The Visible Earth be provided a credit as the location that the imagery was found at A URL be provided, either to the Visible Earth (http://visibleearth.nasa.gov/) or to the page providing the link to the used image. |
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| Datum/Tyd | Duimnael | Dimensies | Gebruiker | Opmerking | |
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| huidig | 14:12, 27 Mei 2007 | | 1 800 × 1 400 (180 KG) | Foundert~commonswiki | {{Information |Description=Phytoplankton and Hydrogen Sulfide off the Coast of Namibia: Brilliant green colors in the waters of the South Atlantic off the coast of Namibia mark out a large bloom of ocean plants and a hydrogen sulfide eruption. Like neon |
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