File:Hydrogen Sulfide Emissions off of Africa - NASA Earth Observatory.jpg
Hydrogen_Sulfide_Emissions_off_of_Africa_-_NASA_Earth_Observatory.jpg (720 × 480 pixels, file size: 82 KB, MIME type: image/jpeg)
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Afrikaans: Vir die beeld in volle resolusie of ander lêers, gaan na: earthobservatory.nasa.gov/IOTD/view.php?id=77287&src=...
Aan die einde van Februarie 2012 was daar liggroen patrone in die kuswaters van Namibië. Maar anders as ander helder skakerings wat by geleëntheid in die see verskyn, het hierdie kleure nie uit 'n opbloei van fitoplankton voortgespruit nie. Wetenskaplikes weet lankal dat waterstofsulfiedgas periodiek aan die Namibiese kus vrygestel word. Oseaanstrome dra suurstofarm water na die streek, en chemiese en biologiese prosesse kan die beperkte suurstofvoorraad uitput. Die sedimente van die plaaslike seebodem is ook ryk aan organiese materiaal soos dooie fitoplankton. Dit kan waterstofsulfied vrystel tydens hul verval in die suurstofarm omgewing. Reeds voor die satelliet-era was plaaslike inwoners van die waterstofsulfiedvrystellings bewus weens die deurdringende vroteierreuk. Satelliete se “oë in die lug” het egter onthul hoe groot en langdurig hierdie emissie-episodes kan wees. Die sg. MODIS of Matige Resolusie Afbeelding-spektroradiometer op NASA se Terra-satelliet het hierdie beeld op 29 Februarie 2012 in natuurlike kleur vasgelê. Die werwelstroom van bleek oppervlakwaters strek sowat 150 kilometer (90 myl) ver met die Namibwoestyn se kuslyn langs. Die melkgroen kleure langs die kuslyn is die resultaat van hoë swael- en lae suurstofkonsentrasies. Episodes soos hierdie is nie net kleurryk nie, maar eintlik giftig vir plaaslike mariene organismes. Visse vrek in die lae-suurstofwater; wat egter dodelik vir die visse is, kan goed wees vir voëls wat hul karkasse vreet. Net so kan kreef wat strandop kruip om van die giftige seewater te ontkom, maaltye vir plaaslike inwoners word. En sommige foraminifera, d.i. geskulpte, enkelsellige mariene protiste, floreer tewens in die suurstofarm bodemsedimente aan die Namibiese kus. Die NASA-beeld word met vergunning Jeff Schmaltz, LANCE/EOSDIS MODIS se Vinnige Reaksiespan te NASA GSFC vrygestel, en die beskrywing is deur Michon Scott saamgestel. Die Aardsterrewag se doelwit is om die beelde, stories en ontdekkings oor klimaat en die omgewing wat uit NASA-navorsing voortspruit, insluitend NASA-satellietsendings, navorsing in die veld en klimaatmodelle, met die publiek te deel.English: To download the full resolution and other files go to: earthobservatory.nasa.gov/IOTD/view.php?id=77287&src=...
Pale green patterns tinted the water along the Namibian coast in late February 2012. But unlike other bright hues that occasionally show up in the ocean, these colors didn’t result from a phytoplankton bloom. Scientists have long known that hydrogen sulfide gas is emitted periodically along the Namibian coast. Ocean currents carry oxygen-poor water to the region, and chemical and biological processes can deplete what little oxygen is available. The sediments in the local seafloor are also rich with organic matter. When organic matter decays in an oxygen-poor environment, hydrogen sulfide emissions can result. Before the satellite era, residents of the region could detect the hydrogen sulfide emissions thanks to the pervasive rotten-egg smell. But satellites’ “eyes in the sky” have shown just how big and long-lasting the emission events can be. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image on February 29, 2012. The pale-hued surface waters snake along the shore of the Namib Desert, stretching roughly 150 kilometers (90 miles). The milky-green colors along Namibia’s coast indicate high concentrations of sulfur and low concentrations of oxygen. Episodes like this aren’t just colorful, they are actually toxic to local marine organisms. Fish die in the low-oxygen water; however, what is deadly for the fish can be good for birds that feed on their carcasses. Likewise, lobsters crawling onto shore to escape the toxic seawater can make meals for locals. And some species of foraminifera—tiny shelled marine organisms—actually thrive in the oxygen-poor sea floor sediments off the Namibian coast. NASA image courtesy Jeff Schmaltz, LANCE/EOSDIS MODIS Rapid Response Team at NASA GSFC. Caption by Michon Scott. The Earth Observatory's mission is to share with the public the images, stories, and discoveries about climate and the environment that emerge from NASA research, including its satellite missions, in-the-field research, and climate models. Like us on Facebook Follow us on Twitter Add us to your circles on Google+ |
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| Source | Hydrogen Sulfide Emissions off of Africa |
| Author | NASA's Earth Observatory |
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This image was originally posted to Flickr by NASA Earth Observatory at https://www.flickr.com/photos/68824346@N02/6806465522. It was reviewed on 2 July 2012 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:08, 2 July 2012 | | 720 × 480 (82 KB) | Dzlinker | == {{int:filedesc}} == {{Information |Description=To download the full resolution and other files go to: [http://earthobservatory.nasa.gov/IOTD/view.php?id=77287&src=flickr earthobservatory.nasa.gov/IOTD/view.php?id=77287&src=...] Pale green patterns ... |
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