Wissenschaftsecho » Sahelstaub – Nature-Studie belegt menschlichen Einfluss

Sahelstaub – Nature-Studie belegt menschlichen Einfluss

S P E R R F R I S T: 7. Juli 20 Uhr MESZ

Staub über dem Sahel

Schätzungsweise eine Milliarde Tonnen Staub werden jährlich in der Sahara und der südlich angrenzenden Sahelzone aufgewirbelt und u.a. mit den Passatwinden Richtung Atlantik transportiert. Seit mehr als 200 Jahren beeinflusst der Mensch diesen Prozess nachhaltig. Das belegt erstmals eine Studie, die MARUM-Wissenschaftler Dr. Stefan Mulitza und Kollegen am 8. Juli 2010 in der Fachzeitschrift Nature veröffentlichen. Demnach trug der exportorientierte, kommerzielle Ackerbau im Lauf der Kolonisierung der schwarzafrikanischen Staaten zur Verwüstung des Sahel und zur erhöhten Bodenerosion bei.
Quelle: Pressemitteilungen – idw – Informationsdienst Wissenschaft

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Opportunity's Selfie

NASA's Mars Rover Opportunity catches its own late-afternoon shadow in this dramatically lit view eastward across Endeavour Crater on Mars. The rover used the panoramic camera (Pancam) between about 4:30 and 5:00 p.m. local Mars time to record images taken through different filters and combined into this mosaic view. Most of the component images were recorded during the 2,888th Martian day, or sol, of Opportunity's work on Mars (March 9, 2012). At that time, Opportunity was spending low-solar-energy weeks of the Martian winter at the Greeley Haven outcrop on the Cape York segment of Endeavour's western rim. In order to give the mosaic a rectangular aspect, some small parts of the edges of the mosaic and sky were filled in with parts of an image acquired earlier as part of a 360-degree panorama from the same location. Opportunity has been studying the western rim of Endeavour Crater since arriving there in August 2011. This crater spans 14 miles (22 kilometers) in diameter, or about the same area as the city of Seattle. This is more than 20 times wider than Victoria Crater, the largest impact crater that Opportunity had previously examined. The interior basin of Endeavour is in the upper half of this view. The mosaic combines about a dozen images taken through Pancam filters centered on wavelengths of 753 nanometers (near infrared), 535 nanometers (green) and 432 nanometers (violet). The view is presented in false color to make some differences between materials easier to see, such as the dark sandy ripples and dunes on the crater's distant floor. Image credit: NASA/JPL-Caltech/Cornell/Arizona State Univ.
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