A new analysis of Africas past and future climate shows that the Sahel region, which experienced catastrophic drought until rains returned in the 1990s, could experience wetter monsoons for decades to come. However, drought across southern Africa is projected to intensify further. Oceanic warming consistent with an increase in greenhouse gases appears to be a factor in these expected 21st-century changes to Africas monsoons.
James Hurrell of the National Center for Atmospheric Research (NCAR) will present the findings on May 24 in New Orleans at the spring meeting of the American Geophysical Union. The study, conducted with Martin Hoerling (National Oceanic and Atmospheric Administration), was supported by NOAA and the National Science Foundation, NCARs primary sponsor.
The analysis, which draws on 60 simulations of global climate from five computer models, provides new evidence linking drought in southern Africa to the warming of the Indian Ocean. However, it contradicts earlier studies that also connected the Sahelian drought of northern Africa to the Indian Ocean. Instead, the new results point to a late 20th-century cooling of the North Atlantic Ocean as having been key to Sahelian drought. A subsequent switch to North Atlantic warming, partly consistent with the impact of greenhouse gas increases, is the main factor behind the Sahels recent swing from drought to moist conditions, the researchers believe.
Anatta | EurekAlert!
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Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
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The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
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The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
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