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Tree rings tell tale of megadroughts

Tree rings in ancient timber show that the Colorado Plateau experienced a 60-year drought in the 12th century.

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Keywords: tree, rings, tell, tale, megadroughts, ring, megadrought

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Similar news on "Tree rings tell tale of megadroughts":

1. Colorado River streamflow history reveals megadrought before 1490
   05-17-2007 · EurekAlert!
   An epic drought during the mid-1100s dwarfs any drought previously documented for a region that includes areas of Arizona, Colorado, New Mexico, Utah and Wyoming. The six-decade-long drought was marked by the absence of very wet years and a 25-year period when Colorado River flow averaged 15 percent below normal. The new tree-ring-based reconstruction documents the year-by-year natural variability of streamflows in the upper Colorado River basin back to A. D. 762.
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2. Tree rings show elevated tungsten coincides with Nevada leukemia cluster
   04-30-2007 · EurekAlert!
   Tungsten began increasing in trees in Fallon, Nev. several years before the town's rise in childhood leukemia cases, according to a research team led by Paul R. Sheppard of the University of Arizona's Laboratory of Tree-Ring Research. This is the first study that has examined changes in levels of heavy metals in Fallon over time.
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3. Images of Saturn's small moons tell the story of their origins
   12-07-2007 · European Space Agency (ESA)
   Imaging scientists on the Cassini mission are telling a tale of how the small moons orbiting near the outer rings of Saturn came to be. The moons began as leftover shards from larger bodies that broke apart and filled out their figures with the debris that made the rings.
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4. How does your brain tell time?
   01-31-2007 · EurekAlert!
   For decades, scientists have believed that the brain possesses an internal clock that allows it to keep track of time. Now a UCLA study in the February 1 edition of Neuron proposes a new model in which a series of physical changes to the brain's cells helps the organ to monitor the passage of time -- much like counting the rings in a tree stump reveals the age of a fallen tree.
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5. New CU-Boulder study detects first known belt of moonlets in Saturn's rings
   10-24-2007 · EurekAlert!
   A narrow belt harboring moonlets as large as football stadiums discovered in Saturn's outermost ring probably resulted when a larger moon was shattered by a wayward asteroid or comet eons ago, according to a University of Colorado at Boulder study.
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6. Ancient coral reef tells the history of Kenya's soil erosion
   04-10-2007 · EurekAlert!
   Coral reefs, like tree rings, are natural archives of climate change. But oceanic corals also provide a faithful account of how people make use of land through history, says Stanford University scientist Robert B. Dunbar. In a recent study published in Geophysical Research Letters, Dunbar and his colleagues used coral samples from the Indian Ocean to create a 300-year record of soil erosion in Kenya.
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7. Rodents tell a geologic tale
   11-11-2006 · Science News Online
   The sudden appearance of many new species of rodents in Chile about 18 million years ago may have marked the rise of the southern Andes.
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8. Saturn's Rings Show Evidence Of A Modern-Day Collision
   10-13-2006 · ScienceDaily
   Scientists with NASA's Cassini mission have spied a new, continuously changing feature that provides circumstantial evidence that a comet or asteroid recently collided with Saturn's innermost ring, the faint D ring.
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9. Dig deeper to find Martian life
   01-30-2007 · EurekAlert!
   Probes designed to find life on Mars do not drill deep enough to find the living cells that scientists believe may exist well below the surface of Mars, according to research led by UCL (University College London). Although current drills may find essential tell-tale signs that life once existed on Mars, cellular life could not survive the radiation levels for long enough any closer to the surface of Mars than a few metres deep -- beyond the reach of even state-of-the-art drills.
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10. Saturn's rings show evidence of a modern-day collision
    10-11-2006 · EurekAlert!
    Scientists on NASA's Cassini mission have spied a new, continuously changing feature that provides circumstantial evidence that a comet or asteroid recently collided with Saturn's innermost ring, the faint D ring.
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