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Latest UA's Laboratory of Tree-Ring Research Stories

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2010-12-14 06:25:00

An unprecedented, decades-long combination of heat and drought could be headed to the Southwest United States sometime this century, according to a new study by researchers at the University of Arizona. The scientists reviewed previous studies of temperature changes and droughts in the region over the past 1,200 years, and concluded that a 60-year drought similar to the one that occurred during the 12th Century could be in our future. "Major 20th century droughts pale in comparison to...

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2010-05-26 09:42:42

Droughts in the late 20th century rival some of North Africa's major droughts of centuries past, reveals new research that peers back in time to the year 1179. The first multi-century drought reconstruction that includes Morocco, Algeria and Tunisia shows frequent and severe droughts during the 13th and 16th centuries and the latter part of the 20th century. An international research team figured out northwest Africa's climate history by using the information recorded in tree rings. The...

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2010-03-18 09:25:00

A 3,000-year record from 52 of the world's oldest trees shows that California's western Sierra Nevada was droughty and often fiery from 800 to 1300, according to new research. Scientists reconstructed the 3,000-year history of fire by dating fire scars on ancient giant sequoia trees, Sequoiadendron giganteum, in the Giant Forest of Sequoia National Park. Individual giant sequoias can live more than 3,000 years. "It's the longest tree-ring fire history in the world, and it's from this amazing...


Word of the Day
call-note
  • The call or cry of a bird or other animal to its mate or its young.
'Call-note' is newer than 'bird-call,' which originally referred to 'an instrument for imitating the note of birds' but now also refers to 'the song or cry of a bird.'
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