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Last updated on April 24, 2014 at 12:15 EDT

Latest Dendrology Stories

2008-09-02 12:00:00

U.S. climate scientists say the Northern Hemisphere's surface temperatures were higher during the past decade than at any time during the last 1,300 years. The researchers said if they include somewhat controversial data derived from tree-ring records, the warming is anomalous for at least 1,700 years. "Some have argued tree-ring data is unacceptable for this type of study," said Penn State Associate Professor Michael Mann. "Now we can eliminate tree rings and still have enough data from...

2008-08-07 15:00:30

A U.S.-led study has used tree rings to investigate human-induced climate change that's projected to cause drier conditions in the mid-latitudes. To assess whether drier weather conditions have started, Ramzi Touchan of the University of Arizona and colleagues studied newly developed multi-century tree ring records from Tunisia and Algeria for a longer-term perspective on northwestern African drought. Using a set of 13 chronologies from Atlas cedars and Aleppo pines, the scientists...

2008-06-21 15:00:00

By T.J. Greaney, Columbia Daily Tribune, Mo. Jun. 21--On the morning of May 19, 1780, the sky over New England turned a dark red. By noon, people were conducting business by candlelight, nocturnal birds had taken flight and flowers had closed their petals. In the deeply religious Colonies, many people thought Judgment Day was upon them. "Men prayed, and women wept," wrote poet John Greenleaf Whittier in a poem composed years later. "All ears grew sharp/to hear the doom-blast of the...

2007-05-17 18:08:05

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 remarkable for the absence of very wet years.  At the core of the drought was a period of 25 years in which 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...