Recent increases in drought frequency cause observed multi-year drought legacies in the tree rings of semi-arid forests

Paul Szejner, University of Arizona, Laboratory of Tree-Ring Research, Tucson, AZ, United States, Soumaya Belmecheri, University of Arizona, Laboratory of Tree Ring Research, Tucson, AZ, United States, James R Ehleringer, Univ Utah, Salt Lake City, UT, United States and Russell K Monson, Univ of Arizona, Tucson, AZ, United States
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