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Summary: Variable intensity of teleconnections during the late Holocene in
subtropical North America from an isotopic study of speleothem from
Florida
Philip E. van Beynen,1
Yemane Asmerom,2
Victor Polyak,2
Limaris Soto,3
and Jason S. Polk1
Received 19 June 2007; revised 8 August 2007; accepted 9 August 2007; published 22 September 2007.
[1] The persistence and influence of both tropical and extra-
tropical teleconnections on the hydrology of subtropical
North America are little understood. Major atmospheric-
oceanic controls on the isotopic composition of the
precipitation reconstructed from a 1,000 year old stalagmite
are the North Atlantic Oscillation (NAO) and the Pacific
Decadal Oscillation (PDO). These teleconnections create
decadal- to centennial-scale changes in the seasonal
distribution of precipitation. An increase in the winter
proportion of annual precipitation coincides with negative
phase NAO conditions and a positive phase PDO. However,
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