Variable intensity of teleconnections during the late Holocene in subtropical North America from an isotopic study of speleothem from Florida
Article first published online: 22 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Variable intensity of teleconnections during the late Holocene in subtropical North America from an isotopic study of speleothem from Florida, Geophys. Res. Lett., 34, L18703, doi:10.1029/2007GL031046., , , , and (
- Issue published online: 22 SEP 2007
- Article first published online: 22 SEP 2007
- Manuscript Accepted: 9 AUG 2007
- Manuscript Revised: 8 AUG 2007
- Manuscript Received: 19 JUN 2007
- climate change;
 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, the PDO's influence appears to be weakened when it is out of phase with the El Niño Southern Oscillation (ENSO). The NAO exerts the greater decadal influence on this regions climate than the El Niño Southern Oscillation (ENSO), suggesting a greater significance of high latitude controls on subtropical North America.