Observed decadal tropical Pacific–North Atlantic teleconnections
Article first published online: 30 DEC 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 24, December 2008
How to Cite
2008), Observed decadal tropical Pacific–North Atlantic teleconnections, Geophys. Res. Lett., 35, L24810, doi:10.1029/2008GL035901., , and (
- Issue published online: 30 DEC 2008
- Article first published online: 30 DEC 2008
- Manuscript Accepted: 20 NOV 2008
- Manuscript Revised: 13 NOV 2008
- Manuscript Received: 9 SEP 2008
- decadal climate variability;
 Observations of the last century are considered to investigate the decadal scale Pacific/North Atlantic teleconnections. By using wavelet analysis we find a significant low-frequency coherency between major indices of climate variability. In particular, at periods between 10 and 20 yr, the North Atlantic Oscillation (NAO) tends to be out of phase with the El Niño/Southern Oscillation (ENSO) (strong Icelandic low during La Niña) and the Pacific Decadal Oscillation (PDO), but in phase with the North Pacific Index (NPI). Hence, the Icelandic low is strong during La Niña, but the Aleutian low is weak. The band-pass SST pattern shows a close relationship between the “decadal-ENSO” mode in the Pacific and the sea surface temperature anomaly tripole in the Atlantic, consistent with the low-frequency global teleconnections. The spatial sea level patterns corresponding to the band-pass filtered indices suggest that the Aleutian-Icelandic Low seesaw is a main interbasin link on decadal time scale, consistent with the larger coherency of the NPI with the NAO than with ENSO.