Climatic Research Unit : Data : Paleoclimate

Luterbacher et al NAO Reconstructions back to 1500

Reconstructed monthly NAO index back to December 1658 and seasonal estimates 1500-1658.

The NAO index is defined as the standardized (1901-1980) difference between the SLP average of four gridpoints on a 5x5 longitude-latitude grid over the Azores and over Iceland.

The reconstructions are based on a Principal Component Regression Analysis. More details can be found in Luterbacher et al. (2002)

Contact Juerg Luterbacher ( for further information, for other reconstructed atmospheric circulation indices and for reprints.

naomonjurg.dat 60 kilobytesMonthly 1659-Jul2001
naoseajurg.dat 10 kilobytesSeasonal 1500-1658

Last updated: May 2002, Mike Salmon

These datasets are made available under the Open Database License.
Any rights in individual contents of the datasets are licensed under the
Database Contents License under the conditions of Attribution and Share-Alike.
Please use the attribution Climatic Research Unit, University of East Anglia