Abstract:
Reconstruction of the Nino3 Index of El Nino-Southern Oscillation variability, for the months of December through February each year, based on tree ring data from northern Mexico and Texas, USA.
The reconstruction uses factor scores from a Principal Components Analysis (PCA) of time t and selected t-1 and t+1 lags of 14 tree-ring chronologies from northern Mexico (Durango and Chihuahua) and the southwestern U.S.A. (Arizona, Utah and New Mexico) plus the first two factor scores from a network of 9 chronologies in OK and TX as independent variables. All chronologies were compiled from indices of tree growth (earlywood or total ring width) detrended to remove biological trends (Cook 1985).
