18 Lags 



100 200 300 



AGE (x10 3 yr) 



Figure 32. — Cross correlation of oxygen isotopes and 

 carbonate concentrations in core VI 9-29. At 

 the bottom, the number of sample intervals 

 indicated by the maximum correlation offsets 

 plots of the two records. 



Lag=70 



Feb Temperatures 

 310=N 



Pisias GSO/UHI 



50 



0.2 03 0.4 05 



Frequency in Cycles/Sample Interval (25 yr) 



Figure 33. — Spectra for unsmoothed February sea-surface time series. BW= Band- 

 width of smoothing window, C.I. = 80 percent confidence for spectral 

 estimates, Lag = number of autocorrelation values used to calculate 

 spectra, N = number of data points in time series. C(F) = temperature 

 variance. 



