The results of the study of synoptic-range spectra of the currents in
the POLYMODE area are presented. Multiple time series of velocity with
missing observation modelling is suggested by the autoregressive proc
esses of optimal order p (AR-models). It is shown that the synoptic ma
ximum at periods between 50 and 70 days is observed in the estimated s
pectra of high-order (p greater-than-or-equal-to 15) approximating AR-
models.