Typical anomalous wind stress patterns in tropical pacific associated with el nino/southern oscillation

摘要

Based on years of month-to-month observation of sea surface temperature anomaly (SSTA) and wind stress anomaly, typical wind stress patterns in the tropical Pacific associated with ENSO are studied with the techniques of linear regression and EOF analysis. The anomalous field, which is linearly correlated with ENSO, is found to be varying at low frequencies on the temporal scale and to be in four typical patterns of distribution horizontally. Pattern 1 is of the easterly anomaly and wind stress divergence in the equatorial region east of the data line.