Fig. 3: The nonlinear wind stress response of SST in the observation.
From: El Niño and La Niña asymmetry in short-term predictability on springtime initial condition
a The seasonality of A. b Scatter diagram of Niño 3.4 index and zonal wind stress (Tauu; averaged from 120°E-80°W, 5°S-5°N) from April to June. Red dots represent the response of zonal wind stress to warm SST anomalies. Blue dots are same as red dots, expect for the response on cold SST anomalies. The red line and blue lines are the regression line for this relationship with \({S}_{p}\) is the regression coefficient for red dots and \({S}_{n}\) for blue dots, respectively. c The background of the SST in the Niño 3.4 region for different calendar months. d Regressions of spring (AMJ) tropical Pacific zonal wind stress anomaly of El Niño years onto corresponding Niño3.4 index. Only the regression coefficient exceeding 95% confidence level is shown in the figure. e Same as d, except for the La Niña years.
