Fig. 7: Numerical experiment results.

CAM4 simulations for 850-hPa relative vorticity (shading; 10−6 s−1) and steering flow (vector; m s−1) forced by (A) Indo-Pacific SST anomalies, (B) Indian Ocean SST anomalies, and (C) Pacific SST anomalies. The results are shown as the difference between each sensitive run and the CTRL. The averaged relative vorticity in the red rectangle (80°–130°E, 0°–15°N) is given at the upper right corner.