Fig. 3: The composite of SF and WAF in DJF and March.
From: Part I observational study on a new mechanism for North Pacific Oscillation influencing the tropics

The composite differences of SF (shading; unit: 106 m2 s−1) between the positive and negative NPO years and calculated WAF (vector; unit: m2 s−2) based on SF anomalies for a D0JF1 and b March. Only the magnitude of the WAF larger than 0.1 is displayed. The area with red dots means that the SF anomalies are significant above 90% confidence level based on Student’s t-test.