Fig. 2: Composite of winds, geopotential height, and SST associated with positive NPO in monthly average.
From: Part I observational study on a new mechanism for North Pacific Oscillation influencing the tropics
Composite difference of D0JF1-averaged a 300 hPa winds (vector; unit: m s−1) and geopotential (shading; unit: 10 gpm), and b 850 hPa winds (vector; unit: m s−1), precipitation (represented by dots) and SST (shading; unit: °C) anomalies between 10 positive and 10 negative NPO events. c, d are the same as (a) and (b), except that they are for March. The areas with shades represent anomalies significant above 90% confidence level, and the areas with black arrows represent the zonal wind above 90% confidence level based on the Student’s t-test. The red (blue) dots in (b) and (d) represent the positive (negative) precipitation anomalies significant at 90% confidence level, whereas the size represents the magnitude.
