Fig. 4: Lead–lag regression of 300-hPa winds and SF onto the daily NPO index. | npj Climate and Atmospheric Science

Fig. 4: Lead–lag regression of 300-hPa winds and SF onto the daily NPO index.

From: Part I observational study on a new mechanism for North Pacific Oscillation influencing the tropics

Fig. 4

a Regressed 300 hPa wind (unit: m s−1) and SF (unit: 106 m2 s−1) anomalies with 10 days leading the NPO index; b the same as (a) but for a 5-day lead; c simultaneously regressed wind and SF anomalies onto the daily NPO index; d–f regressed 300 hPa winds and SF anomalies with 5- to 15-day lags, respectively. The area with black arrows shows the zonal winds above 90% confidence level based on Student’s t-test.

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