Fig. 4: Response of vertical motion to the decay of double-year La Niña events.
(a–f) The 200 hPa velocity potential anomaly (contours, unit: 105 m2/s) and precipitation anomaly (shading, unit: mm) from JFM(2) to JJA(2) of double-year La Niña events. Gray dots indicate the precipitation anomaly above the 95% confidence level based on Student’s t test. Blue dashed line and brown line represent respectively negative and positive 200 hPa velocity potential anomaly during the decaying year of double-year La Niña events. Negative velocity potential indicates low-level convergence.
