Fig. 1: Characteristics of TC genesis and GPI anomalies in the WNP and SCS during different types of La Niña events.
From: More autumn tropical cyclone genesis in the South China Sea during El Niño to La Niña transition
Composites of TC genesis positions (black dots) and GPI anomalies (shading, 1/°C) for a all La Niña years, b cyclic La Niña, c multi-year La Niña, and d episodic La Niña in autumn (SON) during their developing phases. White stippling indicates the significance of composite anomalies at the 95% confidence level. e Annual TC genesis frequency (1/°C) over WNP (0°–30°N, 99°E–180°), and SCS (0°–23°N, 99°–121°E) for all La Niña, cyclic La Niña, multi-year La Niña, and episodic La Niña events in SON during their developing phases, respectively. The GPI anomalies and TC genesis frequency are normalized by the absolute value of SST anomalies averaged over Niño 3.4. The red asterisk “*” above the bar denotes that the frequency is different from that of other La Niña evolution types at the 90% confidence level. The purple and green rectangles in (a–d) represent the WNP and SCS region analyzed in this study.
