Extended Data Fig. 2: Observed precipitation variations and its relationship with Atlantic ITCZ position.
From: Increased extreme swings of Atlantic intertropical convergence zone in a warming climate
a, Time-series of precipitation first principal component (PC1) in the boreal spring in the observational record. b, Linear relationship between precipitation PC1 and latitude position of the Atlantic ITCZ in the boreal spring. The correlation (R) and its P-value are indicated. Red dot and blue dots in a and b indicate the years with an extreme northward swing event (1983) and six moderate northward swing events (1990, 1992, 1993, 1998, 2010, and 2012), respectively. The highly-correlated relationship between precipitation PC1 and ITCZ position suggests that the first EOF mode of precipitation represents the interannual springtime meridional swings of the Atlantic ITCZ.
