Extended Data Fig. 3: Observed changes in the seasonal cycle of TC occurrence and RI occurrence.
From: Seasonal advance of intense tropical cyclones in a warming climate
a, b, The seasonal distribution of the total number of TCs (solid line) and the linear trend in the annual number of TCs (bar; per decade) in each month from 1981 to 2017 obtained from the ADT-HURSAT dataset in the (a) NH, and (b) SH. The diagonal lines indicate significance at the 95% confidence level based on a non-parametric statistical test. The error bars indicate the 95% confidence intervals in the linear regression analysis. c, d, The seasonal distribution of the total number of RI events (solid line) and the linear trend in the annual number of RI events (bar; per decade) in each month from 1981 to 2017 obtained from the ADT-HURSAT dataset in the (c) NH, and (d) SH.