Fig. 2: The influence of urbanization on the onset date of summertime CoHot events.
From: Urbanization brings earlier onset of summertime compound heatwaves
a Spatial distributions of the average differences in Cohot events onset dates (\(\Delta {{\rm{CoHot}}}_{{\rm{date}}}\)) between urban and rural paired stations during 1971–2017. Circles mean the differences pass the student’s t test at 90% confidence level. b Cumulative distribution function (CDF) and probability density function (PDF) of \(\Delta {{\rm{CoHot}}}_{{\rm{date}}}\) from panel (a). c Mean \(\Delta {{\rm{CoHot}}}_{{\rm{date}}}\) for China (CA), Europe (EU), the United State (US), and Australia (AU), with error bars representing the 5–95% uncertainty. Uncertainty estimates were derived from 10,000 bootstrap resamplings, stratified by five climate zones (Supplementary Table 1) with 80% of samples in each iteration. Note that positive \(\Delta {{\rm{CoHot}}}_{{\rm{date}}}\) values indicate that CoHot event occurs earlier at urban stations than at rural stations.
