Abstract Summary
The subsurface of many urban areas worldwide is warming up causing a phenomenon widely known as subsurface urban heat islands (SUHIs). Currently, limited knowledge is available on the intensity and features of the sources of SUHIs. To understand the inherent characteristics of SUHIs, this study presents a unique sensing network composed of >150 wireless temperature sensors deployed in the surface and subsurface environments across the Chicago Loop district. Highly heterogeneous temperatures are observed to characterize the underground-built environments with evidence of a severe subsurface urban heat island in downtown Chicago- the Loop.
