Traffic Heat Raises Manchester Winter Temps 0.35°C, Study Finds
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- University of Manchester scientists developed a new physics-based module for the Community Earth System Model (CESM) that simulates heat produced by urban traffic, validated against real-world data for Manchester, UK, and Toulouse, France.
- The model showed traffic heat increased simulated Manchester air temperatures by ~0.16°C in summer and 0.35°C in winter — small figures the team says become meaningful during extreme heat events.
- During the July 2022 UK heat wave, the model found traffic-related heat pushed "feels-like" temperatures above dangerous thresholds for longer periods and transferred from street level into buildings, raising summer air conditioning demand.
- Unlike previous approaches, the module can simulate petrol, diesel, hybrid, and electric vehicles separately, letting researchers test how fleet transitions alter the amount of heat traffic adds to cities.
- Dr. Zhonghua Zheng, lead author, said heat from engines, exhausts, and braking has received "far less attention" in large-scale climate models than buildings, materials, and land surfaces.
- First author Yuan Sun urged planners to factor transport systems into climate adaptation and net-zero strategies, not just buildings and land use.
- The study was published in the Journal of Advances in Modeling Earth Systems and used real-world traffic data supplied by Transport for Greater Manchester (TfGM).
Why it matters: City planners and climate modelers can now simulate how shifting vehicle fleets — from diesel to electric — changes urban heat, a variable previously absent from the world's widely used global climate model. Transport for Greater Manchester supplied the real-world traffic data, turning Manchester into a testbed for transport-aware climate adaptation research.
