Represent anthropogenic-heat release pathways

Develop physically based data and parameterizations that explicitly represent the release pathways of anthropogenic heat, including the vertical distribution and physical characteristics of heat emitted by vehicles, HVAC systems, industrial stacks, and underground infrastructure, so that urban climate models can distinguish pathways with different climatic effects.

Background

Anthropogenic heat flux is increasingly disaggregated into building, transportation, industrial, and metabolic sources, but sectoral classification does not specify how or where the heat enters the urban atmosphere. Heat released at street level, above roofs, from industrial stacks, or from underground infrastructure can interact differently with turbulence, advection, and urban surfaces. The review identifies explicit representation of these pathways as necessary for physically usable forcing datasets and next-generation urban climate models.

References

This makes source-pathway representation a major unresolved challenge in anthropogenic heat research.

— Anthropogenic Heat in Urban Climate Systems: Forcing, Sensitivity, and Feedback  (2608.17782 - Li et al., 18 Aug 2026) in Section 3, subsection “Source and release pathway representation”

However, there is no generally accepted approach for constructing this counterfactual estimate at present, and some implementations may raise energy-conservation concerns.

— Anthropogenic Heat in Urban Climate Systems: Forcing, Sensitivity, and Feedback  (2608.17782 - Li et al., 18 Aug 2026) in Section 2, subsection “Climate feedback parameters”; Section 6, subsection “Diagnosing feedback parameters”

Although the sign of source feedback appears to be relatively well established in many conventional heating and cooling systems, quantitative estimates remain limited, leaving its dependence on climate, building characteristics, energy systems, technology, and human behavior largely unknown.

— Anthropogenic Heat in Urban Climate Systems: Forcing, Sensitivity, and Feedback  (2608.17782 - Li et al., 18 Aug 2026) in Section 6, subsection “Understanding feedback parameters”

This pathway is conceptually similar to a positive source feedback, although it has not generally been quantified explicitly using a feedback parameter.

— Anthropogenic Heat in Urban Climate Systems: Forcing, Sensitivity, and Feedback  (2608.17782 - Li et al., 18 Aug 2026) in Section 6, subsection “Understanding feedback parameters”