Deciphering the sensitivity of urban canopy air temperature to anthropogenic heat flux with a forcing-feedback framework

Wang, Linying; Sun, Ting; Zhou, Wenyu; Liu, Maofeng; Li, Dan

doi:10.1088/1748-9326/ace7e0

Deciphering the sensitivity of urban canopy air temperature to anthropogenic heat flux with a forcing-feedback framework

Journal Article · Mon Aug 14 00:00:00 EDT 2023 · Environmental Research Letters

DOI:https://doi.org/10.1088/1748-9326/ace7e0· OSTI ID:1995029

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Abstract

The sensitivity of urban canopy air temperature ( $T_{a}$ ) to anthropogenic heat flux ( $Q_{A H}$ ) is known to vary with space and time, but the key factors controlling such spatiotemporal variabilities remain elusive. To quantify the contributions of different physical processes to the magnitude and variability of $Δ T_{a} / Δ Q_{A H}$ (where $Δ$ represents a change), we develop a forcing-feedback framework based on the energy budget of air within the urban canopy layer and apply it to diagnosing $Δ T_{a} / Δ Q_{A H}$ simulated by the Community Land Model Urban over the contiguous United States (CONUS). In summer, the median $Δ T_{a} / Δ Q_{A H}$ is around 0.01 $K {(W m^{- 2})}^{- 1}$ over the CONUS. Besides the direct effect of $Q_{A H}$ on $T_{a}$ , there are important feedbacks through changes in the surface temperature, the atmosphere–canopy air heat conductance ( $c_{a}$ ), and the surface–canopy air heat conductance. The positive and negative feedbacks nearly cancel each other out and $Δ T_{a} / Δ Q_{A H}$ is mostly controlled by the direct effect in summer. In winter, $Δ T_{a} / Δ Q_{A H}$ becomes stronger, with the median value increased by about 20% due to weakened negative feedback associated with $c_{a}$ . The spatial and temporal (both seasonal and diurnal) variability of $Δ T_{a} / Δ Q_{A H}$ as well as the nonlinear response of $Δ T_{a}$ to $Δ Q_{A H}$ are strongly related to the variability of $c_{a}$ , highlighting the importance of correctly parameterizing convective heat transfer in urban canopy models.

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Sponsoring Organization:: USDOE

OSTI ID:: 1995029

Alternate ID(s):: OSTI ID: 2204830
OSTI ID: 1991121

Journal Information:: Environmental Research Letters, Journal Name: Environmental Research Letters Journal Issue: 9 Vol. 18; ISSN 1748-9326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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