Diurnal asymmetry in nonlinear responses of  canopy urban heat island to urban morphology  in Beijing during heat wave periods

Shi, Tao; Yang, Yuanjian; Qi, Ping; Lolli, Simone

doi:10.5194/acp-25-17069-2025

Articles | Volume 25, issue 22

https://doi.org/10.5194/acp-25-17069-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-17069-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 22

Research article

|

28 Nov 2025

Research article |

| 28 Nov 2025

Diurnal asymmetry in nonlinear responses of canopy urban heat island to urban morphology in Beijing during heat wave periods

Tao Shi, Yuanjian Yang, Ping Qi, and Simone Lolli

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Cumulative views and downloads (calculated since 16 Jul 2025)

Month	HTML	PDF	XML	Total
Jul 2025	358	60	36	454
Aug 2025	402	66	20	488
Sep 2025	1,002	26	18	1,046
Oct 2025	84	28	10	122
Nov 2025	191	73	11	275
Dec 2025	301	205	21	527
Jan 2026	292	644	17	953
Feb 2026	199	182	16	397
Mar 2026	212	523	21	756
Apr 2026	195	151	11	357
May 2026	148	124	5	277
Jun 2026	23	14	5	42

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Short summary

Using Beijing’s Fifth Ring Road, the team combined data and models. Heatwave results: canopy heat island was 91.3 % stronger day/52.7 % night. Day heat relied on building coverage, night on sky visibility. Tall buildings block sun by day, trap heat at night. Night ventilation cools, day winds spread heat. Urban design must consider day-night cycles to fight extreme heat, guiding risk reduction.