Contrasting Effects of Urban Land Cover Change and Anthropogenic Heat on Summer Precipitation Over the Yangtze River Delta of China: Analyses From an Atmospheric Moisture Budget Perspective

Ma, Xinyue; Yang, Ben; Dai, Guoqing; Lin, Huijuan; Yang, Xuchao; Qian, Yun; Zhang, Yaocun; Huang, Anning

doi:10.1029/2023jd039430

Title: Contrasting Effects of Urban Land Cover Change and Anthropogenic Heat on Summer Precipitation Over the Yangtze River Delta of China: Analyses From an Atmospheric Moisture Budget Perspective

Journal Article · 11 May 2024 · Journal of Geophysical Research. Atmospheres

DOI: https://doi.org/10.1029/2023jd039430 · OSTI ID:2496209

Ma, Xinyue ^[1];

^[1]; Dai, Guoqing ^[1]; Lin, Huijuan ^[2];

^[3];

^[4];

^[1];

^[1]

Nanjing Univ. (China)
Suzhou Meteorological Bureau of Jiangsu Province (China)
Zhejiang Univ., Hangzhou (China)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Both urban land cover (ULC) change and anthropogenic heat (AH) emission are important causes of urban heat island, but their relative contributions to the changes in urban precipitation and the related mechanism remain unclear. Based on numerical simulations utilizing the latest realistic urban fraction and AH data over the Yangtze River Delta urban agglomeration, we found that ULC and AH resulted in nearly opposite effects on precipitation. Various dynamical and thermodynamic processes were involved according to the atmospheric moisture budget analyses. AH increased precipitation particularly during afternoon, and the increases were stronger during heavy precipitation events because of the enhanced moisture convergence effect together with the release of moisture storage previously accumulated in the atmosphere. Differently, ULC reduced mean precipitation mainly due to suppressed evaporation. During weak precipitation events, the suppressed evaporation was largely balanced by the intensified moisture convergence, but during heavy events, ULC caused more pronounced precipitation reduction because the moisture convergence response disappeared and failed to offset the evaporation effect. Here, the relative contributions of different dynamical and thermodynamic processes such as those related to circulation, moisture gradient, and background moisture availability to the temporal variation in the total moisture convergence were further quantified. Overall, our results help better understand the relative roles of different aspects of urbanization on precipitation, and suggest that compared to ULC, reduction in AH emission that is tightly related to the energy consumption structure could be more efficient for mitigating the risk of extreme precipitation.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2496209

Report Number(s):: PNNL-SA--202431

Journal Information:: Journal of Geophysical Research. Atmospheres, Journal Name: Journal of Geophysical Research. Atmospheres Journal Issue: 10 Vol. 129; ISSN 2169-897X

Publisher:: American Geophysical Union; WileyCopyright Statement

Country of Publication:: United States

Language:: English

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