大气科学学报2025，Vol.48Issue(5)：723-735,13.DOI:10.13878/j.cnki.dqkxxb.20240722001
郑州市下垫面变化影响城市热环境的数值模拟
Impacts of underlying surface changes on the urban thermal environment in Zhengzhou:a numerical simulation
摘要
Abstract
Rapid global urbanization has led to the widespread replacement of natural surfaces with impervious ones,intensifying heat extremes and increasing associated health risks.Understanding how urban expansion influ-ences thermal environments is essential for improving climate resilience and protecting public health.In this study,the Weather Research and Forecasting(WRF)model was used to investigate the impact of underlying surface changes on the urban thermal environment in Zhengzhou,China,focusing on the expansion of urban built-up areas from 2010 to 2020.Results show that urban development radiated outward from Zhengzhou's five central districts,with expansion predominantly occurring in the northern and eastern regions.Built-up land increased by 8.21％,largely at the expense of agricultural land.The WRF model accurately captured monthly temperature vari-ations during July 2020,including the spatial contrast between warmer urban areas and cooler suburban zones.Model performance was particularly strong for nighttime temperature simulations.Numerical results indicate that the 2 m air temperature increased by 0.14 ℃ due to urban expansion over the decade,with greater warming at night than during the day.Nighttime and early morning temperatures rose by over 0.25 ℃,while daytime temper-atures were less affected by land surface changes.Spatially,the most significant warming occurred in newly devel-oped built-up areas,particularly in Jinshui and Guancheng districts,where temperature increases reached 0.50 ℃and 0.47 ℃,respectively.Furthermore,the urban-rural temperature difference grew by 0.26 ℃—from 1.49℃ in 2010 to 1.75 ℃ in 2020-highlighting the intensified urban heat island(UHI)effect.The contribution of urban land expansion to UHI was most pronounced at night,with the maximum temperature increase of 0.52 ℃ occur-ring at 23:00 BST. To examine localized thermal impacts more precisely,the Urban Planetary Boundary Layer Model(UP-BLM),driven by WRF outputs,was applied to simulate thermal conditions in the rapidly developing Beilonghu area.Sensitivity experiments under different land use planning scenarios revealed that the inclusion of water bodies in urban layouts slightly mitigated local warming,providing a cooling effect of approximately 0.17 ℃ at 12:00 BST.These findings underscore the role of urban expansion in intensifying thermal environments and demonstrate that strategic urban planning can partially alleviate these effects.This study offers valuable insights for the devel-opment of climate-resilient and sustainable cities.However,limitations remain:this study does not consider the effects of variations in building morphology on urban heat dynamics,and further researcher is needed to elucidate the underlying mechanisms by which changes in urban surface characteristics influence thermal environments.关键词
WRF/边界层模式/城市热环境Key words
WRF/urban planetary boundary layer model(UPBLM)/urban thermal environment引用本文复制引用
苏晓乐,张宁..郑州市下垫面变化影响城市热环境的数值模拟[J].大气科学学报,2025,48(5):723-735,13.基金项目
中国气象局·河南省农业气象保障与应用技术重点实验室项目(KQ202308 （）
KF202544) （）
河南省省级科技研发计划联合基金项目(232103810090) （232103810090）
河南省科技攻关专项(232102321007) （232102321007）
