气候变化领域集成服务门户(CCPortal): The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect

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DOI	10.5194/acp-20-6479-2020
	The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect
	Han W.; Li Z.; Wu F.; Zhang Y.; Guo J.; Su T.; Cribb M.; Fan J.; Chen T.; Wei J.; Lee S.-S.
发表日期	2020
ISSN	16807316
起始页码	6479
结束页码	6493
卷号	20 期号:11
英文摘要	The urban heat island intensity (UHII) is the temperature difference between urban areas and their rural surroundings. It is commonly attributed to changes in the underlying surface structure caused by urbanization. Air pollution caused by aerosol particles can affect the UHII through changing (1) the surface energy balance by the aerosol radiative effect (ARE) and (2) planetary-boundary-layer (PBL) stability and airflow intensity by modifying thermodynamic structure, which is referred to as the aerosol dynamic effect (ADE). By analyzing satellite data and ground-based observations collected from 2001 to 2010 at 35 cities in China and using the WRF-Chem model, we find that the impact of aerosols on UHII differs considerably: reducing the UHII in summer but increasing the UHII in winter. This seasonal contrast is proposed to be caused by the different strengths of the ARE and ADE between summer and winter. In summer, the ARE on UHII is dominant over the ADE, cooling down surface temperature more strongly in urban areas than in rural areas because of much higher aerosol loading, and offsets the urban heating, therefore weakening UHII. In winter, however, the ADE is more dominant, because aerosols stabilize the PBL more in the polluted condition, weakening the near-surface heat transport over urban areas in both vertical and horizontal directions. This means that the heat accumulated in urban areas is dispersed less effectively, and thus the UHII is enhanced. These findings shed new light on the impact of the interaction between urbanization-induced surface changes and air pollution on urban climate. © 2020 Copernicus GmbH. All rights reserved.
关键词	aerosol air quality airflow atmospheric pollution boundary layer climate forcing ground-based measurement heat island radiative forcing satellite data surface temperature thermodynamics urbanization
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131992
推荐引用方式 GB/T 7714	Han W.,Li Z.,Wu F.,et al. The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect[J]. Atmospheric Chemistry and Physics,2020,20(11).
APA	Han W..,Li Z..,Wu F..,Zhang Y..,Guo J..,...&Lee S.-S..(2020).The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect.,20(11).
MLA	Han W.,et al."The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect".20.11(2020).