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Title: The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect

Abstract

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-surfacemore » 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.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.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [3];  [4];  [2];  [2];  [3];  [4]; ORCiD logo [1]; ORCiD logo [2]
  1. Beijing Normal Univ. (China); Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Chinese Academy of Meteorological Sciences, Beijing (China)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1642425
Report Number(s):
PNNL-SA-153006
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 20; Journal Issue: 11; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Han, Wenchao, Li, Zhanqing, Wu, Fang, Zhang, Yuwei, Guo, Jianping, Su, Tianning, Cribb, Maureen, Fan, Jiwen, Chen, Tianmeng, Wei, Jing, and Lee, Seoung-Soo. The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect. United States: N. p., 2020. Web. doi:10.5194/acp-20-6479-2020.
Han, Wenchao, Li, Zhanqing, Wu, Fang, Zhang, Yuwei, Guo, Jianping, Su, Tianning, Cribb, Maureen, Fan, Jiwen, Chen, Tianmeng, Wei, Jing, & Lee, Seoung-Soo. The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect. United States. https://doi.org/10.5194/acp-20-6479-2020
Han, Wenchao, Li, Zhanqing, Wu, Fang, Zhang, Yuwei, Guo, Jianping, Su, Tianning, Cribb, Maureen, Fan, Jiwen, Chen, Tianmeng, Wei, Jing, and Lee, Seoung-Soo. Fri . "The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect". United States. https://doi.org/10.5194/acp-20-6479-2020. https://www.osti.gov/servlets/purl/1642425.
@article{osti_1642425,
title = {The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect},
author = {Han, Wenchao and Li, Zhanqing and Wu, Fang and Zhang, Yuwei and Guo, Jianping and Su, Tianning and Cribb, Maureen and Fan, Jiwen and Chen, Tianmeng and Wei, Jing and Lee, Seoung-Soo},
abstractNote = {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.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.},
doi = {10.5194/acp-20-6479-2020},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 11,
volume = 20,
place = {United States},
year = {2020},
month = {6}
}

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