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Journal of Applied Meteorology and Climatology

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Editorial Type:
Article
Article Type:
Research Article

Numerical Analysis on the Contribution of Urbanization to Wind Stilling: An Example over the Greater Beijing Metropolitan Area

Aizhong Hou1, Guangheng Ni2, Hanbo Yang2, and Zhidong Lei2
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  • 1 State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, and Bureau of Hydrology, Ministry of Water Resources, Beijing, China
  • | 2 State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China
Print Publication:
01 May 2013
DOI:
https://doi.org/10.1175/JAMC-D-12-013.1
Page(s):
1105–1115
Restricted access

Abstract

A decline of surface wind speed (wind stilling) has been observed in many regions of the world. The greater Beijing metropolitan area in China is taken as an example for analyzing the urbanization impact on wind stilling. This study set up five scenarios with different urbanization ratios and the same atmospheric forces and then simulated wind speed under each scenario using the next-generation Weather Research and Forecasting model. The results suggest that the correspondence between the regional average wind speed ratio of decrease Δu and the ratio of urbanized area δurban (%) fits the relation in summer and in winter. During the period 1961–2008, the ratio of urbanized area over the greater Beijing metropolitan area increased from 1.3% to 11.9%, which is speculated as the cause of a 0.4 m s−1 decline in regional average wind speed and the contributor to about 35% wind stilling.

Corresponding author address: Hanbo Yang, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China. E-mail: yanghanbo@tsinghua.edu.cn

Abstract

A decline of surface wind speed (wind stilling) has been observed in many regions of the world. The greater Beijing metropolitan area in China is taken as an example for analyzing the urbanization impact on wind stilling. This study set up five scenarios with different urbanization ratios and the same atmospheric forces and then simulated wind speed under each scenario using the next-generation Weather Research and Forecasting model. The results suggest that the correspondence between the regional average wind speed ratio of decrease Δu and the ratio of urbanized area δurban (%) fits the relation in summer and in winter. During the period 1961–2008, the ratio of urbanized area over the greater Beijing metropolitan area increased from 1.3% to 11.9%, which is speculated as the cause of a 0.4 m s−1 decline in regional average wind speed and the contributor to about 35% wind stilling.

Corresponding author address: Hanbo Yang, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China. E-mail: yanghanbo@tsinghua.edu.cn
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