Contrasting characteristics of the surface energy balance between the urban and rural areas of Beijing

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• 作者：Linlin Wang (1) (2)
  Zhiqiu Gao (1)
  Shiguang Miao (3)
  Xiaofeng Guo (1)
  Ting Sun (4)
  Maofeng Liu (5)
  Dan Li (6)
  
  1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry ; Institute of Atmospheric Physics ; Chinese Academy of Sciences ; Beijing ; 100029 ; China
  2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters ; Nanjing University of Information Science & Technology ; Nanjing ; Jiangsu ; 210044 ; China
  3. Institute of Urban Meteorology ; China Meteorological Administration ; Beijing ; 100089 ; China
  4. State Key Laboratory of Hydroscience and Engineering ; Department of Hydraulic Engineering ; Tsinghua University ; Beijing ; 100084 ; China
  5. Department of Civil and Environmental Engineering ; Princeton University ; Princeton ; NJ ; 08540 ; USA
  6. Program of Atmospheric and Oceanic Sciences ; Princeton University ; Princeton ; NJ ; 08540 ; USA
  
• 关键词：aerosol load ; cloud ; evapotranspiration ; surface energy balance ; urbanization
• 刊名：Advances in Atmospheric Sciences
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：32
• 期：4
• 页码：505-514
• 全文大小：1,288 KB
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• 刊物主题：Atmospheric Sciences; Meteorology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9533

文摘

A direct comparison of urban and rural surface energy balances, as well as a variety of other variables including incoming shortwave/longwave radiation and aerosol optical depth, is conducted for the Beijing metropolitan area. The results indicate that, overall, the urban area receives a smaller amount of incoming shortwave radiation but a larger amount of incoming longwave radiation. However, comparisons in the aerosol optical depth and cloud fraction at the two locations suggest that neither aerosol optical depth nor cloud fraction alone can explain the difference in the incoming shortwave radiation. The urban-rural differences in the incoming longwave radiation are unlikely to be caused by the presence of more abundant greenhouse gases over the urban area, as suggested by some previous studies, given that water vapor is the most dominant greenhouse gas and precipitable water is found to be less in urban areas. The higher incoming longwave radiation observed over the urban area is mostly likely due to the higher temperatures of the ambient air. The urban area is also found to always produce higher sensible heat fluxes and lower latent heat fluxes in the growing season. Furthermore, the urban area is associated with a larger amount of available energy (the sum of sensible and latent heat fluxes) than the rural area, except in May and October when evapotranspiration in the rural area significantly exceeds that in the urban area. This study provides observational evidence of urban-rural contrasts in relevant energy-balance components that plausibly arise from urban-rural differences in atmospheric and land-surface conditions.