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Journal Articles Scientific Reports Year : 2018

Urban energy exchanges monitoring from space

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Nektarios Chrysoulakis
  • Function : Author
Sue Grimmond
  • Function : Author
Christian Feigenwinter
  • Function : Author
Fredrik Lindberg
  • Function : Author
Mattia Marconcini
  • Function : Author
Zina Mitraka
  • Function : Author
Stavros Stagakis
  • Function : Author
Ben Crawford
  • Function : Author
Frans Olofson
  • Function : Author
William Morrison
  • Function : Author
Eberhard Parlow
  • Function : Author

Abstract

One important challenge facing the urbanization and global environmental change community is to understand the relation between urban form, energy use and carbon emissions. Missing from the current literature are scientific assessments that evaluate the impacts of different urban spatial units on energy fluxes; yet, this type of analysis is needed by urban planners, who recognize that local scale zoning affects energy consumption and local climate. Satellite-based estimation of urban energy fluxes at neighbourhood scale is still a challenge. Here we show the potential of the current satellite missions to retrieve urban energy budget fluxes, supported by meteorological observations and evaluated by direct flux measurements. We found an agreement within 5% between satellite and in-situ derived net all-wave radiation; and identified that wall facet fraction and urban materials type are the most important parameters for estimating heat storage of the urban canopy. The satellite approaches were found to underestimate measured turbulent heat fluxes, with sensible heat flux being most sensitive to surface temperature variation (-64.1, +69.3 W m-2 for ±2 K perturbation). They also underestimate anthropogenic heat fluxes. However, reasonable spatial patterns are obtained for the latter allowing hot-spots to be identified, therefore supporting both urban planning and urban climate modelling.
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insu-03668273 , version 1 (16-05-2022)

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Attribution - CC BY 4.0

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Nektarios Chrysoulakis, Sue Grimmond, Christian Feigenwinter, Fredrik Lindberg, Jean-Philippe Gastellu-Etchegorry, et al.. Urban energy exchanges monitoring from space. Scientific Reports, 2018, 8, ⟨10.1038/s41598-018-29873-x⟩. ⟨insu-03668273⟩
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