2018 |
Chrysoulakis, Nektarios; Grimmond, Sue; Feigenwinter, Christian; Lindberg, Fredrik; Gastellu-Etchegorry, Jean-Philippe; Marconcini, Mattia; Mitraka, Zina; Stagakis, Stavros; Crawford, Ben; Olofson, Frans; Landier, Lucas; Morrison, William; Parlow, Eberhard Urban energy exchanges monitoring from space (Journal Article) nature.com , Scientific Reports volume (8), pp. 11498, 2018, ISSN: 2045-2322. (Abstract | Links | BibTeX | Tags: anthropogenic heat emission, Anthropogenic Heat Flux, Concentration profiles, Copernicus Sentinels, Earth Observation, Eddy-covariance, Flux measurements, Ground-based thermography, Image classification, reducing, Sensor view modelling, Street canyon, Thermographic camera modelling, Understanding, Upwelling longwave radiation, urban, Urban Climate, Urban Energy Budget, urban heat fluxes, Urban meteorology) @article{Chrysoulakis2018, title = {Urban energy exchanges monitoring from space}, author = {Nektarios Chrysoulakis and Sue Grimmond and Christian Feigenwinter and Fredrik Lindberg and Jean-Philippe Gastellu-Etchegorry and Mattia Marconcini and Zina Mitraka and Stavros Stagakis and Ben Crawford and Frans Olofson and Lucas Landier and William Morrison and Eberhard Parlow }, editor = {nature.com}, url = {http://urbanfluxes.eu/wp-content/uploads/2018/07/UF_Overview_final.pdf}, doi = {10.1038/s41598-018-29873-x}, issn = {2045-2322}, year = {2018}, date = {2018-07-31}, journal = { nature.com }, volume = {Scientific Reports volume}, number = {8}, pages = {11498}, 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.}, keywords = {anthropogenic heat emission, Anthropogenic Heat Flux, Concentration profiles, Copernicus Sentinels, Earth Observation, Eddy-covariance, Flux measurements, Ground-based thermography, Image classification, reducing, Sensor view modelling, Street canyon, Thermographic camera modelling, Understanding, Upwelling longwave radiation, urban, Urban Climate, Urban Energy Budget, urban heat fluxes, Urban meteorology}, pubstate = {published}, tppubtype = {article} } 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. |
2017 |
Marconcini, Mattia; Heldens, Wieke; Del-Frate, Fabio; Latini, Daniele; Mitraka, Zina; Lindberg, Fredrik EO-based Products in Support of Urban Heat Fluxes Estimation (Conference) 2017. (Abstract | Links | BibTeX | Tags: Anthropogenic Heat Flux, Earth Observation, urban heat fluxes) @conference{Marconcini2017, title = {EO-based Products in Support of Urban Heat Fluxes Estimation}, author = {Mattia Marconcini and Wieke Heldens and Fabio Del-Frate and Daniele Latini and Zina Mitraka and Fredrik Lindberg}, editor = {IEEE}, url = {http://urbanfluxes.eu/wp-content/uploads/2018/01/2017_Marconcini_et_al_JURSE.pdf}, year = {2017}, date = {2017-04-11}, journal = {Urban Remote Sensing Event (JURSE), 2017 Joint 11 May 2017}, abstract = {Presently, there is a growing need for information suitable to effectively characterize the Urban Energy Budget (UEB) and, hence, to properly estimate the magnitude of the anthropogenic heat flux QF. Indeed, a precise knowledge of QF - whose implications for urban planners are still prone to large uncertainties - is fundamental for implementing effective strategies to improve thermal comfort and energy efficiency. To address this challenging issue, the Horizon 2020 URBANFLUXES project aims at developing a novel methodology for accurately estimating the different terms of the UEB based on the use of Earth Observation (EO) data and, hence, at reliably characterizing the QF spatiotemporal patterns and its implications on urban climate. In this paper, we aim at giving an overview of the EO-based products which have been identified as the most useful in the framework of the considered study. In particular, the suite which has been implemented so far in the first phase of the project includes biophysical parameters, morphology parameters as well as land-cover maps.}, keywords = {Anthropogenic Heat Flux, Earth Observation, urban heat fluxes}, pubstate = {published}, tppubtype = {conference} } Presently, there is a growing need for information suitable to effectively characterize the Urban Energy Budget (UEB) and, hence, to properly estimate the magnitude of the anthropogenic heat flux QF. Indeed, a precise knowledge of QF - whose implications for urban planners are still prone to large uncertainties - is fundamental for implementing effective strategies to improve thermal comfort and energy efficiency. To address this challenging issue, the Horizon 2020 URBANFLUXES project aims at developing a novel methodology for accurately estimating the different terms of the UEB based on the use of Earth Observation (EO) data and, hence, at reliably characterizing the QF spatiotemporal patterns and its implications on urban climate. In this paper, we aim at giving an overview of the EO-based products which have been identified as the most useful in the framework of the considered study. In particular, the suite which has been implemented so far in the first phase of the project includes biophysical parameters, morphology parameters as well as land-cover maps. |
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