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Evaluating the performance of ENVI-met model in diurnal cycles for different meteorological conditions

Abstract

Urban areas are known to modify meteorological variables producing important differences in small spatial scales (i.e. microscale). These affect human thermal comfort conditions and the dispersion of pollutants, especially those emitted inside the urban area, which finally influence quality of life and the use of public open spaces. In this study, the diurnal evolution of meteorological variables measured in four urban spaces is compared with the results provided by ENVI-met (v 4.0). Measurements were carried out during 3 days with different meteorological conditions in Bilbao in the north of the Iberian Peninsula. The evaluation of the model accuracy (i.e. the degree to which modelled values approach measured values) was carried out with several quantitative difference metrics. The results for air temperature and humidity show a good agreement of measured and modelled values independently of the regional meteorological conditions. However, in the case of mean radiant temperature and wind speed, relevant differences are encountered highlighting the limitation of the model to estimate these meteorological variables precisely during diurnal cycles, in the considered evaluation conditions (sites and weather).

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Acknowledgments

The authors would like to acknowledge Dipl. German Fernandez for the help with the measuring devices and Dipl. Lexuri Yurrebaso for the help during the measurement campaigns. Meteorological data was provided by the Environmental Department and the Basque Meteorological Agency in the Basque Country (Spain). The work leading to these results has received funding from (a) the Basque Government’s ETORTEK programme within the framework of the Basque Science, Technology and Innovation Plan 2010 under the Project K-Egokitzen (2007–2011),and (b) the European Community’s Seventh Framework Programme under Grant Agreement No. 308497, Project RAMSES—Reconciling Adaptation, Mitigation and Sustainable Development for Cities (2012–2016).

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Correspondence to Juan A. Acero.

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Highlights

- ENVI-met Tmrt and WS estimations are not accurate in the conditions of the study.

- ENVI-met Version 4.0 improves Version 3.1 output values of air temperature and humidity.

- It is relevant to know model limitations for micrometeorological assessment procedures.

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Acero, J.A., Arrizabalaga, J. Evaluating the performance of ENVI-met model in diurnal cycles for different meteorological conditions. Theor Appl Climatol 131, 455–469 (2018). https://doi.org/10.1007/s00704-016-1971-y

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  • DOI: https://doi.org/10.1007/s00704-016-1971-y

Keywords

  • Micrometeorological variables
  • Measurements
  • ENVI-met model
  • Difference metrics
  • Diurnal cycles