Pure and Applied Geophysics

, Volume 167, Issue 11, pp 1433–1449

The Impact of Canyon Geometry on Intra Urban and Urban: Suburban Night Temperature Differences Under Warm Weather Conditions

  • K. Giannopoulou
  • M. Santamouris
  • I. Livada
  • C. Georgakis
  • Y. Caouris
Article

Abstract

The present paper investigates the impact of canyon geometry on the temperature regime and nocturnal heat island development in the very dense urban area of Athens, Greece. Detailed measurements of air temperature have been carried out within three deep urban canyons of different aspect ratios (H/W = 3, 2.1 and 1.7) during the night period of the summer and autumn of 2007. An analysis was carried out to investigate the relative impact of the canyon geometry, the undisturbed wind velocity, ambient temperature, and cloud cover on the development of a nocturnal heat island. A clear increase of the median, maximum and minimum values of the cooling rates has been observed for decreasing aspect ratios. Under low ambient temperatures, high wind speeds correspond to a substantial rise of the cooling rate in the urban canyons mainly because of the increased convective losses. On the contrary, cooling rates decrease substantially under high-undisturbed wind speeds and ambient temperatures because of the important convective gains. The impact of cloud cover was found to be important as cloudy skies cause a substantial decrease of the cooling rates in the urban canyons. Comparisons were performed between the temperature data collected in the three studied urban canyons and temperatures recorded in an urban as well as a suburban open space station.

Keywords

Nocturnal heat island Urban canyon Aspect ratio (H/W

References

  1. Arnfield, A. J. (1990), Canyon geometry, the urban fabric and nocturnal cooling: a simulation approach, Phys. Geography. 11, 209–239.Google Scholar
  2. Assimakopoulos, V. D., Georgakis, C., and Santamouris, M. (2006), Experimental Validation of Computational Fluid Dynamics Code to Predict the Wind Speed in Street Canyons for Passive Cooling Purposes, Solar Energy. 80, 423–434.Google Scholar
  3. Bottyan, Z., and Unger, J. (2003), A multiple linear statistical model for estimating the mean maximum urban heat island, Theor. Appl. Climatol. 75, 233–243.Google Scholar
  4. Cartalis, C., Synodinou, A., Proedrou, M., Tsangrassoulis, A., and Santamouris, M. (2001), Modifications in Energy Demand in urban areas as a result of climate changes: an assessment for the southeast Mediterranean region, J. Energy Convers. Manage. 42, 14, 1647–1656.Google Scholar
  5. Chandler, T. J. (1961), Surface breeze effects of Leicester’s heat-island, East. Midland Geogr. Nottingham. 15, 32–38.Google Scholar
  6. Chang, P. C., Wang, P. N. and Lin, A. (1971), ‘Turbulent diffusion in a city street'. Proceedings of the Symposium on Air Pollution and Turbulent Diffusion, 7–10 December 1971, Las Cruces, New Mexico, pp. 137–144.Google Scholar
  7. Chow, W., Roth, M. (2006), Temporal dynamics of the urban heat island of Singapore, Int. J. Climatol. 26, 2243–2260.Google Scholar
  8. Christen, A., Vogt, R. (2004), Energy and radiation balance of a central European city, Int. J. Climatol. 24, 1394–1421.Google Scholar
  9. Eliasson, I. (1996), Urban Nocturnal Temperatures, Street Geometry and Land Use, Atmos. Environ. 30, 379–392.Google Scholar
  10. Eliasson, I., and Holmer, B. (1990), Urban heat island circulation in Goteborg, Sweden, Theor. Appl. Climatol. 42, 187–196.Google Scholar
  11. Emmanuel, R., Rosenlund, H., and Johansson, E. (2007), Urban shading – a design option for the tropics? A study in Colombo, Sri Lanka, Int. J. Climatol. 27, 1995–2004.Google Scholar
  12. Erell, E., and Williamson, T. (2007), Intra-urban differences in canopy layer air temperature at a mid-latitude city, Int. J. Climatol. 27, 1243–1255.Google Scholar
  13. Georgakis, C., and Santamouris, M. (2004), On the Airflow in Urban Canyons for Ventilation Purposes, The Int. J. Ventilation. 3, 53–66.Google Scholar
  14. Georgakis, C., Santamouris, M. (2006), Experimental investigation of air flow and temperature distribution in deep urban canyons for natural ventilation purposes, Energy Build. 38, 367–376.Google Scholar
  15. Georgakis, C., Santamouris, M. (2008), On the Estimation of Wind Speed in Urban Canyons for Ventilation Purposes. Part One: Coupling Between the Undisturbed Wind Speed and the Canyon Wind, Build. Environ. 43, 8, 1404–1410.Google Scholar
  16. Geros, V., Santamouris, M., Tsangrassoulis, A., and Guarracino, G. (1999), Experimental Evaluation of Night Ventilation Phenomena, Energy Build. 29, 141–154.Google Scholar
  17. Geros, V., Santamouris, M., Karatasou, S., Tsangrassoulis, A., and Papanikolaou, N. (2005), On the Cooling Potential of Night Ventilation Techniques in the Urban Environment, Energy Build. 37, 243–257.Google Scholar
  18. Ghiaus, C., Allard, F., Santamouris, M., Georgakis, C., Nicol, F. (2006), Urban environment influence on natural ventilation potential, Build. Environ. 41, 395–406.Google Scholar
  19. Goh, K. C., and Chang, C. H. (1999), The Relanshioship Beetween Height to Width Ratios and the Heat Island Intensity at 22:00 h for Singapore, Int. J. Climatol. 19, 1011–1023.Google Scholar
  20. Grimmond, C. S. B., Salmond, J. A., Oke, T. R., Offerle, B., Lemonsu, A. (2004), Flux and turbulence measurements at a dense urban site in Marseille: heat, mass (water, carbon dioxide) and momentum, J. Geophys. Res. Atmos. 109, (D24101) 1–19.Google Scholar
  21. Haeger–Eugensson and Holmer, B. (1999), Advection Caused by the Urban Heat Island Circulation as a Regulating Factor on the Nocturnal Urban Heat Island, Int. J. Climatol. 19, 975–988.Google Scholar
  22. Hassid, S., Santamouris, M., Papanikolaou, N., Linardi, A., Klitsikas, N., Georgakis, C., Assimakopoulos, D. N. (2000), The Effect of the Athens Heat Island on Air Conditioning Load, Energy Build. 32, 131–141.Google Scholar
  23. Holmer, B. (1992), A simple operative method for determination of sky view-factors in complex urban canyons from fish-eye photographs, Met. Zeit. Neue Folge. 1, 236–239.Google Scholar
  24. Holmer, B., Thorsson, S., Eliasson, I. (2007), Cooling rates, sky view factors and the development of intra-urban air temperature difference, Geografiska Annaler, Series A, Phys. Geo. 89, 237–248.Google Scholar
  25. Jospisil, J., Jicha, M., Niachou, A., and Santamouris, M. (2005), Computational Modelling of Airflow in Urban Street Canyon and Comparison with Measurements, Int. J. Environ. Pollut. 25, 191–200.Google Scholar
  26. Kovar-Panskus, A., Moulinneuf, L., Savory, E., Abdelqari, A., Sini, J-F., Rosant, J-M., Robins, A., Toy, N. (2002), A wind tunnel investigation of the influence of solar-induced wall-heating on the flow regime within a simulated urban street canyon, Water, Air, Soil Poll: Focus 2,555–571.Google Scholar
  27. Landsberg, H. E. (1981), The urban climate, Int. Geophys. 28, 127–135.Google Scholar
  28. Lee, D. O. (1975), Rural atmospheric stability and the intensity of the London’s heat island, Weather. 30, 102–109.Google Scholar
  29. Livada-Tselepidaki, I., Santamouris, M., and Dris, N. (1995), Human Thermal Discomfort conditions and heat island effect over Athens,Greece, Journée du Cuepé 1995. « Energie et Climat Urbain » Genève le 1er Decembre 1995. 37–41.Google Scholar
  30. Livada, I., Santamouris, M., Niachou, K., Papanikolaou, N., and Mihalakakou, G. (2002), Determination of Places in the great Athens area where the heat island effect is observed, Theoretical Appl. Climatol. 71, 219–230.Google Scholar
  31. Lyall, I. T. (1977), The London Heat - Island in June - July 1976, Weather. 32, 296–302.Google Scholar
  32. Mihalakakou, P., Flocas, H.A., Santamouris, M., and Helmis, C. G. (2002), Application of Neural Networks to the Simulation of the Heat Island over Athens, Greece, Using Synoptic Types as a Predictor, J. Appl. Meteorol. 41, 519–527.Google Scholar
  33. Mihalakakou, P., Santamouris, M., Papanikolaou, N., Cartalis, C. and Tsangrassoulis, A. (2004), Simulation of the Urban Heat Island phenomenon in Mediterranean climates, J. Pure Appl. Geophys. 161, 429–451.Google Scholar
  34. Niachou, S., Hassid, Santamouris, M., and Livada, I. (2005), Comparative monitoring of natural, hybrid and mechanical ventilation systems in urban canyons, Energy Build. 37, 503–513.Google Scholar
  35. Niachou, A., Livada, I., and Santamouris, M. (2008), Experimental Study of Temperature and Airflow Distribution inside an urban street canyon during hot summer weather conditions. Part 1. Air Surface Temp. Build. Environ. 43, 1383–1392.Google Scholar
  36. Niachou, A., Livada, I., and Santamouris, M. (2008), Experimental Study of Temperature and Airflow Distribution inside an urban street canyon during hot summer weather conditions. Part 2. Air Flow Anal. Build. Environ. 43, 1393–1403. Google Scholar
  37. Niachou, S., Hassid, Santamouris, M., and Livada, I. (2008), Experimental Performance Investigation of Natural, Mechanical and Hybrid Ventilation in Urban Environment, Build. Environ. 43, 1373–1382.Google Scholar
  38. Nichol, J. E. (1996), High-resolution surface temperature patterns related to urban morphology in a tropical city: A satellite-based study, J. Appl. Meteorol. 35, 135–146.Google Scholar
  39. Nicholson Sharon, E. (1975), A pollution model for street-level air, Atmos. Environ. 9, 19–31.Google Scholar
  40. Nunez, M. (1974), The energy balance of an urban canvas. Ph.D. Thesis, University of British Columbia, Vancouver.Google Scholar
  41. Nunez, M. and Oke, T. R. (1976), Longwave radiative flux divergence and nocturnal cooling of the urban atmosphere within urban canyon, Boundary Layer Meteorol. 10, 121–135.Google Scholar
  42. Offerle, B., Eliasson, I., Grimmond, C. S. B., and Holmer, B. (2007), Surface heating in relation to air temperature, wind and turbulence in an urban street canyon, Boundary Layer Meteorol. 122, 273–292.Google Scholar
  43. Offerle, B., Grimmond, C. S. B., Fortuniak, K., Kłysik, K., Oke, T. R. (2006), Temporal variations in heat fluxes over a central European city center, Theor. Appl. Climatol. 84, 103–116.Google Scholar
  44. Oke, T. R., and East, C. (1971), The Urban Boundary Layer in Montreal, Boundary Layer Meteorol. 1, 411–437.Google Scholar
  45. Oke, T. R. (1973), City size and the urban heat island. Atmos. Environ. 7, 769–779.Google Scholar
  46. Oke, T. R. (1981), Canyon geometry and the nocturnal urban heat island: comparison of scale model and field observations, Int. J. Climatol. 1, 237–254.Google Scholar
  47. Oke, T. R., Boundary Layer Climates (Methuen, London, New York 1987).Google Scholar
  48. Oke, T. R., Johnson, G. T., Steyn, D. G., and Watson, I. D. (1991), Simulation of Surface Urban Heat Islands under ‘Ideal’ Conditions at Night - Part 2: Diagnosis and Causation, Boundary Layer Meteorol. 56, 339–358.Google Scholar
  49. Papanikolaou, N., Livada, I., Santamouris, M., Νiachou, K. (2008), The Influence of Wind Speed on Heat Island Phenomenon in Athens, Greece, Int. J. Ventilation. 6, 4.Google Scholar
  50. Park, H. S. (1987), City size and urban heat island intensity for Japanese and Korean cities, Geogr. Rev. Japan, Sep. A. 60, 238–250.Google Scholar
  51. Runnalls, K., Oke, T. R. (1998), The urban heat island of Vancouver, BC. Second Urban Environment Symposium. American Meteorological Society: Albuquerque, NM.Google Scholar
  52. Sakakibara, Y. (1996), A numerical study of the effect of urban geometry upon the surface energy budget, Atmos. Environ. 30, 3, 487–496.Google Scholar
  53. Salmond, J. A., Oke, T. R., Grimmond, C. S. B., Roberts, S., Offerle, B. (2005), Venting of heat and carbon dioxide from urban canyons at night, J. Appl. Meteorol. 44, 1180–1194.Google Scholar
  54. Santamouris, M., Papanikolaou, N., Koronakis, I., Livada, I., Asimakopoulos, D. (1999), Thermal and Air Flow Characteristics in a Deep Pedestrian Canyon under Hot Weather Conditions, Atmos. Environ. 33, 4503–4521.Google Scholar
  55. Santamouris, M. (ed), Energy and Climate in the Urban Environment (James and James Science Publishers, London, 2001)Google Scholar
  56. Santamouris, M., Papanikolaou, N., Livada, I., Koronakis, I., Georgakis, C., Argiriou, A., and Assimakopoulos, D. N. (2001), On the Impact of Urban Climate to the Energy Consumption of Buildings, Solar Energy. 70, 3, 201–216.Google Scholar
  57. Santamouris, M. (2007), Heat Island Research in Europe, The State of the Art. J. Adv. Build. Energy Res. (Review Paper). 1, 123–150.Google Scholar
  58. Santamouris, M., Paraponiaris, K., and Mihalakakou, G., (2007), Estimating the Ecological Footprint of the Heat Island effect over Athens, Greece Climate Change. 80, 265–276.Google Scholar
  59. Santamouris, M., Georgakis, C., and Niachou, A., (2008), On the Estimation of Wind Speed in Urban Canyons for Ventilation Purposes. Part Two: Using of Data Driven Techniques to Calculate the More Probable Wind Speed in Urban Canyons for low ambient wind speeds, Build. Environ. 43, 8, 1411–1418.Google Scholar
  60. Schmauss, A. (1925), Eine miniaturepolarfront, Meteorol. Zeitschrift. 42, 196.Google Scholar
  61. Sini, J., Anquetin, S., Mestayer, P. (1996), Pollutant dispersion and thermal effects in urban street canyons. Atmos. Environ. 30, 2659–2677.Google Scholar
  62. Stathopoulou, E., Mihalakakou, P., Santamouris, M., and Bagiorgas, H.S. (2008), Impact of Temperature on Tropospheric Ozone Concentration Levels in Urban Environments, J. Earth Syst. Sci. 117, 3, 227–236.Google Scholar
  63. Synnefa, A., Santamouris, M., Livada, I. (2006), A study of the thermal performance of reflective coatings for the urban environment, Solar Energy. 80, 8, 968–981.Google Scholar
  64. Synnefa, A., Santamouris, M., and Apostolakis, K., (2007), On the development, optical properties and thermal performance of cool colored coatings for the urban environment, Solar Energy. 81, 488–497.Google Scholar
  65. Synnefa, A., Dandou, A., Santamouris, M., Tombrou, M., Soulakellis, N., (2008), Large Scale Albedo Changes using cool materials to Mitigate Heat Island in Athens, J. Appl. Met. In Press. Google Scholar
  66. Urnfield, J. (2003), Two decades of urban climate research: a review of turbulence, exchanges of energy and water, and the urban heat island, Int. J. Climatol. 23, 1–26.Google Scholar
  67. Vardoulakis, S., Fisher, E.A.B., Pericleous, K., Gonzalez-Flesca, N., (2003), Modeling air quality in street canyons: a review, Atmos. Environ. 37, 155–182.Google Scholar
  68. Watson, I. D., and Johnson, G. T. (1987), Graphical estimation of sky view-factors in urban environments, J. Climatol. 7, 193–197.Google Scholar
  69. WMO: Report of the Technical Conference on Tropical Urban Climates. WMO, Dhaka (1994).Google Scholar
  70. Yamashita, S., Sekine, K., Shoda, M., Yamashita, K., and Hara, Y. (1986), On relationships between heat island and sky view factor in the cities of Tama river basin, Japan, Atmos. Environ. 20, 4, 681–686. Google Scholar

Copyright information

© Birkhäuser / Springer Basel AG 2010

Authors and Affiliations

  • K. Giannopoulou
    • 1
    • 2
  • M. Santamouris
    • 1
  • I. Livada
    • 1
  • C. Georgakis
    • 1
  • Y. Caouris
    • 2
  1. 1.Group Building Environmental Research Studies, Department of PhysicsNational Kapodistrian University of AthensAthensGreece
  2. 2.Department of Mechanical Engineering and AeronauticsUniversity of PatrasPatrasGreece

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