Russian Federation
Russian Federation
Russian Federation
UDC 550.361.4
UDC 551.524.31
UDC 55
UDC 550.34
UDC 550.383
CSCSTI 37.31
CSCSTI 37.23
CSCSTI 37.01
CSCSTI 37.15
CSCSTI 37.25
CSCSTI 38.01
CSCSTI 36.00
CSCSTI 37.00
CSCSTI 38.00
CSCSTI 39.00
CSCSTI 52.00
Russian Classification of Professions by Education 05.06.01
Russian Library and Bibliographic Classification 26
Russian Trade and Bibliographic Classification 63
BISAC SCI SCIENCE
In most cities in the world, the daytime maximum of the urban heat island (UHI) intensity is observed after sunset. It is minimal around noon. We propose a new mechanism for the formation of the UHI intensity’s diurnal cycle that considers the phase shift between surface temperature variations in the city and surroundings. This phase shift occurs due to the difference in thermophysical structure of the subsurface in urban and rural areas. In the case of a homogeneous medium, the temperature maximum at the surface is observed π/4 later than the heat flux maximum at solar noon. With the presence of an upper layer having a low thermal conductivity compared to the underlying layers, the phase shift would be less than π/4. Such conditions are often observed in rural areas. The delay of the temperature variations in the city relative to those in the countryside leads to an even greater delay in the UHI intensity relative to the heat flux. This is probably the main reason for the UHI intensity’s diurnal variations being observed. The proposed mechanism was verified through the data obtained at weather stations in Yekaterinburg and its surroundings.
urban heat island intensity, diurnal cycle, ground surface heat flux, ground surface temperature, solar radiation, thermal effusivity, thermal inertia
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