The station N°.1 is an open space with asphalt soil, oriented North-South. Open streets are more exposed to air
movement and long wave radiation loss than narrow streets [7]. The energy balance (Rn) and latent heat flow (LvE)
are significantly higher than the conductive heat flow (G) and sensible heat flow (H) during the measurement period,
the peak of the energy balance recorded at first day 720W/m2 at 02h00 (Figure 4), this is due to the total absence of
any source of refreshment or shading, and the important sunshine duration and the importance asphalt surface
exposed to the direct sunlight, generate a large storage of heat during the day and its return at night, which
contributes significantly to overheating air of a summer night. It is possible to note that the sensible heat flow (H) is
never negative during the night from 20h00 until 06h00, suggesting that the release of heat storage from night is
sufficient to maintain a positive flow. The difference between the sensible heat flow (H) and energy balance (Rn)
also plainly visible the starting time of the release of the energy stored during the day. The delay about six hours
between the peaks of (H at 22h00 equal to 60W/m2) and (Rn at 04h00 equal to 720W/m2) indicates a daily
asymmetry in both graphs.
The station N°.1 is an open space with asphalt soil, oriented North-South. Open streets are more exposed to air
movement and long wave radiation loss than narrow streets [7]. The energy balance (Rn) and latent heat flow (LvE)
are significantly higher than the conductive heat flow (G) and sensible heat flow (H) during the measurement period,
the peak of the energy balance recorded at first day 720W/m2 at 02h00 (Figure 4), this is due to the total absence of
any source of refreshment or shading, and the important sunshine duration and the importance asphalt surface
exposed to the direct sunlight, generate a large storage of heat during the day and its return at night, which
contributes significantly to overheating air of a summer night. It is possible to note that the sensible heat flow (H) is
never negative during the night from 20h00 until 06h00, suggesting that the release of heat storage from night is
sufficient to maintain a positive flow. The difference between the sensible heat flow (H) and energy balance (Rn)
also plainly visible the starting time of the release of the energy stored during the day. The delay about six hours
between the peaks of (H at 22h00 equal to 60W/m2) and (Rn at 04h00 equal to 720W/m2) indicates a daily
asymmetry in both graphs.
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