Summer model
[water vapor mixing ratio]
* Color contour interval is different for each model
Summer_max : 9.3km
Summer_min : 3.1km
Summer_0: 2.5km
Result of Qvapor: The larger the mixing ratio, the larger the vertical scale.
[Temperature]
* Comparison upper atmosphere temperature with temperature 2 meters above surface
-
Temperature of surface (Timeseries.ncl)
In max, min models, two peaks appear in Timeseries in common. It is interpreted that two peaks occur as the temperature peak occurs twice due to convection within the heat island effect.
In 0 model, the second peak point does not appear (no peaks).
In our model, We only adjust the values of temperature and mixing ratio, so the variables of other heat island effects were same with practice data. In the three models, the first peak (meaning the beginning of the heat island phenomenon) is combined with other factors and the mixing ratio that we manipulated, resulting in a large heat island phenomenon. However, In the case of the second peak, it does not appear at 0 model, so we thought that the second peak was caused by the difference in the manipulated variable values.
That is, as the amount of water vapor in the atmosphere increases, it can be interpreted that the convection in the city due to the heat island effect (which cannot escape into savana) becomes stronger, and the second peak appears due to the rising airflow in the urban area.
-
TC – Upper Atmosphere
Where the gradient increases in the upper atmosphere of the city
: Local strong rise in the center of city causes severe temperature gradients between the city and the savanna boundary.
In the Timeseries.ncl results, the temperature rise in the surface and the atmosphere near the surface is confirmed by Tc. For example, in the case of the summer_max model, the first peak can be checked at 04: 30 ~ 06: 00, and the second peak at 08:30 through Tc.
Result of temperature: By analyzing Timeseries and Tc together, it is possible to confirm the rise and fall of large and small scales of heat island phenomenon in the city, especially in the center of city.
[U-wind]
The stronger the heat island phenomenon, the higher the rise airflow will reach, so the vertical scale is also increased. As a result, the u-wind appears larger and wider. It means the size of urban heat island phenomenon increases.
In the case of the Summer _max model, the u-wind shows phenomena extremely (at 04:30). This is because that the scale of urban heat island phenomenon itself was very large. It can be confirmed through the analysis of Qvapor and Tc results.
.png)
Summer_max(04:00)
.png)
Summer_min(04:00)
.png)
Summer_0(04:00)