Abstract
With the past rapid economic development and large population growth, Jing-Jin-Ji District has been undergoing rapid urbanization, which has caused considerable regional weather changes in local regions. In this paper, we used the Weather Research and Forecasting (WRF) model to quantitatively analyze the effects of past urbanization and potential future urbanization on the regional weather in the center of Jing-Jin-Ji District. The hydrometeorological data from two weeks in July 2019 were used to simulate the influence of urbanization on local weather in the Jing-Jin-Ji District at regional scales using a single-layer canopy parameterization scheme. To better quantify the differences in temperature and precipitation induced by urbanization, three simulation scenarios were designed, which were no urban cover (NU), current urbanization cover (CU), and full urban land cover (FU), respectively. The results showed that: (1) Urbanization progress (from NU to CU and from CU to FU) in Jing-Jin-Ji District increased the daytime temperature, night temperature, and temperature difference between day and night, while decreasing the total rainfall and peak rainfall. (2) Compared with NU, the mean temperature of the CU and FU increased 0.3 K and 0.6 K, respectively, and the mean precipitation of CU and FU decreased by approximately 6% and 8.4%, respectively. (3) The main influence of urbanization on weather was reflected by the maximum temperature and peak rainfall, while the other impacts were relatively insignificant. (4) Compared with NU, the maximum temperature of CU and FU increased 0.82 K and 1.35 K, respectively, and the peak rainfall of NU and FU decreased by approximately 9.5% and 19.0%, respectively; The results of this study bring to light the urban management strategies for policy makers.
Highlights
Urbanization refers to the process in which the original, natural land surface is replaced by an artificial surface
Compared with no urban cover (NU), the mean precipitation of CU and full urban land cover (FU) decreased by approximately 6% and 8.4%, respectively
The Weather Research and Forecasting (WRF) model was used to simulate the urbanization impacts on local weather using three scenarios in Jing-Jin-Ji District
Summary
Urbanization refers to the process in which the original, natural land surface is replaced by an artificial surface. Many studies have reported on the effects of urbanization, including urban climate [1,2], urban heat islands [3,4,5,6,7,8,9], contributions of urban environments to global warming [10], changes in precipitation [2,11,12], and reductions of air moisture and evaporation in cities [13]. They estimated that the mean surface warming per century due to land-use changes was 0.27 ◦ C Another important issue that has been widely studied is how urbanization changes the distribution of precipitation.
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