Abstract
The spatiotemporal structure and evolution of the thermally-induced mountain-plain breeze circulation in the Longquan Mountain, eastern Chengdu, are studied by the WRF-ARW model based on a two-day case. Turbulence characteristics are also examined to better understand the local circulation of the area. Simulation results show that the 2 m temperature distribution of the plain and mountain areas is peculiar due to the occurrence of the temperature inversion. The plain and mountain breezes can be predicted explicitly by the model, and the consequent circulations are coupled with other factors such as turbulent movement and vertically propagating mountain waves. Owing to this unique terrain feature, the north portion of the mountain demonstrates more evident mountain and plain breezes compared to the south and middle portions. Stronger turbulences are formed over the mountain area compared to the plain area. Vertical cross-sections of turbulent heat, moisture and momentum fluxes show that turbulent transport plays an important role in the development and elimination of mountain-plain breeze circulation.
Highlights
Mountain wind system occurs at mountainous regions and has a great effect on regional climate, weather, environment and natural resources [1,2,3,4,5]
The characteristics and evolution of the mountain-plain breeze circulation in the Longquan Mountain, eastern Chengdu are studied by means of a three-dimensional high-resolution WRF (V3.9) numerical simulation under a clear-sky and weak-gradient condition
Due to the terrain difference among different portions of the Longquan Mountain, the characteristics and evolution of the mountain-plain breeze circulations are different in various locations
Summary
Mountain wind system occurs at mountainous regions and has a great effect on regional climate, weather, environment and natural resources [1,2,3,4,5] It comprises of slope breeze, valley breeze and mountain-plain breeze, which all experience wind direction changes twice a day under weak synoptic forcing, and clear-sky conditions [6,7,8,9]. In these topographic conditions, the characteristics of the mountain-plain breeze circulation of the Longquan Mountain remain unclear. Numerical simulation results of meteorological elements and turbulence characteristics around the Longquan Mountain are explained in detail in this paper
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