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摘要
In this paper WRFV2. 2 mesoscale numerical model is used to simulate meteorological elements of different heights over Poyang Lake area within 200 km x 200 km range. We got the wind, temperature, humidity fields and the profile distribution of Poyang Lake area atmospheric boundary layer with the high-resolution of 1 km, from 00 : 00 Nov 5, 2009 to 12 : 00 Nov 6, 2009. The results show that: (1) The cool island effect exists between the lake-land during daytime accompanied by lake wind, and the heat island effect at night accompanied by land breeze, the maximum temperature difference between lake and land is up to 6 degrees C. (2) Meanwhile, the terrain and surface types on the Poyang Lake area has a great influence on the distribution of the wind, mainly there exists a southwest-to-northeast low-level convergence zone at night, which disappears during the day. (3) In addition, the role of wind and topography makes the lake's moisture distribution non-uniform. The humidity thickness becomes lower during the day while on the contrary at night. On the right of Poyang Lake the humidity value is greater than the left. The results relatively well reflect the distribution of meteorological elements within the boundary layer in Poyang Lake area, which can help us to understand the characteristics of regional climate, and the distribution of wind, temperature and humidity at different levels. It provides a scientific basis for the Poyang Lake area local weather forecast, wind energy resource development and environmental protection.
