关键词: ARPS中尺度模式, 山谷风, 海陆风, 京津地区

Abstract: The non-hydrostatic mesoscale model ARPS 5.0IHOP5 was used to simulate the background wind field in the atmospheric boundary layer over Beijing-Tianjin area. As a comparison, the wind-field diagnostic analysis with observed meteorological data was used to generate hourly wind field in the lower atmosphere in August 2004. The results show that two mesoscale circulations affect this area, they are sea-land breeze and mountain-valley breeze. The mountain-valley breeze may influence the whole plain area, and the influence of sea-land breeze can reach as far as 100km approximately into the inland. Under the influence of these two circulations, the dominant wind is southerly from afternoon to midnight, and then changes to northerly till forenoon. During the period of switching from southerly to northerly, a belt of convergence occurs in the front of the western mountains in the model domain.

Key words: mesoscale model ARPS, mountain-valley breeze, sea-land breeze, Beijing-Tianjin area