【摘要】 用区域边界层模式RBLM模拟北京地区气象环境特征。数值模拟结果表明 :(1 )北京地区的气象环境很复杂 ,其主要特点是受昼夜循环的山谷风气流、城市热岛环流以及大尺度系统共同影响。 (2 )北京市区冬季地面风的日变化较小 ,主要是偏北气流 ,城市上游方向在市区的北边 ,而春夏季地面风的日变化比较明显 ,市区的进出口气流方向变化很大。 (3 )北京市城市热岛强度在夏季较强 ,城市热岛环流明显 ,城市中心近地面气温比郊区近地面气温高 5～ 6℃左右。 (4)数值模拟结果能较好地反映北京地区流场的日变化 ,与实际观测结果吻合较好更多还原

【Abstract】 The Regional Boundary Layer Model (RBLM) is used to simulate the meteorological environmental characteristics over the Beijing area. The results show: (1) The meteorological environment over the Beijing area is complex, which is controlled mainly by the combined influence of the mountain valley wind circulation cycling day and night, the urban heat island circulation, and large scale system. (2) In winter the daily variation of surface wind is small and the near north air stream dominates, and the upstream is in the south;however, in summer and spring the daily variations of the surface wind are more obvious, and the direction of in and out air stream varies frequently. (3) In summer, the intensity of the urban heat island effect is greater; the urban heat island circulation is more evident; and the surface temperature in the central Beijng is 5-6 ℃ greater than that in the suburbs. (4) The result of simulation can reflect well the daily variation of the fluid field and is in well accordance with the observation.更多还原