辽宁葫芦岛地区海陆风及热内边界层研究

摘要

Based on routine weather station data of windward and wind speed in 2007, we analyzed sea-land breeze character at Huludao. Using MM5v3 model, we simulated wind field change character when sea-land breeze occurring and calculated the distance of sea wind extending into the land and land wind extending ton the sea. The appearance frequencies of sea breeze and land breeze were obvious of seasonly change. Land breeze happened in winter, sea breeze happened in summer and spring, and sea-land breeze happened in spring and autumn. The dura- tion of sea breaze was long in summer and short in winter; The duration of land breaze was longer in autumn and winter than in summer; In a characteristc sea-land breeze day, sea breeze greatly increase the humidity on land, and the speed of sea breeze was larger than the speed of land breeze. Via numerical value modeling of sea breeze, from initiation to matureness the thickness was about 2 000 m, the distance of extension into land was 40 km. The thermal inner boundary layer assumed a tongue-like figure, the thickness of thermal inner boundary layer was 200- 300 m. The altitude of parabola was increased as the distance of land was increased. The highest altitude of thermal inner boundary layer was 1 800 meters.%根据2007年辽宁葫芦岛气象站资料分析了葫芦岛地区海陆风变化特征，并用MM5v3模式模拟了典型日的海陆风风场变化和热内边界层位温场结构变化。结果表明：海风和陆风出现的频率有明显的季节性变化。冬季陆风较多，春夏海风较多，春季、秋季易形成海陆风；海风起止时间夏季长冬季短，陆风起止时间秋冬季较夏季长；典型海陆风日中，海风造成陆地湿度变大，海风风速大于陆风风速；通过海风的数值模拟，海风由生成到成熟海岸吹向内陆其厚度可增厚到2000m以上，伸向内陆距离可到40km；热内边界层向内陆呈舌状分布，海岸边界层高度在200～300m之间，抛物面高度随着向内陆延伸的距离增加而升高。热内边界层最高达1800m。