大连金州地区海陆风及热内边界层研究

根据大连金州2009年常规气象站资料分析大连金州地区海陆风变化特征,并用MM5V3模式模拟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、冬季易形成海陆风;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1 000 m以上,伸向内陆距离可到18.9 km;热内边界层向内陆呈舌状分布,海岸边界层高度在700 m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1 000 m。

The Analysis of Sea-Land Breeze and Thermal Inner Boundary Layer in Dalian-Jinzhou

Based routine weather station data of windward and wind speed in 2007 to analyse sea-land breeze character in DaLian-Jinzhou.Using MM5V3 modle simulate wind field change character when sea-land breeze occurring and to calculate the distance of sea sea wind extending land and land wind extending sea.The results indicated that the appearance frequency of sea breeze and land breeze was obvious season change.Land breeze offen happening in winter,sea breeze was offen happening in summer and spring,sea-land breeze was happening in spring and autumn;The start time and end time of sea breaze is long in summer and short in winter,The start time and end time of land breaze is longer in autumn and winter than in summer;In modle sea-land breeze day sea breeze make humidity of land be large,the speed of sea breeze is larger than the speed of land breeze;Via numerical value modling of sea breeze,from creating to mature the thickness is about 1 000 meter,the distance of extending land is 18.9 kilometer.the thermal inner boundary layer assumes tongue figure,the thickness of thermal inner boundary layer is 700 meters the altitude of parabola is change higher by the distance of land is increasing.The highest altitude of thermal inner boundary layer is 1000 meters.