【摘要】 在渤海,中尺度模式预报的风速通常比实际风速低得多.利用1990—2001年渤海不同观测站的风场、温度场资料,按季节、风向对海、陆风速统计分析,得到海陆风速的对比值,同时对造成海陆风速差异的原因进行动力、热力等分析.结果表明:海、陆风速在不同的天气系统以及动力和热力方面都存在明显差异.据此渤海风速场推算模式进行了改进,既考虑动力摩擦的作用,也考虑热力差异引起的海陆风增幅作用,改进的渤海风场推算模式有了很大的提高.因此,应用改进后的渤海风速场推算模式,对中尺度数值预报的风速场进行订正,使预报的风速明显提高,更加接近实际情况.更多还原

【Abstract】 In the Bohai Sea,the wind speed forecasted by meso-scale system model is usually lower than the real one.Using the data of wind fields and temperature fields from 1990 to 2001 at Platform A,Tanggu,Long Islands and Dalian,in this article,the wind speeds on both the land and the sea in different seasons and wind directions are analyzed.Also,the reason of differences between sea wind and land surface wind is analyzed at dynamical and thermodynamic aspects.The result shows that wind speed has different value at different synoptic system and different dynamical and thermodynamic conditions.The model for calculating wind-peed presented by Xin Baoheng is improved,the dynamic friction effect and thermodynamic contrast effect on reinforcement of land and sea wind are considered,and then an improved model is gained.Thus,a new model for calculating Bohai Sea wind speed is put forward,which improves the forecast ability of meso-scale system forecast.更多还原