一次典型的渤海北部偏北大风分析

利用2008年11月1目的高空、地面气象资料分析了辽宁省营口地区的渤海北部海面由西南风5级转偏北风7级的过程。结果表明：11月1日8：00地面的南高北低的形势场和较大的气压梯度配置是11月1日中午营口地区的渤海北部海面（团山测站）产生西南风5级、瞬时最大风速达13．9m／s的7级阵风的主要天气形势；11月1日傍晚营口地区处于地面冷锋东移南压过境冷平流冲击处，冲击带来的强烈大风以及气压梯度异常递增导致在20：00前后营口地区的渤海北部海面出现7级偏北大风；这是典型的渤海北大风个例。

A Typical Analysis of North Wind in the Northern Bohai Sea

The process of the southwest wind of 5th grade to the northern gale of 7th grade on November 1st,2008 in the Yingkou region of northern Bohai Sea were analyzed,based on the high-altitude and ground meteorological data.The main situation of causing the louder southwest wind,which the wind reaches 5th grade and the instantaneous gale reaches 7th grade which achieves 13.9 m/s(7th grade of the wind standard is 13.9-17.1 m/s),is the pattern of low in north and high in south of low-pressure gradient on the ground and the greater pressure gradient at 8:00 in Yingkou region of the northern Bohai Sea.The reason of the Yingkou region of northern Bohai Sea off the loud northern wind next to the night on the November 1st is the cold stratospheric impact on the ground by the cold front eastward shift of the South pressure and the abnormal increasing in the pressure gradient;It is a typical north wind case study of Bohai Sea.