【摘要】 利用天津新一代天气雷达探测到的2008年6~9月共56次渤海湾海风锋天气过程资料、255m高的气象铁塔资料及相应的自动气象站资料,统计分析了渤海湾海风锋的气候特征,包括渤海湾海风锋出现的时间、频率和海风锋触发形成雷暴天气的演变特征。结果表明,2008年6~9月雷达共观测到渤海湾海风锋56次;每日海风锋的形成时间有所不同,最早形成时间是09:30(北京时,下同),最晚在16:00;维持时间也各有长短,最长维持时间为6.5 h,最短的仅1 h;伸展到内陆的一般距离为70~80 km,最远距离达120 km,高度一般为1.5 km,最高为2.0 km。同时,结合2002-2007年典型的海风锋天气个例分析表明,单一海风锋由于水平范围小,垂直厚度最高为2 km,一般不能形成雷暴天气。但是,当它与西边很弱的冷锋形成一定角度(30°~90°)碰撞时,在碰撞的交叉处能够形成雷暴天气;当海风锋与其它系统呈追赶碰撞时,一般不能形成雷暴天气;当海风锋与其它系统平行碰撞时,有时雷暴加强,有时雷暴减弱。更多还原

【Abstract】 The 56 times sea breeze fronts were detected in Bohai bay from June to September of 2008 based on Doppler data.Using the previous data,the meteorological tower of 255 m height and AWS,the climate features of sea breeze front have been analyzed statistically,including its initial time,frequency and the evolution of thunderstorm triggered by sea breeze front.The result shows that the last time of sea breeze front differs from one day to another day,including 6.5 h of the longest time and just 1 h of the shortest time.The initiation of thunderstorm has closely related to sea breeze front in intersection.Those play an important role initiation of thunderstorms for nowcast.更多还原