摘要
利用常规气象观测资料和NECP/NCAR1°×1°再分析资料,对2012年12月5—6日山东黄渤海强风天气过程进行了天气动力学分析。结果表明:较强冷空气与地面气旋相互影响造成大的气压梯度是造成此次海上强风的直接原因。变压梯度使得强风爆发初期风速迅速加大。单站3h变压越大,变压梯度越大,风速的变化就越大。当地面盛行北风时,正变压梯度方向与风向一致,变压梯度对北风风速的增幅作用就越明显。中高层冷平流的补充下传作用和低层冷平流的扩散均对此次强风过程具有重要影响。
Based on the conventional observational data and NECP/NCAR I^X 1~ reanalysis data, a strong wind process happened over the Yellow and Bohai Seas on 5 and 6 December 2012 is analyzed. Results show that there were three phases： the large-scale baric gradient wind caused by cold air and surface cyclone led to the gale; the surface allobaric field and its gradient resulted in rapidly increased wind speed during the initial stage; the greater the 3-hour pressure change, the larger the allobaric gradient, the greater the change in wind speed. When the north wind prevailed, the positive gradient was consistent with wind direction, and the role of transforming speed growth was more obvious. The complement of high-level cold advection and the diffusion of lower downstream cold advection have important influence on the course of the strong wind process.
出处
《气象科技》
北大核心
2015年第2期283-288,共6页
Meteorological Science and Technology
基金
山东省气象局预报员专项"山东春季北大风关键预报技术研究"(sdyby2012-18)
公益性行业(气象)科研专项(GYHY201306034)资助
关键词
黄渤海强风
气压梯度
变压风
冷平流
strong wind process
pressure gradient
allobaric wind
cold temperature advection
作者简介
作者简介：韩永清，女，1986年生，硕士，工程师，主要从事天气预报技术和方法研究工作，E-mail：qingyonghan@163．com
