摘要
本文利用等熵位涡(IPV)理论对发生在高原北侧的新疆一次夏季降水过程做了诊断分析,着重讨论了与降水相联系的大气动力过程的结构。分析结果表明,随着天气系统的发展,该区等熵面北倾坡度增大,促使此处上升运动加强,引起降水强度变化。IPV高值区的正IPV平流对未来降水发生区域有一定指示意义。该区内边界层中摩擦作用使得地面影响系统主要呈高压脊。
In this paper, isentropic potential vorticity (IPV) theory is used to investigate a precipitation process in summer, which occured in Xinjiang of the Northern Qinghai-Xizang Plateau. The structure of atmospheric dynamic process associatted with precipitation is discussed. The results show that with the development of synoptic system, gradient of sloping to the north of isentropic surface in this region increassed, updraft enhanced here, so precipitation was influenced. The positive advection of IPV in IPV peak area make sense to forecast region in which it would be rain. The influencing system at surface mainly caused by frictional effects in planetary boundary layer frequently are high pressure ridges.
出处
《高原气象》
CSCD
北大核心
1992年第3期267-274,共8页
Plateau Meteorology
基金
国家自然科学基金
新疆维吾尔自治区自然科学基金联合资助
关键词
高原
降水
等熵位涡
分析
Isentropic potential vorticity (IPV)
Diagnostic analysis.
