大气波导的天气形势分析.doc

文档介绍：青岛海域大气波导的天气形势分析
摘要
本文首先回顾了大气波导的定义、分类、形成机制的相关知识。以青岛海域为研究区域,利用青岛气象观测站探空资料,确定该海域在2007年的所有大气波导事件。根据大气波导事件所对应的FNL再分析数据,运用经验正交函数(EOF)分析方法探究大气波导发生的主要天气形势。通过仔细分析FNL再分析数据1000,850,700hPa高度和温度场的EOF分解结果发现:(1)冬季冷空气的活动导致低层冷平流较高层强出现逆温;春夏季青岛位于高低压之间,偏向低压并且有暖平流;夏季青岛位于高低压之间,靠近高压而且有暖平流易于发生大气波导。(2)2007年青岛海域发生的大气波导的类型多为抬升波导。
关键词:青岛海域,大气波导,EOF分析,天气形势
The aAnalysis of the weather Weather situation Situation on dDucts in over Qingdao RegionSeawaters
Abstract
In this paper, first, we reviewed the knowledge of the definition, classification and formation mechanism on of atmospheric duct is firstly reviewed. The sea around Qingdao as the study area, the Ssounding data observations of Qingdao station is used to determine the all duct events occurred in 2007. from the meteorological station of Qingdao. According to the FNL reanalyis data data which was analyzed again in corresponding with the time of the determined duct eventsabove, analysis of method of the Empirical Orthogonal Function (EOF) method is used to explore the main weather situation when duct occurred. The results after EOF analysis position about t the height and temperature fields on 700, 850 and 1000hPa of the data of FNL reanalysis are carefully analyzedconducted, the results can be outlined as:we find that: (1) tThe activities of cold air in winter lead to cold advection at low level stronger than that at high level, which results in and the inversion is occurred in atmospheric layer. In spring and summer, , Qingdao region sea locates between low and high pressure systems , and it is ’s nearer to the former that causes low pressure center and there is warm advection in spring and summer. In summer, , Qingdao locates between low and high pressure systems, and it is it’s nearer to the latterhigh pressure center that causes and there is warm advection in summer. (2) uplift atmospheric duct is the dominant type over Qingdao region sea in 2007.
most of all types of atmospheric duct occurred at Qingdao waters in 2007.
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