贵州中部大气重力波活动的天气气候学分析

A SYNOPTIC CLIMATOLOGICAL ANALYSIS OF ATMOSPHERIC GRAVITY WAVES IN THE MIDDLE PART OF GUIZHOU

使用贵阳市１９９４年以来１６个月连续的大气重力波单测点探测资料及动态谱分析技术，对贵州中部大气重力波活动进行了天气气候学分析，结果表明：（１）大气重力波在冬春季明显强于夏秋季；（２）重力波日变化的特点是长周期波中午较强，短周期波午夜较强；（３）重力波谱分布特点是周期小于２０ｍｉｎ和１４０～１６０ｍｉｎ的波强度较小，周期在５０～６０ｍｉｎ和３２０ｍｉｎ以上的波强度较大；（４）相关分析结果表明，影响大气重力波强度的主要因子是冷空气活动和强对流活动；（５）大气潮汐产生的气压波动在长周期段上也有反映。

Using continuous data detected by single detector for 16 months since 1994 and the dynamic spectrum analysis method, a synoptic climatological analysis of activities of atmospheric gravity waves(AGWs) in the middle part of Guizhou province were made. The results show: (1) AGWs in winter-spring are stronger than that in summer-autumn obviously; (2) The characteristic of diurnal variation of AGWs is that the waves with longer periods are stronger in midday and the waves with shorter periods are stronger in midnight;(3) The characteristics of distribution of AGWs spectra are that the strength of waves with periods 140～160min and shorter than 20min are weaker, the strength of waves with periods 50～60 min and longer than 320min are stronger; (4) The main factors which influence on strength of AGWs are activities of cold air and severe convections; (5) The pressure waves produced by atmospheric tide are also reflected in the long period spectrum band of AGWs.