平流层Brunt-Vaisala频率的分布特征  

Distribution of Brunt-Vaisala Frequency in the Stratosphere

作　　者：陈权亮[1] 陈月娟[1] 邓淑梅[1] 

机构地区：[1]中国科学技术大学地球与空间科学学院,安徽合肥230026

出　　处：《中国科学技术大学学报》2005年第6期909-918,共10页JUSTC

基　　金：国家自然科学基金资助项目(40375012).

摘　　要：讨论了Brunt-Vaisala频率的重要性,并利用NCEP/NCAR再分析资料和HALOE资料分析了平流层中它的空间分布和时间变化特征.结果表明:从对流层到平流层Brunt-Vaisala频率在垂直方向上有明显的变化,特别是在低纬度地区,它在对流层向上迅速增加,在平流层向上减小;在平流层下层,它随着纬度的增加而减小,在平流层则经向分布比较均匀;在陆地上空Brunt-Vaisala频率的垂直梯度明显大于海洋上空,且出现高值中心;无论在对流层还是在平流层,Brunt-Vaisala频率冬季的值皆大于夏季的值;该频率也有准两年周期的变化.作为一个例子,我们运用实际计算出的Brunt-Vaisala频率对行星波垂直传播的影响进行了初步的讨论.The importance of Brunt-Vaisala frequency is discussed and NCEP/NCAR reanalysis data and HALOE data are used to analyze its distribution and variation in the stratosphere. The results show that grunt-Vaisala Frequency changed with height obviously. Especially in low latitudes, its value increased quickly with altitude in the troposphere, decreased with latitude in stratosphere; It decreased with latitude in lower Stratosphere, while its meridional distribution is relatively homogeneous in upper stratosphere; the vertical gradient of the Brunt-Vaisala frequency over continents is greater than over oceans and there are high centers over the continents; Brunt-Vaisala frequency in winter is larger than in summer. Besides this, Brunt-Vaisala frequency appears to quasi-biennial oscillation over tropical areas. As an example, we use those calculated results of Brunt-Vaisala frequency to discuss its effect on the vertical propagation of the planetary wave.

关 键 词：Brunt-Vaisala频率 空间结构 行星波垂直传播 

分 类 号：P421[天文地球—大气科学及气象学]