陕西暖季雷暴的主模态及其可能的影响机制
张宏芳1, 潘留杰2, 侯建忠2, 李明娟2

The Major Mode of the Shaanxi Thunderstorm and Possible Influence Mechanism
Zhang Hongfang1, Pan Liujie2, Hou Jianzhong2, Li Mingjuan2
图4 1960~2010年陕西雷暴EOF1和EOF2对应的时间序列的Morlet小波分析 （a）和b分别为EOF1全小波谱和局地小波功率谱；（c）和（d）分别为EOF2全小波谱和局地小波功率谱；（b）, d中闭合等值线表示通过了90%的置信度标准
Fig.4 The global wavelet spectra and local wavelet spectra for the principal components PC of warm season thunderstorm over Shaanxi province based on Morlet wavelet for the period 1960 to 2010 （a）and b are global wavelet spectra and local wavelet spectra for PC1； c and d are the same as a and b, but for PC2 the closed contour in b and d shows the reaching 90% of reliability standard