DENG Rui-jie,GONG Yuan-fa.Madden-Julian Oscillation's Inter-annual Variability and the Characteristics of its Major Modes over the Tropical Indian Ocean[J].Journal of Chengdu University of Information Technology,2016,(04):394-399.
热带印度洋低频振荡强度的年际变化及其主模态特征
- Title:
- Madden-Julian Oscillation's Inter-annual Variability and the Characteristics of its Major Modes over the Tropical Indian Ocean
- 文章编号:
- 2096-1618(2016)04-0394-06
- Keywords:
- meteorology; meteorology and climatology; tropical Indian ocean; Madden-Julian oscillation intensity; inter-annual variability; spatial major modes
- 分类号:
- P466
- 文献标志码:
- A
- 摘要:
- 为研究热带印度洋30～60 d低频振荡强度的年际变化特征,利用逐日向外长波辐射(简称OLR)资料,以低频振荡的能量作为低频振荡的强度指数,首先分析热带印度洋准30～60 d的低频振荡强度的季节变化特征,然后用EOF方法分析了各个季节准30～60 d振荡强度年际变化的空间主模态特征。结果表明:热带印度洋30～60 d低频振荡强度季节变化比较明显,其中春季最强,夏季和秋季相对较弱; 其活跃区的季节分布也有明显差异,反映出明显的年变化特征。4个季节强度的空间变化第一模态基本表现为一致的变化特征; 空间变化第二模态发现偶极子或三极子分布型。
- Abstract:
- In order to discuss the characteristics of Madden-Julian Oscillation's Inter-annual variability of 30-60 d over the Tropical Indian Ocean, the Madden-Julian oscillation energy as the Madden-Julian oscillation intensity index based on the outgoing long-wave radiation date, this study investigates the Madden-Julian oscillation of 30-60 d over the tropical Indian ocean and its characteristics of seasonal variation, then analyze the spatial major modes of each season's oscillation energy of 30-60 d by EOF. The results shows that the seasonal variation of 30-60 d's oscillation over the tropical Indian ocean varied obviously, and the oscillation energy is highest in Spring while it's relatively weak in summer and autumn. Each season has its different active area and reflect inter-annual variability obviously. Madden-Julian oscillation intensity's first mode has the similar characteristics in each season. The second mode raise triople or dipole.
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备注/Memo
收稿日期:2015-10-28 基金项目:国家自然科学基金资助项目(41275080); 公益性行业(气象)科研专项资助项目(GYHY201306022)