The Influence of the Indian Ocean Dipole on Atmospheric Circulation and Climate
The Influence of the Indian Ocean Dipole on Atmospheric Circulation and Climate
复制标题
DOI：
10.1007/bf03403506
复制
发表时间：
2001-09
影响因子：
5.8
通讯作者：
Chongyin Li;Mingquan Mu
中科院分区：
文献类型：
--
作者：
Chongyin Li;Mingquan Mu
本文研究了赤道印度洋海温的变化，特别是分析了它的偶极子振荡特征。9-11月偶极子振荡较强，1-4月偶极子振荡较弱，西部海温偏高、东部海温偏低为正位相，东部高海温、西部低海温为负位相。一般情况下，正相的幅度大于负相的幅度。偶极子也存在年际变化(4-5年周期)和年代际变化(25-30年周期)。分析还表明，印度洋偶极子对亚洲季风活动有重要影响，因为南亚对流层低层风场、对流层上层青藏高压和西北太平洋副热带高压都与印度洋偶极子有关。另一方面，印度洋偶极子仍然对北美和南印度洋地区(包括澳大利亚和南非)的大气环流和气候产生重大影响。
The SST variation in the equatorial Indian Ocean is studied with special interest in analyzing its dipole oscillation feature. The dipole oscillation appears to be stronger in September-November and weaker in January-April with higher SST in the west region and lower SST in the east region as the positive phase and higher SST in the east region and lower SST in the west region as the negative phase. Generally, the amplitude of the positive phase is larger than the negative phase. The interannual variation (4–5 year period) and the interdecadal variation (25-30 year period) also exist in the dipole. The analyses also showed the significant impact of the Indian Ocean dipole on the Asian monsoon activity, because the lower tropospheric wind fields over the Southern Asia, the Tibetan high in the upper troposphere and the subtropical high over the northwestern Pacific are all related to the Indian Ocean dipole. On the other, the Indian Ocean dipole still has significant impact on atmospheric circulation and climate in North America and the southern Indian Ocean region (including Australia and South Africa).