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Advances in Atmospheric Sciences

, Volume 18, Issue 5, pp 831–843 | Cite as

The Influence of the Indian Ocean Dipole on Atmospheric Circulation and Climate

  • Li Chongyin
  • Mu Mingquan
Article

Abstract

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).

Key words

Indian Ocean dipole Sea surface temperature anomaly (SSTA) Asian summer monsoon Climate impact 

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Copyright information

© Advances in Atmospheric Sciences 2001

Authors and Affiliations

  • Li Chongyin
    • 1
  • Mu Mingquan
    • 1
  1. 1.LASG, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

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