Journal of Ocean University of China

, Volume 12, Issue 2, pp 245–252 | Cite as

The role of barrier layer in southeastern Arabian Sea during the development of positive Indian Ocean Dipole events



Using data from Argo and simple ocean data assimilation (SODA), the role of the barrier layer (BL) in the southeastern Arabian Sea (SEAS: 60°E–75°E, 0°–10°N) is investigated during the development of positive Indian Ocean Dipole (IOD) events from 1960 to 2008. It is found that warmer sea surface temperature (SST) in the northern Indian Ocean appears in June in the SEAS. This warm SST accompanying anomalous southeastern wind persists for six months and a thicker BL and a corresponding thinner mixed layer in the SEAS contribute to the SST warming during the IOD formation period. The excessive precipitation during this period helps to form a thicker BL and a thinner mixed layer, resulting in a higher SST in the SEAS. Warm SST in the SEAS and cold SST to the southeast of the SEAS intensify the southeasterly anomaly in the tropical Indian Ocean, which transports more moisture to the SEAS, and then induces more precipitation there. The ocean-atmosphere interaction process among wind, precipitation, BL and SST is very important for the anomalous warming in the SEAS during the development of positive IOD events.

Key words

sea surface temperature (SST) mixed layer barrier layer Indian Ocean Dipole (IOD) persistence precipitation southeastern Arabian Sea 


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Copyright information

© Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Feiyan Guo
    • 1
  • Qinyu Liu
    • 1
  • Xiao-Tong Zheng
    • 1
  • Shan Sun
    • 2
  1. 1.Physical Oceanography Laboratory and Key Laboratory of Ocean-Atmosphere Interaction and Climate in Universities of ShandongOcean University of ChinaQingdaoP. R. China
  2. 2.NOAA Earth System Research LaboratoryBoulderUSA

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