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| Interannual Variability of Sea Surface Temperature in the Northern Indian Ocean Associated with ENSO and IOD |
| WU Yan-Ling,DU Yan,ZHANG Yu-Hong,ZHENG Xiao-Tong |
| Graduate University of Chinese Academy of Science, Beijing 100049; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;Graduate University of Chinese Academy of Science, Beijing 100049; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;Ocean University of China, Qingdao 266100 |
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Abstract The Northern Indian Ocean (NIO) sea surface temperature (SST) warming, associated with the El Ni?o/Southern Oscillations (ENSO) and the Indian Ocean Dipole (IOD) mode, is investigated using the International Comprehensive Ocean-Atmosphere Data Set (ICOADS) monthly data for the period 1979?2010. Statistical analyses are used to identify respective contribution from ENSO and IOD. The results indicate that the first NIO SST warming in September?November is associated with an IOD event, while the second NIO SST warming in spring-summer following the mature phase of ENSO is associated with an ENSO event. In the year that IOD co-occurred with ENSO, NIO SST warms twice, rising in the ENSO developing year and decay year. Both shortwave radiation and latent heat flux contribute to the NIO SST variation. The change in shortwave radiation is due to the change in cloudiness. A cloud-SST feedback plays an important role in NIO SST warming. The latent heat flux is related to the change in monsoonal wind. In the first NIO warming, the SST anomaly is mainly due to the change in the latent heat flux. In the second NIO warming, both factors are important.
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Received: 27 March 2012
Revised: 09 May 2012
Accepted: 28 May 2012
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