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Influence of positive and negative Indian Ocean Dipoles on ENSO via the Indonesian Throughflow: Results from sensitivity experiments

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Abstract

The role of the Indonesian Throughflow (ITF) in the influence of the Indian Ocean Dipole (IOD) on ENSO is investigated using version 2 of the Parallel Ocean Program (POP2) ocean general circulation model. We demonstrate the results through sensitivity experiments on both positive and negative IOD events from observations and coupled general circulation model simulations. By shutting down the atmospheric bridge while maintaining the tropical oceanic channel, the IOD forcing is shown to influence the ENSO event in the following year, and the role of the ITF is emphasized. During positive IOD events, negative sea surface height anomalies (SSHAs) occur in the eastern Indian Ocean, indicating the existence of upwelling. These upwelling anomalies pass through the Indonesian seas and enter the western tropical Pacific, resulting in cold anomalies there. These cold temperature anomalies further propagate to the eastern equatorial Pacific, and ultimately induce a La Niña-like mode in the following year. In contrast, during negative IOD events, positive SSHAs are established in the eastern Indian Ocean, leading to downwelling anomalies that can also propagate into the subsurface of the western Pacific Ocean and travel further eastward. These downwelling anomalies induce negative ITF transport anomalies, and an El Niño-like mode in the tropical eastern Pacific Ocean that persists into the following year. The effects of negative and positive IOD events on ENSO via the ITF are symmetric. Finally, we also estimate the contribution of IOD forcing in explaining the Pacific variability associated with ENSO via ITF.

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Authors and Affiliations

  1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

    Qian Zhou, Wansuo Duan & Rong Feng

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Qian Zhou

  3. Key Laboratory of Ocean Circulation and Wave, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Mu Mu

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  1. Qian Zhou
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  2. Wansuo Duan
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  3. Mu Mu
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  4. Rong Feng
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Correspondence to Wansuo Duan.

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Zhou, Q., Duan, W., Mu, M. et al. Influence of positive and negative Indian Ocean Dipoles on ENSO via the Indonesian Throughflow: Results from sensitivity experiments. Adv. Atmos. Sci. 32, 783–793 (2015). https://doi.org/10.1007/s00376-014-4141-0

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  • DOI: https://doi.org/10.1007/s00376-014-4141-0

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