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Influence of the Indonesian Throughflow on the upwelling off the east coast of South Java

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  • Oceanology
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Chinese Science Bulletin

Abstract

A wave–tide–circulation coupled model is used to simulate upwelling off the south coast of Java, Indonesia. The results show that the vertical velocity off East Java is stronger than other parts in this area. The strongest vertical velocity is located approximately at 80 m depth. The annual averaged values of upwelling are 2.3 × 10−6 and 1.06 × 10−5 m/s for south of West Java and south of East Java, respectively. The vertical velocity from the model shows that upwelling off West Java has seasonal variability, while it is quite steady and strong off East Java. Additional numerical experiments show that the wind is not the dominant factor for the steady upwelling off the southern part of East Java. It is then hypothesized that the Indonesian Throughflow (ITF) may be responsible for the upwelling. To test this hypothesis, two scenarios are implemented, both of which block the outflow of the ITF. Sensitive study shows that the ITF plays a key role in the formation of East Java upwelling. The effect of the ITF can account for about 55 %–65 % of the upwelling.

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Acknowledgments

Rita Tisiana Dwi Kuswardani was supported by the China Scholarship Council during her stay at the Ocean University of China and the First Institute of Oceanography, SOA, China, during 2009–2012. The work is supported by the National Basic Research Program (973 program) of China (2010CB950300).

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The authors declare that they have no conflict of interest.

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Correspondence to Fangli Qiao.

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Kuswardani, R.T.D., Qiao, F. Influence of the Indonesian Throughflow on the upwelling off the east coast of South Java. Chin. Sci. Bull. 59, 4516–4523 (2014). https://doi.org/10.1007/s11434-014-0549-2

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  • DOI: https://doi.org/10.1007/s11434-014-0549-2

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