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Variation of the coastal upwelling off South Java and their impact on local fishery resources

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Abstract

There is a vast upwelling area induced by the southeast monsoon in the waters off South Java, making the region an important fishing ground. Climate events can affect the variation of upwelling, but oceanographers have different understandings on the extent to which climate events control upwelling in this area, which leads to a lack of basis for studies on the evaluation and mechanisms of the variability of fishery resources in the region. The correlation between environmental parameters, including surface temperature (SST), chlorophyll-a (Chl-a) concentration, and climate event indices in South Java from 2003 to 2020 was analyzed. Results show that the Indian Ocean Dipole (IOD) has a greater influence on the interannual variability of upwelling intensity than ENSO. During the IOD, variations in equatorial latitudinal winds excite different types of Kelvin waves that anomalously deepen or shallow the thermocline, which is the main cause of anomalous variations in upwelling, independent of variations in the local wind field. A correlation between the interannual variability in upwelling and the annual catches was revealed, showing that climatic events indirectly affect fishery resources through upwelling effects. During positive IOD/El Niño periods, strong upwelling delivers more nutrients to the surface layer, which favors fish growth and reproduction, resulting in higher annual catches. A negative IOD/La Niña, on the other hand, leads to weaker upwelling and fewer nutrients into the surface waters. Fish tend to move in deeper waters, making traditional fishing methods less efficient and consequently lower annual catches.

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Data Availability Statement

Remote sensing data supporting the results of this study are available from the International Pacific Research Center (IPRC)/Asia Pacific Data Research Center (APDRC) and the corresponding open web site, detailed at Data Source. The fishery data in this paper are obtained from the publication ‘Statistics of Marine and Coastal Resources’ issued by the Indonesian National Bureau of Statistics.

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Acknowledgment

The author would like to thank the scientific research institutions mentioned in “Data sources” for providing data support to us, and would like to thank the editors and reviewers for their efforts.

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Correspondence to Zhenyan Wang.

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Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Nos. XDB42010203, XDA19060401) and the National Natural Science Foundation of China (Nos. 42176090, 41776011)

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Wen, C., Wang, Z., Wang, J. et al. Variation of the coastal upwelling off South Java and their impact on local fishery resources. J. Ocean. Limnol. 41, 1389–1404 (2023). https://doi.org/10.1007/s00343-022-2031-3

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  • DOI: https://doi.org/10.1007/s00343-022-2031-3

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