The Strong Downwelling (Upwelling) Impact on Small Pelagic Fish Production During the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Jonson Lumban-Gaol; Eko Siswanto; Nyoman Metta N. Natih; I Wayan Nurjaya; Mochammad Tri Hartanto; Erwin Maulana; Lucky Adrianto; Kedarnath Mahapatra; Herlambang Aulia Rachman; Takahiro Osawa; Arik Permana

doi:10.20944/preprints202011.0071.v1

A peer-reviewed article of this Preprint also exists.

Lumban-Gaol, J.; Siswanto, E.; Mahapatra, K.; Natih, N. M. N.; Nurjaya, I. W.; Hartanto, M. T.; Maulana, E.; Adrianto, L.; Rachman, H. A.; Osawa, T.; et al. Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java. Climate, 2021, 9, 29. https://doi.org/10.3390/cli9020029. Lumban-Gaol, J.; Siswanto, E.; Mahapatra, K.; Natih, N. M. N.; Nurjaya, I. W.; Hartanto, M. T.; Maulana, E.; Adrianto, L.; Rachman, H. A.; Osawa, T.; et al. Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java. Climate, 2021, 9, 29. https://doi.org/10.3390/cli9020029.

Abstract

Although researchers have investigated widely the impact of IOD phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) of IOD on a chlorophyll a (Chl-a) concentration as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increasing) of small pelagic fish production in the EIO off Java.

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The Strong Downwelling (Upwelling) Impact on Small Pelagic Fish Production During the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Abstract

Keywords

Subject

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