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<p>This study employs a blend of satellite and reanalysis data to investigate fluctuations in Chlorophyll-a (Chl-a) concentrations in the vicinity of the Sulu Sea. The dataset covers the 25-year period from 1998 to 2022. The seasonal fluctuations in the Sulu Sea indicate that Chl-a concentrations reach their peak during the months of December, January, and February (DJF). Moreover, the primary factor influencing the interannual variations in Chl-a concentrations during the DJF is the occurrence of ENSO events. Specifically, Chl-a concentrations will increase during El Niño events and drop during La Niña events. The highest peak in Chl-a concentrations occurred during the El Niño period of 2015/2016, whilst the lowest concentrations were seen during the La Niña period of 2020/2021. In addition to the northeasterly wind, which undergoes a strengthening (weakening) pattern during El Niño (La Niña), the annual fluctuation of Chl-a concentrations is also influenced by the propagation of the Rossby wave from the central Pacific to the western Pacific. Also, we found that the mechanisms responsible for the increase in Chl-a concentrations in the Sulu archipelago and the western coast of Mindanao were distinct for each region.</p>

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An Analysis of the Fluctuation in Chlorophyll-a Concentration in the Sulu Sea During a 25-Year Period

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Yusuf Jati Wijaya,
  • Ulung Jantama Wisha,
  • Lilik Maslukah,
  • Imma Redha Nugraheni,
  • Seto Windarto,
  • Bayu Munandar,
  • Muhammad Zainuri

摘要

This study employs a blend of satellite and reanalysis data to investigate fluctuations in Chlorophyll-a (Chl-a) concentrations in the vicinity of the Sulu Sea. The dataset covers the 25-year period from 1998 to 2022. The seasonal fluctuations in the Sulu Sea indicate that Chl-a concentrations reach their peak during the months of December, January, and February (DJF). Moreover, the primary factor influencing the interannual variations in Chl-a concentrations during the DJF is the occurrence of ENSO events. Specifically, Chl-a concentrations will increase during El Niño events and drop during La Niña events. The highest peak in Chl-a concentrations occurred during the El Niño period of 2015/2016, whilst the lowest concentrations were seen during the La Niña period of 2020/2021. In addition to the northeasterly wind, which undergoes a strengthening (weakening) pattern during El Niño (La Niña), the annual fluctuation of Chl-a concentrations is also influenced by the propagation of the Rossby wave from the central Pacific to the western Pacific. Also, we found that the mechanisms responsible for the increase in Chl-a concentrations in the Sulu archipelago and the western coast of Mindanao were distinct for each region.