BRIN Detects Early Upwelling Signals in Southern Indonesia

BRIN Detects Early Upwelling Signals in Southern Indonesia

BRIN Detects Early Upwelling Signals in Southern - On June 10, 2026,

“In the currents, there are nutrients such as phosphate, nitrate, silicate, and dissolved iron,”

said Widodo Setiyo Pranowo, a senior researcher at the Climate and Atmosphere Research Center of the National Research and Innovation Agency (BRIN). The expert highlighted that early signs of upwelling have already begun to appear in the southern waters of Indonesia, a phenomenon that could significantly influence marine ecosystems and fisheries. According to BRIN, this process involves the movement of deep-sea water to the surface, which often enhances productivity and resource availability for aquatic life.

Regional Upwelling Patterns and Intensity

BRIN’s oceanographic forecasts, based on data from June 1 to July 7, 2026, indicate that upwelling is occurring in several Indonesian waters. These regions include the southern Java Sea, the Bali area, Nusa Tenggara, the Sawu Sea, and the Timor Sea. The intensity of the upwelling varies, ranging from weak to moderate, and the distribution of these signals is not yet uniform across the affected zones. This suggests that the process is still in its early stages and may evolve as the season progresses.

Widodo explained that the detection of upwelling relies on a combination of global climate models, satellite imagery, and direct measurements from robotic autonomous floats deployed in the Indian and Pacific Oceans. These devices gather real-time data on ocean conditions, which is then analyzed alongside regional tide gauge stations positioned along the coasts of various countries. This multi-source approach ensures a comprehensive understanding of the phenomenon, even in remote areas.

Scientific Insights on Upwelling Dynamics

Upwelling, as described by Widodo, is characterized by vertical ocean currents that lift nutrient-rich water from deeper layers to the surface. This movement brings cooler water masses into the upper layers of the sea, which are exposed to sunlight and atmospheric conditions. The nutrient influx, including essential elements like phosphate, nitrate, silicate, and dissolved iron, plays a vital role in stimulating biological activity within the marine environment.

“The fishing industry, including fishermen, potentially benefit first from upwelling,”

he added. “This is because the nutrients support the growth of phytoplankton, which forms the base of the marine food chain.”

Phytoplankton utilize these nutrients to produce more biomass, aided by solar energy. As these microscopic organisms proliferate, they provide sustenance for zooplankton, which in turn feed smaller fish. This cascading effect eventually supports larger fish species, creating a ripple of ecological and economic benefits for coastal communities.

Risks and Projections

While upwelling offers advantages, it also presents potential challenges. Widodo warned that if the process accelerates, it could lead to the rapid growth of toxic phytoplankton, which may harm fish populations and disrupt marine ecosystems. He noted that the initial upwelling activity is within the expected timeframe, with the peak typically occurring between July and August. However, the presence of El Nino could push this peak into September or October, extending the period of nutrient availability.

BRIN’s website outlines the defining features of upwelling, such as a drop in sea surface temperature, an increase in salinity, and a rise in chlorophyll concentration. These factors collectively signal the upward movement of deep, nutrient-laden water to the surface. This phenomenon is not only crucial for replenishing marine resources but also for maintaining the delicate balance of oceanic ecosystems.

Broader Implications for Indonesian Waters

Beyond the southern regions, BRIN has observed increased productivity in other parts of the archipelago. These include the southeastern Banda Sea, the Arafura Sea, the western Sumatran waters extending into the Andaman Sea, and areas from the Makassar Strait to the Flores Sea. Widodo suggested that the Arafura Sea’s productivity may be linked to the mixing of water masses caused by wind and tidal forces in shallow, exposed regions.

Conversely, certain Indonesian waters remain unaffected by significant upwelling. The Malacca Strait, Karimata Strait, Java Sea, the southern South China Sea, Halmahera Sea, Celebes Sea, and the waters off western Papua to the eastern Philippines are still dominated by relatively warm temperatures and lower chlorophyll levels. These areas may experience upwelling later in the season or under different climatic conditions, such as El Nino.

The upwelling process is a natural cycle that sustains marine life by bringing essential nutrients to the surface. As the deep water rises, it creates an environment where phytoplankton can thrive, supporting a wide range of marine organisms. This cycle is particularly important for fisheries, as it ensures a steady supply of food for species at various trophic levels.

Monitoring and Future Outlook

Widodo emphasized the need for continuous monitoring of upwelling conditions. By tracking its progression, scientists can predict how phytoplankton growth will develop—whether it will be more rapid or widespread. Such insights are critical for fisheries management and climate adaptation strategies, especially in regions where upwelling may intensify due to global climatic shifts.

While the current upwelling signals are promising for marine productivity, they also serve as a reminder of the interconnectedness of oceanic processes. The interplay between temperature, salinity, and nutrient availability not only influences fish populations but also impacts the broader health of the marine environment. BRIN’s ongoing research provides a foundation for understanding these dynamics, enabling more informed decision-making for coastal economies and conservation efforts.

As the climate continues to change, upwelling patterns may shift, presenting both opportunities and challenges. The early signs detected in southern Indonesia underscore the importance of proactive monitoring and adaptive management. By leveraging advanced technologies and regional data, BRIN aims to provide timely insights that help mitigate risks and harness the benefits of this natural phenomenon.

Read more about El Nino’s impact on Indonesia’s climate in the latest updates from Tempo on Google News. Stay informed about how these environmental changes shape the nation’s ecosystems and livelihoods.