India’s Oceansat-3 satellite is providing scientists with a detailed look at changes taking place across the Pacific Ocean as El Nino conditions develop in 2026. Observations from the Indian Space Research Organisation’s EOS-06, commonly known as Oceansat-3, indicate noticeable shifts in ocean biology and surface wind patterns.
Satellite data from June 2026 shows lower concentrations of chlorophyll-a across sections of the central and eastern Pacific compared with observations from the same period in 2024 and 2025. The changes offer scientists a way to examine how evolving climate conditions are affecting both the ocean and the ecosystems that depend on it.
Chlorophyll-a is a pigment found in phytoplankton, microscopic organisms that form the base of marine food chains. Measuring its concentration helps researchers estimate phytoplankton abundance and assess biological activity in seawater. A decline in chlorophyll levels can indicate that fewer phytoplankton are present in a particular region.
The latest Oceansat-3 observations show that parts of the central and eastern Pacific experienced reduced chlorophyll-a levels during June 2026. At the same time, the satellite detected changes in surface winds, providing an indication of how atmospheric circulation and ocean conditions are interacting as El Nino develops.
Under typical Pacific Ocean conditions, trade winds move warm surface water toward the western Pacific. This circulation helps bring colder, nutrient-rich water toward the surface in the eastern Pacific through a process known as upwelling. The nutrients supplied by this process encourage phytoplankton growth and support productive marine ecosystems.
El Nino can interfere with this normal circulation. Changes in wind strength and direction can allow warmer surface water to move farther across the Pacific while weakening the delivery of nutrient-rich deep water to the surface. With fewer nutrients available, phytoplankton productivity can fall, potentially resulting in lower chlorophyll-a concentrations.
Oceansat-3 is equipped to monitor several characteristics of the marine environment, including ocean color and surface winds. This makes it useful for observing large-scale climate events and their effects on ocean ecosystems from space.
The comparison between June observations from 2024, 2025 and 2026 provides scientists with a broader picture of how conditions in the Pacific are changing. The satellite data also highlights how closely atmospheric patterns, ocean circulation and marine life are connected.
As El Nino evolves through 2026, continued observations from Oceansat-3 could help researchers follow its changing influence across the Pacific and better understand its consequences for phytoplankton, fisheries and wider marine food chains.
