A study conducted by MIT and the National Oceanography Center scientists reveals that the ocean’s colour change has undergone significant difference in the past two decades
The findings of the ocean’s colour change indicate a potential link to human-induced climate change.
The ocean’s color has experienced notable shifts in the last 20 years, with approximately 56% of the world’s oceans exhibiting changes that cannot be attributed solely to natural variability.
These alterations, although subtle to the human eye, encompass a larger area than the total landmass on Earth.
Researchers have identified a consistent increase in greenness in tropical ocean regions near the equator. This colour shift suggests that the ecosystems within the surface ocean are also changing, as the ocean’s color reflects the organisms and materials in its waters.
The link to human-induced climate change
While the precise impact of changing ocean color on marine ecosystems remains uncertain, the researchers are confident that human-induced climate change is the underlying driver.
The study’s findings align with simulations that have long predicted such colour changes.
The evidence further underscores the widespread influence of human activities on Earth’s biosphere.
Scientists have traditionally relied on tracking changes in chlorophyll concentrations to detect climate-change-driven alterations in marine ecosystems.
However, recent research indicates that monitoring the entire spectrum of ocean colours, rather than focusing solely on chlorophyll, could provide a more effective means of identifying climate-related trends.
The study utilised seven visible wavelengths measured by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua satellite to capture these subtle color differences.
Unveiling climate change trends through statistical analysis
The team’s statistical analysis of the satellite data over 20 years revealed a clear trend beyond normal year-to-year variations.
Comparing these findings with a climate model from 2019 that accounted for greenhouse gas emissions, the researchers confirmed the consistency between observed changes in ocean color and anthropogenic climate change.
By expanding the analysis of ocean color beyond chlorophyll, scientists can gain quicker insights into climate-driven changes in marine ecosystems.
Understanding these alterations is crucial as they impact plankton communities and influence the carbon absorption capacity of the oceans.
Different types of plankton have varying abilities to capture carbon dioxide, further emphasising the importance of addressing the changing ocean colors.
Implications of changing ocean colour
In conclusion, the study presents compelling evidence that the color of the ocean is changing due to human-induced climate change.
These color shifts serve as a visible indicator of transformations within marine ecosystems, highlighting the need for comprehensive monitoring and actions to mitigate the adverse effects on the planet’s delicate biosphere.
