Low nutrient conditions, favoring smaller plankton and altering the composition of the plankton community.
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The change in ocean colour may not directly impact marine life but serves as an important indicator of the marine ecosystem’s state.
It reflects the state of flux in marine ecosystems and the potential risk of going completely out of balance in the future.
How Ocean Colour is Normally Determined
Oceans generally appear blue or navy blue due to the absorption and scattering of light.
When sunlight falls on deep and clear water, longer wavelength parts of the spectrum, such as red, yellow, and green, are absorbed by the water, while shorter wavelength parts, such as blue and violet, are reflected back, leading to the blue colour.
Different colours are observed when water is not clean or deep. For example, dead leaves and sediments can make Atlantic Ocean waters along Argentina’s coastline brownish, while the presence of phytoplankton in the upper surface of water makes it appear green in other parts.
The study’s data on ocean colour has been collected using the MODIS (Moderate Resolution Imaging Spectroradiometer) imaging equipment onboard the Aqua satellite of NASA since 2002.