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Change in colour of world’s Ocean

 

Source: DTE

 Context: A new study published in Nature reveals that climate change has caused a change in the colour of 56 per cent of the world’s oceans.

  • The study found that waters in the tropics, particularly the southern Indian Ocean, have turned green. Green-coloured water indicates an increase in phytoplankton, microscopic plant-like organisms that are crucial for marine life and carbon dioxide absorption.

Phytoplankton, which are microscopic plant-like organisms that live in the ocean. Phytoplankton contains chlorophyll, a pigment that gives them a green colour. The change in ocean colour is an indicator of alterations in the phytoplankton communities.

The researchers analysed data from the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua satellite, which has been monitoring ocean colour for two decades. They observed long-term trends and used models to simulate scenarios with and without greenhouse gas emissions.