Tuesday , November 24 2020

The MIT survey warns that the sea will change color due to climate change



Due to climate change, at the end of the century much of the sea will have changed color.

According to a study by the Massachusetts Institute of Technology (MIT) marine phytoplankton, the microscopic algae responsible for the green part of the water has affected its life cycle, composition and distribution, due to climate change.

These organisms They use chlorophyll to synthesize solar energy, thus the green part of the water.

In an article published in nature Communications, the researchers explain has developed a model that simulates growth and interaction between different phytoplankton speciesand how the mixture of species in several places will change as the temperature rises worldwide.

With global warming, the oceans will continue to be bluish or greenish, but with new tonalities. The color change is indicative of a chain of changes in marine life.

The researchers found it By the year 2100, over 50% of the world's oceans will change color due to this climatic phenomenon. These changes will be very subtle, even the human eye is unlikely to see them, but the optical sensors do.

"The changes caused by the heating cause less nutrients to reach the surface layerso it is most likely that phytoplankton will fall into many parts of the ocean, "said Stephanie Dutkiewicz, a MIT researcher and lead author of the study.

According to the researcher, Temperatures also affect how fast phytoplankton grows. He explained that species adapted to hot water grow much faster than others adapted to cold water, and therefore there will be regional changes in the composition, amount and distribution of marine microorganisms that color the water.

"The sea will remain blue. Some regions in the north and south of the equator and the subtropical turns may be more blue. Green becomes more present in polar waters and tropical coastal waters, where phytoplankton provides heat better, "he says.

Scientists also recognize it In order to better match the color of the sea in the future, it will be necessary to include other microscopic components of seawater, such as bacteria, minerals and sea salt.

Sea plants have in addition to sun, nutrients such as nitrogen or phosphorusIf the ocean's turnover is lowered by global warming, these nutrients will not reach the surface.


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