New discovery reveals that ocean algae ‘unexpectedly’ help cool the Earth
Baltic Sea algal bloom [credit: Scitech Daily]
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A compound found in algae can have a significant role in cloud formation, and is said to be ‘a major source of climate-cooling gases’. A study author suggests a ‘need to rethink’ what the climate impacts are.
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A common type of ocean algae plays a significant role in producing a massively abundant compound that helps cool the Earth’s climate, new research has discovered.
The findings of the study by the University of East Anglia (UEA) and Ocean University of China (OUC) could change our understanding of how these tiny marine organisms impact our planet, says Phys.org.
The work appears in Nature Microbiology.
The team identified the bloom-forming Pelagophyceae algae as potentially abundant and important producers of a compound called dimethylsulfoniopropionate, or DMSP.
Co-lead author Professor Jonathan Todd, of UEA’s School of Biological Sciences, said, “The Pelagophyceae are among the most abundant algae on Earth, yet they were not previously known as important producers of DMSP. This discovery is exciting because DMSP is an abundant antistress compound, food source for other microorganisms and major source of climate-cooling gases.”
Dr. Jinyan Wang, OUC/UEA Ph.D. student and first author, said, “Understanding the role of Pelagophyceae in DMSP production means we need to rethink how much of this compound is being produced and how it impacts our climate.”
Every year, billions of tons of DMSP are produced in the Earth’s oceans by marine microorganisms, helping them to survive by protecting against various stresses like changes in salinity, cold, high pressure, and oxidative stress.
Importantly, DMSP is the main source of a climate active gas called dimethylsulfide (DMS), which is known as the smell of the seaside.
This study suggests that DMSP production, and consequently DMS release, is likely higher than previously predicted and emphasizes the key role of microbes in regulating global climate. DMS also acts as a signaling molecule, guiding marine organisms to their food and deterring predators.
When DMS is released into the atmosphere, DMS oxidation products help form clouds which reflect sunlight away from the Earth, effectively cooling the planet.
This natural process is essential for regulating the Earth’s climate and is also hugely important for the global sulfur cycle, representing the main route by which sulfur from the oceans is returned to land.
. . .
The researchers say further study of Pelagophyceae algae in their natural environment is needed, as well as more detailed studies on other marine organisms.
Better measurements of environmental DMSP levels, production and breakdown rates, and the abundance of the enzymes involved in making DMSP are also critical to further advance the field.
Full report here.
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Image: Baltic Sea algal bloom [credit: Scitech Daily]
Source: https://tallbloke.wordpress.com/2024/06/11/new-discovery-reveals-that-ocean-algae-unexpectedly-help-cool-the-earth/
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