Saharan dust storms help sustain life in North Atlantic Ocean

Washington, July 19 : A new research carried out by scientists at the University of Liverpool in the UK, has found how Saharan dust storms help sustain life over extensive regions of the North Atlantic Ocean.

Working aboard research vessels in the Atlantic, scientists mapped the distribution of nutrients including phosphorous and nitrogen and investigated how organisms such as phytoplankton are sustained in areas with low nutrient levels.

They found that plants are able to grow in these regions because they are able to take advantage of iron minerals in Saharan dust storms.

This allows them to use organic or 'recycled' material from dead or decaying plants when nutrients such as phosphorous - an essential component of DNA - in the ocean are low.

According to Professor George Wolff, from the University's Department of Earth and Ocean Sciences, "We found that cyanobacteria - a type of ancient phytoplankton - are significant to the understanding of how ocean deserts can support plant growth. Cyanobacteria need nitrogen, phosphorous and iron in order to grow."

"They get nitrogen from the atmosphere, but phosphorous is a highly reactive chemical that is scarce in sea water and is not found in the Earth's atmosphere. Iron is present only in tiny amounts in sea water, even though it is one of the most abundant elements on earth."

"Our findings suggest that Saharan dust storms are largely responsible for the significant difference between the numbers of cyanobacteria in the North and South Atlantic," said Wolff.

"The dust fertilises the North Atlantic and allows phytoplankton to use organic phosphorous, but it doesn't reach the southern regions and so without enough iron, phytoplankton are unable to use the organic material and don't grow as successfully," he added.

According to Professor Ric Williams, co-author of the research, the Atlantic is often referred to as an 'ocean desert' because many nutrients, which are essential in plant life cycles, are either scarce or are only accessible in the darker depths of the ocean.

Plants, however, need some sunlight in order to absorb these important nutrients and so can't always access them from the ocean depths. They therefore need to find the nutrients from elsewhere.

"Now that we are able to show how cyanobacteria make use of organic material, we can understand more clearly how life is sustained in the ocean and why it isn't an 'ocean desert'," said Williams.

"These findings are important because plant life cycles are essential in maintaining the balance of gases in our atmosphere. In looking at how plants survive in this area, we have shown how the Atlantic is able to draw down carbon dioxide from the atmosphere through the growth of photosynthesizing plants," he added.

ANI